Return to 2000: Captain of the Great Powers
Chapter 236 Leave a name in history!The sound shook China!
Chapter 236 Leave a name in history!The sound shook China! (Thanks Xingluan for the rewards!)
In the cockpit of Aircraft 1533, Xu Cang explained to Chen Guoli the plan to change the landing direction.
Originally, the workload of approach preparations was not heavy, so Xu Cang did not wait all the time, but said to himself: "After a while, after descending to [-] feet, maintain the altitude, pass through the field at low altitude, and maintain the flaps at [-] configuration, the landing gear remains retracted. After ascending to an altitude of [-] feet, a slight left turn, followed by a continuous right turn, reversed the landing direction."
While Chen Guoli was doing the work at hand, he was trying to understand what Xu Cang said.
If the sea pressure is corrected to [-] feet, it is about [-] feet from the vertical height of the airport.Under normal circumstances, two hundred feet is the decision altitude for a type of IDS.
However, the terrain of Qitai Airport is complex, and the requirements for the decision height are relatively high, which is directly doubled. The decision height for ILS on runway 28 is [-] feet.
However, although the snow is extremely heavy today and the visibility may be excellent, it is still possible to maintain a visual terrain interval.However, there is one point that Chen Guoli doesn't quite understand: "Since your idea is to fly in the opposite direction along runway 28 first, and then turn around 180 degrees continuously, why don't you stop descending at a higher altitude?"
After all, low-altitude passes have certain risks, and to be honest, Xu Cang’s configuration for low-altitude passes is problematic. How can he not put down the landing gear when the flaps are [-]? This is not to trigger Landing gear configuration warning?
However, Chen Guoli probably understood Xu Cang's intentions.The landing gear is different from the flaps. Although the flaps also increase the drag, they also increase the lift, but the landing gear basically simply increases the drag.
If it is a dual-engine situation, there is naturally no major problem in a high-altitude area like Qitai Airport with landing gear for low-altitude passes.But if you do this with a single engine, it will be a big accident. The plane may not be able to maintain the altitude, especially when the lift is broken down during continuous turns, so you have to lose altitude while turning.The altitude of the plane is very low, how dare to mess up the altitude?
Therefore, instead of descending to a low altitude of more than 200 feet, it is better to maintain a level flight at a higher altitude, for example, stop when there are still a thousand feet above the ground, and maintain a level flight, facing the runway 28. Wouldn't it be safer to fly on all sides and then turn around for landing at a suitable altitude?
In addition, there is another thing in Xu Cang's words that makes Chen Guoli feel puzzled, and that is the final flap issue.
Why Flap Thirty?
"Shouldn't the flaps be used for the landing when it's single-shot?" Chen Guoli asked this question that troubled him.
Xu Cang seemed to have an idea long ago, and he explained it in a leisurely manner: "First of all, there is the problem of descending altitude. Due to the length of one side of runway 10, we must descend to an altitude of more than 1000 feet. You don't have this Objection?"
"That's true." Chen Guoli agreed.
As I said before, one side of runway 10 only extends for six or seven nautical miles, because it faces the main line of Tianshan Mountain, and the mountain in front of it looks like an ax cut down obliquely. It is not straight up and down, but above Slant out a little bit.As a result, when the program reverses back to the side of runway 10, the altitude cannot be too high, otherwise it will be too close to the cliff protrusion.Therefore, it is better to cut in at an altitude of [-] feet above the ground, which is a little more than six nautical miles from the field.
Of course, considering the performance of single-engine climbs, the actual limit altitude at the entry point is [-] feet, which is slightly lower.However, as long as the height is not low, a little higher is harmless.
Chen Guoli agreed with Xu Cang's statement, so the follow-up will make it clear.
"In terms of the standard 28 feet, if we move to the fifth side of runway 28, then we should make a landing direction reversal at five to six nautical miles from runway 28. But runway [-] is five to six nautical miles away. What's below, isn't it more dangerous?"
Now Chen Guoli suddenly understood that there happened to be a hill five to six nautical miles away from runway 28.Previously, when he and the instructor from the National University of China flew over, because the blind landing on runway 28 of Qitai Airport was a little unstable, he artificially increased the descent rate to catch up with the glideslope. of that hill.If the unstable ILS signal suddenly leads them to a big dive near six nautical miles, then the situation is really bad.
As soon as he passed the six sea miles of the mountain, Chen Guoli pressed the APP, that's why.
Xu Cang continued: "In the entire 25 nautical mile area of Qitai Airport, if you want to find the largest continuous leveling area, it is only near the airport. Strictly speaking, even if you turn the direction on the five sides, you can During the turning process, the aircraft will still defer to the final, which is inevitable. However, once it deflects from the final, it is actually out of the terrain protection, so you can only choose a terrain that is as flat as possible, at least I think it is near the airport The terrain is safer than the five sides and six nautical miles. Moreover, due to the radius of the turn, for example, if we choose the turning point at four nautical miles, it is indeed not turning directly above the hill, but the trajectory during the process will cover It’s actually quite dangerous to get there. Therefore, it’s safest to keep the altitude low and keep the entire turning trajectory away from the hills six nautical miles away.”
"I know, I'm worried about the dangers of maneuvering at low altitudes. However, that's a technical issue and I can handle it. If you turn around at six knots or close to six knots, it's a performance issue. I don't feel very good control."
"Besides, due to the single-engine situation, the plane can't climb high. Moreover, Qitai Airport is too close to the main line of Tianshan Mountain. If you want to ensure safety and ease to join the approach procedure of runway 28, the altitude must be at least 800 meters. , with the condition of the aircraft, this is basically impossible."
If the Qitai Airport is not close to the main line of the Tianshan Mountains, but some of the remaining lines, then the 737 feet above can basically guarantee safety.And [-] feet is still achievable for a single-engine [-].The bad thing is that it is close to the main vein, and [-] feet is still very prone to accidents, and it is impossible to get out of the mountainous area.
Since you can't get out of the mountains, you must follow the programmed trajectory.
In a nutshell, high altitudes cannot be climbed, and medium altitudes will encounter hills, so the only option is to turn around at low altitudes to adjust the landing direction.In any case, the location of the airport was the largest place near Tantan at the beginning of the demonstration, and after artificial leveling, it was considered the best place for turning.
Xu Cang thought for a moment: "As for the issue of the flaps. According to the standard operation manual, for example, if there is a single engine on five sides, when the altitude is lower than [-] feet, if there is a single engine, you can keep the landing flaps three. Ten remains unchanged, and continue to land. That means at least in terms of performance, a single-shot landing with flaps [-] is feasible."
"The runway at Qitai Airport is not long enough, the braking distance is not sufficient, and the road is covered with snow. If you land with the flaps fifteen, there is a possibility that the aircraft will not be able to stop."
"Then you can postpone the flaps a little bit, it doesn't have to be so early, what if the performance is not enough?" Chen Guoli tried to land with the flaps [-] on a single engine in the simulator, it is definitely possible, but in practice He hadn't done that on a flight.
Moreover, Xu Cang was still a little worried that he was going to make a big maneuver with the flaps thirty.Therefore, Chen Guoli's idea was to keep the flaps at 28 first, wait for the plane to turn back to runway [-], and finally lower the flaps to [-].
This is relatively easier to accept.
But Xu Cang asked back: "When did you put the flaps thirty? When passing through the field at low altitude? When turning? When the final alignment?"
"Finally." Chen Guoli subconsciously planned to answer, but immediately felt something was wrong.
It will definitely not work when passing through the field at low altitude and turning. These two stages are delicate tasks where the tip of the knife dances, and problems will occur if you are not careful.If the flaps are released at this time, it will undoubtedly change the aerodynamic layout of the aircraft suddenly, and the state of the aircraft will also change accordingly, which will easily disrupt the rhythm of the operator.
After much deliberation, it seems that it is best to put it in the final alignment, at least Chen Guoli thought so before.
But after thinking about it, Xu Cang planned to turn around and adjust the landing direction at a low altitude. Doesn't that mean that the plane basically turned around and was about to land, and there was no room for subsequent adjustments at all.
Because the descent attitude from flap [-] to flap [-] is completely different, and the attitude of the aircraft changes greatly at the initial stage of flap release, and it is necessary to give up slightly if you want to stabilize the descent attitude at flap [-]. The pilot adjusted it.
But because the five sides are too short, there is no room for adjustment.The plane can enter the air above the runway in a not-so-standard situation and land.
When the road surface is in good condition or the runway is long enough, if it’s just for landing, it’s okay to put the flaps before landing.
But here at Qitai, the runway is short and the road surface is still slippery, and the touchdown point is moved back a little, which is a fatal thing.
Moreover, the wind volume at Qitai Airport exceeds the standard, so it is already difficult to operate, but now it is more difficult for Xu Cang, do you really think Xu Cang is a fairy who will not refuse anyone?
Originally, Chen Guoli felt that Xu Cang was not thinking carefully, but now it seems that he himself was not thinking carefully, and he couldn't think deeply at all.However, Chen Guoli could understand Xu Cang's thoughts.
That is, technical problems are probably not the problem, but performance problems are the problem.
As long as the technical problem is operable, then practice it. If you still can't do it, then you have limited ability and you can't blame others.
The problem of performance is different, it is an objective condition.Just like the ceiling of an airplane, it can only climb so high, and it is difficult for anyone to sit in the airplane.
Xu Cang glanced at Chen Guoli, who was deep in thought, and it seemed that he had listened.At this moment, Xu Cang is responsible for controlling the rudder input of the aircraft and monitoring the speed of the aircraft.
Autopilot can't control the rudder input, only the pilot can do it by himself.Moreover, in the case of a single engine, the automatic throttle cannot be used, so the automatic driving and the automatic throttle will not cooperate well, and the speed can only be controlled by the crew.
However, compared to having to start manipulating it by himself, Xu Cang is quite leisurely now.Judging from the current position, until it cuts to the side of runway 10, the middle part is relatively comfortable. Xu Cang just keeps flying on autopilot.But once it reaches the start section on the side of runway 10, it will have to be operated manually.
After more than a minute, Xu Cang could roughly see the Qitai Airport in the front left, and the dark gray tower above it was almost integrated with the cliff behind.If it wasn't for the top of the tower covered with a layer of snow, like wearing a white hat, Xu Cang would have had a hard time finding it.
Moreover, from a distance, most of the airport has been covered with white snow, and it is a vast expanse of whiteness. For a while, it is not clear where is the runway, where is the taxiway, and where is the apron.
"It was covered so soon?" Chen Guoli had already reached an agreement with Xu Cang on the landing method. Of course, he mainly accepted it passively.
Now Chen Guoli is also ready to approach, with his left hand on the steering wheel all the time.Although he is a PM, the strings in his mind are tense.As the saying goes, one who travels a hundred miles is half ninety, so don't make problems when you are close to victory.
Xu Cang looked at the blowing snow outside the windshield, and it melted immediately when it fell on the windshield.If you touch the front two windshields, you can find that the two windshields are warm, but the side windshields are cold.
However, a finger-thick layer of snow and ice has accumulated on the windshield frame, spacers, and windshield wiper arms, which shows that the snow outside is a bit heavy.
"I don't know how thick the snow is on the road here. If it's too thick, it will be troublesome to land later." Chen Guoli muttered.
While speaking, Chen Guoli also noticed the ice and snow on the wiper rocker arm, so he looked behind his left window to see if there was any obvious ice accumulation on the surface of the wing and the leading edge.
However, from the visual point of view, the situation is not bad, but such a large amount of snow can't say when it will freeze.
"Are you going to turn on the wings for anti-icing?" Chen Guoli asked.
"hiss!"
Xu Cang was in a dilemma for a while.Judging from the accumulation of ice and snow on the edge of the windshield frame and other places, it is indeed necessary to turn on the wings for anti-icing.However, the consumption of bleed air for wing anti-icing is too exaggerated, and turning on wing anti-icing at high altitudes can even cause the engine to suddenly shut down.Now the aircraft is a single engine, what if the anti-icing of the wings affects the performance of the engine?
Xu Cang looked back at the condition of his right wing, it was indeed okay, there was no obvious ice accumulation.At this moment, the plane was about to cut across the field, and the plane continued to descend slowly, while the engine speed remained in a relatively small range.
After thinking for a while, Xu Cang thought for a while: "Turn on the wing anti-icing, remove it for a while, and turn off the anti-icing when it cuts to the side of runway 10. Then slow down and lower the flaps."
Xu Cang’s idea is to lower the flaps while the wings are anti-icing. When the flaps are lowered, the speed will be reduced, and the thrust will be reduced. In this way, the workload of the engine will not be too large. It should be fine if the load is added to the wings for anti-icing. .
Otherwise, if you turn on the wing anti-icing under the condition of high thrust of the aircraft, the engine is already running at high intensity, and if you add a wing anti-icing load, you will not be tired?
When the plane slowed down and the flaps were set to about 10, it was almost time to cut into the side of runway 25.After aligning the runway in the later stage, put the flaps at [-], [-], and turn off the wing anti-icing at the same time.
Wing anti-icing has a de-icing function.Now the ice accumulation on the wings is not serious. If it is cleared in a short time, it will not affect the subsequent landing as soon as possible. It is the best of both worlds.
The only thing Xu Cang cared more about was the condition of the runway surface of the airport. Don't let the snow be too thick and it won't fall for a while, then it will be tricky.It was true that the snow was falling too fast, and Xu Cang couldn't tell where the runway was by visual inspection.
He was going to fly towards runway 10 first, but there was no horizontal guidance on runway 10, not even guidance lights.After all, in theory, the fifth side of runway 10 is only five to six nautical miles, which does not meet the design specifications of the instrument program at all.
There is no light, no guidance signal, and the localizer signal of runway 28 does not have the ability to reverse guidance.
However, if a line is extended from the positioning data of the head of runway 10 in the navigation database, it should be roughly maintained in the direction of the runway according to this line.
This positioning data is very accurate, it is uploaded temporarily, and will be deleted later.Unlike a lot of terrain data displayed in the chart, there are deviations.
"I hope I can see where the runway is after going down." Xu Cang thought to himself.
Seen from a high place, the airport is already a vast expanse of whiteness, but it may be seen from a low place.Xu Cang closed the throttle slightly, and when the speed dropped to close to 230 knots, he ordered: "Turn on the wing anti-icing, speed check, flaps one."
Chen Guoli nodded, and after checking the speed, he immediately put the flap handle to the one position, and then turned on the wing anti-icing switch.Previously, Chen Guoli had already closed the cover of the spare flap switch, and the flaps could be deployed normally.
Xu Cang has been watching the airspeed indicator all the time, and with the release of the flaps, retract the accelerator.He kept moving, the speed continued to drop, and then ordered flap five.Chen Guoli naturally followed his advice.
Wait until the flap indicator just reads five and displays a green light.Xu Cang didn't stop for a moment, glanced at the airspeed indicator: "flaps ten!"
"Ten flaps?" Chen Guoli had already put his hand on the flap handle, he was stunned when he heard Xu Cang's order: "Did you mean flap ten?"
Flap ten is an uncommon gear. The flaps of the Boeing 737 have multiple gears such as UP, one, two, five, ten, fifteen, 25, thirty and forty.However, the flaps are not released one by one, there is a jumping sequence.
Generally speaking, take flap 25 in the landing configuration as an example, first put flap [-] first, then skip flap [-], put flap [-], then instead of flap [-], put flap [-], Finally put flap [-] over flap [-].
But if it is a 700 model, after the fifteenth flap, put the flap 25 first, and then put the flap thirty.
Of course, if necessary, after [-] flaps, the crew can lower the flaps to [-] depending on the situation.Because in the standard operating manual, flaps thirty and flaps forty are both conventional landing configurations.
Normal release of the flaps will not use the position of flap ten, only during the standby flap period, after flap five, first put the flap to ten, and then hold it.
The reason for doing this is because the action of extending the flaps [-] times is often tied to the movement of the landing gear, and the speed of the backup flaps is slow. If the flaps are extended [-] times according to the normal process, the aircraft may not be able to The establishment of the landing configuration is completed before the approach altitude is stabilized.
But if you put the flaps fifteen ahead of time, then the landing gear will also be put down at the same time.The landing gear is put down too early, adding drag to the aircraft out of thin air, and it needs to consume extra fuel, which is of course unnecessary.
Therefore, put the flaps at ten first, and shorten the time for the subsequent standby to put the flaps at fifteen, which is the best of both worlds.
Except for this time, Chen Guoli has never seen the flap ten position used at any other time.However, not commonly used does not mean that it is not allowed, and Xu Cang must not violate the regulations if he wants to use flap ten.
"Well, flaps ten. The altitude here is a bit high, we should release the wheels later, we have no chance to go around, it's better to be cautious."
In fact, according to Xu Cang's estimation, if they release their wheels at this altitude now, it's not true that they won't be able to maintain the altitude. After all, the follow-up will basically be a continuous descent rather than a level flight.
However, as Xu Cang said, they have no chance of going back to the plane.Because the approach procedure they are taking now is against the rules. If they fail once, Xu Cang doesn't know where they will go after pulling up, so it's better not to take risks.
Chen Guoli responded, he was just curious, didn't say anything more, and put the flap handle to ten.
Just as Chen Guoli put down the flaps and Xu Cang adjusted the value of the speed window, Bi Lin's voice rang through the radio: "Xu Cang, the snow on this field is serious, and the initial feedback has reached 10mm." .Now the crosswind in this field has already exceeded the standard, and the snow accumulation of [-] mm cannot fall. The grounding end can be cleared within [-] minutes after the response from the field management. Spend some time in the sky. However, pay attention to the circle radius, you put all the flaps down, and try to reduce the turning radius."
"Eighteen millimeters of snow, so thick?" Chen Guoli was stunned, and shouted that it was not good, the thickness of this snow has greatly exceeded the limit.He thought that the surface was covered with a thin layer, why did it add so much at once?
Chen Guoli felt that something was wrong after thinking about it for a while.Bi Lin can also see that only this field is the smoothest in the entire area, so it is the safest to hover and rise in this field. This is basically the same idea as Xu Cang's previous choice of turning at a low altitude to adjust the landing direction.
Chen Guoli does not object to this suggestion. The question is, what happens after the snow on the road is cleared?How does the aircraft rejoin the program?Which program to join?
Just like what Xu Cang said just now, they have no chance to go back to the plane, because once pulled up, they don't know where to go, and there is no corresponding guidance for any procedure they know.
Although the flying method of the plane is wrong now, at least it is following the procedure. Only when it is pulled up and then turned slightly deviates from the procedure, it is really urgent and there is no way.
But if they were changed to circling up on the spot and then circling and waiting at a certain height, then they would not be slightly off, but completely abandon the program.
The runway is ready to land, how can the plane exit the circle and wait?You can't just go in and not go out.
However, no matter what, Xu Cang still had to make up his mind.
Chen Guoli looked at Xu Cang the same way, seeing Xu Cang showing a hint of deep thought, he seemed to have thought of the key point, but he didn't elaborate, just asked: "Xu Cang, what do you say?"
Xu Cang's eyes moved slightly, and he murmured: "[-]mm is too thick, the air volume is too high now, and the runway is still short, it's too risky."
Of course Chen Guoli understands these words, but the problem is after circling: "Exiting later, rejoining the program will be a big trouble."
"Soldiers are coming to block, water is coming to cover, and the snow on the runway is the most urgent. As for the chain problems caused later, I will think about it, and I will think about it." Xu Cang hardly hesitated. Now that he is looking forward and backward, it is better to decide Yes, let the airport clean up the pavement as soon as possible.
Although Chen Guoli felt that it was inappropriate to ignore the series of problems behind in order to deal with the problem of snow on the road, Xu Cang's astonishing no-radius turn before was completely convinced him. Just obey.
"If you don't land for the time being, close the flaps?"
Xu Cang shook his head: "You don't need to close them all, just five flaps."
Xu Cang said, and pressed the speaking button: "If it's [-]mm, it really can't fall. Okay! After I get down to this field, I will circle up again, huh?"
When Xu Cang was speaking, out of the corner of his eye, he saw the EGT display on DU, and he was stunned.I saw that the EGT value of the No. [-] engine, which should have been quite stable, fluctuated extremely frequently, not intermittently, but non-stop.
Chen Guoli also noticed Xu Cang's gaze, and following his gaze, his face suddenly changed: "What's going on?"
After turning around just now, both of them were immersed in great joy, the originally tight thread was loosened after all.Moreover, although the EGT fluctuates a lot, it has never exceeded the limit, so the performance is not obvious, and it is really not easy to find if you don’t pay attention.
"N1 does not seem to change much, only the exhaust temperature is jumping, this is" This kind of EGT instability is most likely to be found when the aircraft is surging, but when the aircraft is surging, the N1 speed should also change accordingly. How can there be EGT? The value is jumping, and N1 is relatively stable.
Xu Cang forgot to go down to the airport on the lower left, and he could vaguely see vehicles gathering towards the runway, and thin indentations appeared on the pure white snow.It can be seen that the action at the airport is very fast.
However, an idea gradually formed in Xu Cang's mind: "No, that's the aftermath of the EEC hard standby mode launched earlier."
In order to ensure that the engine can run normally for a long time, EEC will have overspeed protection for N1 and N2.However, with the operation of the EEC hard standby mode, Xu Cang artificially broke the overspeed protection of the N1, so that he opened the engine restraint.
Granted, this would give the aircraft extra thrust, but the engine was already running wild and out of control.
Chen Guoli understood what Xu Cang was going to say, but he looked at the display on the DU, and suddenly felt a little lucky: "It's okay, it's okay, the EGT fluctuates, but fortunately it's not over the limit, haha."
As soon as the Ha word fell, the EGT value changed again.Previously, the values fluctuated up and down within a stable range.However, as soon as Chen Guoli's voice fell, the EGT value was not only floating, but also slowly increasing, and the peak value of the floating was about to touch the red line.
"Not good!" The smile on Chen Guoli's face didn't last more than three seconds, and he froze all of a sudden: "It's close to exceeding the limit."
"Damn, there is still a problem." Xu Cang was worried about this when he broke through the N1 speed limit through the EEC hard backup, but he didn't expect that the problem appeared when he was about to land: "Dean, it seems that I can't wait for 10 minutes , My No. 5 engine has a problem, and I can’t wait for [-] minutes!”
"What?" In the control room, the faces of Bi Lin and the others suddenly changed. It is impossible to clean up the surface in 5 minutes. What should we do?
"Xu Cang, what happened to the engine?"
Xu Cang didn't hide anything: "The EEC hard standby mode was artificially turned on just now, and the N1 has exceeded the limit."
Wang Li took the microphone from Bi Lin's hand, his eyelids twitched, "What's the biggest N1?"
"It reached 110% for a short time, and it was between 105% and 106% most of the time."
"110%, the instantaneous peak speed of N1 has reached 110%!" Wang Li gritted his teeth. If the engine is not in trouble, then there is a problem.
Wang Li paused: "Xu Cang, what's the situation now?"
"The EGT value of the No. [-] engine is fluctuating, and the peak value is already close to the red line. It seems that the limit will be exceeded soon, and we can't wait any longer."
Bi Lin sternly shouted from the side: "Xu Cang, the No. [-] engine has failed and cannot be saved. Now start the No. [-] engine and terminate the verification!"
However, when these words fell into Xu Cang's ears, he still hesitated: "Dean, what if the next plane encounters a problem similar to the engine overrun caused by the use of EEC? I have to give them a solution, right? "
Hearing this, Zhou Yanping took a deep breath: "Xu Cang, do you really think you're a god? You're going to kill all the thunder, right?"
Just because Xu Cang said this, he was so courageous.The only engine that was still running was about to shut down. In the midst of the mountains, Xu Cang still wanted to verify it, which is really outrageous.
However, Zhou Yanping's perception of danger is different from Xu Cang's perception of danger.The same situation applies to Zhou Yanping. He feels that the verification must be terminated without delay.But although Xu Cang was a little nervous here, it was okay, at least he felt that everything was still under his control, even though the No. [-] engine stopped shortly afterwards.
In the cockpit, Chen Guoli was as tense as Zhou Yanping: "Xu Cang, do you really have to wait?"
"Isn't this still beyond the limit?" Xu Cang's gaze was firmly locked on the airport at the lower left, and everything he saw began to form a holographic image of terrain simulation in his mind. .
To be honest, if they follow the straight-line distance now, even if they turn off both engines immediately, the altitude is definitely enough, even if because of the altitude, the descent here is faster than on the plain.
But the problem is that due to terrain restrictions, the plane cannot fly directly to the field, and needs to fly around the terrain, which increases the flight distance and makes the altitude a bit tense.
However, if it really comes to such a critical point, Xu Cang doesn't mind relying solely on visual conditions to maintain the vertical interval of the terrain.
"You." Chen Guoli was speechless for a moment.
Ordinary pilots would be extremely nervous if they lost one engine, let alone two.But here in Xu Cang, everything seems to be commonplace and simple.
Xu Cang pressed the speaking button: "I think you can try it."
"Try a fart!" Wang Li scolded immediately: "Xu Cang, stop the verification immediately, this is an order."
As soon as Wang Li said that, Bi Lin said: "Xu Cang, you don't need to take this risk. You said that in order to prevent future people from having their engines stalled because of the EEC hard backup, then it's fine not to let them use the EEC hard backup." gone?"
"I understand that your starting point for using the EEC hard reserve is to increase the extra thrust. Your current aircraft has a 24K thrust engine, and the aircraft engines that will perform missions at this airport in the future will be limited to use 26K engines. In this way, latecomers The same thrust effect can be achieved without the use of EEC hard backup. In this way, the risk of over-limit flameout can be minimized. There is no need for you to take risks yourself if you can solve the problem on hardware.”
"Hey, it makes sense." Xu Cang suddenly understood after hearing Bi Lin's words.As Bi Lin said, since the problem of over-limit stalling of the engine can be solved from the hardware, there is really no need for him to take any more risks.
Seeing Xu Cang's agreement, Chen Guoli let out a long breath: "Then I'll make a move?"
"Yeah!" Xu Cang nodded in agreement.
Chen Guoli and Xu Cang are both proficient people, there is no need to do the air start checklist, and the time is not allowed, so Chen Guoli directly does it from memory.
"Let's use cross-bleed air to start." Chen Guoli just looked at the speed and altitude of the plane, and found the starting method from the starting envelope in his memory.
Xu Cang didn't say anything, it was a tacit agreement.
"The left component, turn it off." Seeing that Xu Cang had no objection, Chen Guoli immediately started to move.Then I raised my head, looked at the pipeline pressure gauge, and found that the pipeline pressure was only less than [-]: "Xu Cang, the pipeline pressure is not enough, you can increase the gas pedal."
"Come on?" Xu Cang couldn't help frowning.
Chen Guoli naturally asked for the throttle of the still-running No. [-] engine to be added, which was also required in the checklist.The main reason is that the starting of the engine requires an air source, and now the bleed air from the working No. [-] engine can only be conducted to the No. [-] engine through the isolation valve for its use.
But if the pipeline pressure is too low, the air source for engine starting is insufficient, and the engine starting will most likely not be successful.
But the problem is that the No. [-] engine is already close to overrun, so once the throttle is added, won't it add fuel to the fire?
Chen Guoli didn't notice this problem at first, but when he saw Xu Cang's hesitation, and then he saw the exhaust gas temperature value of the second engine that had almost touched the EGT red line, he immediately understood.
Chen Guoli's face turned pale immediately, isn't this a dead end?
The No. [-] engine needs an air source to start, but the No. [-] engine, which can be used to supply the air source, can’t add too much throttle to provide enough air source because of the overrun problem. What should I do?
"It shouldn't be. Thirty PSI pipe pressure should be easy to achieve. How could it not be achieved?" Xu Cang was suspicious.
Thirty PSI is not a high line pressure standard, and sometimes a working engine can reach it at idle thrust.Of course, under normal circumstances, the speed of the working engine exceeds [-], and the corresponding pipeline pressure can basically be reached.
Now the speed of the No. 55 engine is not high, but it is still about [-], so there is no pipe pressure of [-] PSI.
Hearing Xu Cang's doubtful words, a thought flashed in Chen Guoli's mind: "Is it because of the anti-icing of the wings? It took away a lot of bleed air?"
With wing anti-icing as a big gas consumer, it may be that this thing has robbed the air source of the No. [-] engine, which led to insufficient air source output to the No. [-] engine.
Xu Cang licked his lips: "Closed!"
Chen Guoli didn't dare to be negligent, and immediately turned off the wing anti-ice switches.
When it was closed, Chen Guoli still felt that he had found the crux of the problem.However, after the wing anti-icing was turned off, the pipe pressure only increased slightly, and it still did not meet the requirement of [-] PSI.
"What the hell?" Chen Guoli was about to curse.What kind of thing is this? Xu Cang was finally persuaded to terminate the verification, but there was a problem with the gas source that started the first step. God is going to make trouble?
Chen Guoli immediately wanted Xu Cang to increase the thrust of the No. [-] engine a little, but when he saw the precarious EGT value, he finally gave up this idea.
Whenever Xu Cang dared to put on the gas, the engine would be red within ten seconds.In order to ensure continuous air supply, the accelerator needs to be kept on during the starting process.Chen Guoli didn't think that the No. [-] engine could be started within ten seconds.
"Xu Cang, what should we do now?" Chen Guoli began to panic now.
Although there were many risks before, in any case, although the No. [-] engine was turned off, after all, there was a way to restart it, so I could barely hold my breath.But now that there is no way out, Chen Guoli is unavoidably a little numb.
He is not afraid of death, but it doesn't mean he doesn't want to live.
Xu Cang's face is also not very good-looking, maybe the No. [-] engine's thrust is too small, or it may be that the altitude is relatively high at this moment, and the air is thin, which makes the pipeline pressure lower than usual.
Either way, things are not looking good for them right now.
Seeing that Xu Cang didn't speak, Chen Guoli wanted to ask the control tower for help.However, the plane is still descending slowly at this moment. Judging from the situation displayed on the CDU progress page, the plane is about to land in less than four to five minutes. He must be faster.
"Tower, we are in the process of starting the engine, the pipeline pressure" halfway through, Chen Guoli suddenly had a flash of inspiration, and he ignored the communication, turning his head and said to Xu Cang: "Since the No. How about the APU bleed air? Now the altitude is below [-] feet, no APU power supply is needed, and the APU air source can be used to start the No. [-] engine.”
There are many restrictions on the use of the APU. There are three types of power supply, gas supply, and power + gas supply. At the same time, there will be two additional situations depending on whether it is on the ground or in the air.
If only the air supply is carried out, and if it is in the air, the restricted altitude is [-] feet, which is within the restricted range.
Chen Guoli couldn't help being surprised by his wit, this is definitely a good proposal.However, if Xu Cang thinks it is feasible, he should hurry up. After all, it will take time to start the APU, and then it will take a little time to start the engine. The time is very tight.
The tower was very annoyed by Chen Guoli's half-spoken words, and immediately asked: "What's wrong with the engine starting?"
"It's okay!" Xu Cang replied directly, and then turned to Chen Guoli: "No!"
"Why not?" Chen Guoli was taken aback.
"Double bleed air!" Xu Cang's eyes fell on the isolation valve: "If the APU bleed air is connected, the APU bleed air will recoil into the No. [-] engine, and the ninth-stage high-pressure turbine of the No. [-] engine will bear the brunt. The No. [-] engine is about to stall. Is that what you are going to do?"
How old-fashioned Chen Guoli is, Xu Cang understood with just a few clicks.Due to the existence of the isolation valve, the APU bleed air and the No. [-] engine bleed air are connected, but the two bleed air clashes and repels each other, which is very likely to cause danger.There is even a double bleed air warning light on the panel of the air source system.
However, if the thrust of the number two engine can be limited to idle, then even if there is a problem with double bleed, it will not cause serious problems.But the problem is, if Xu Cang sends the No. [-] engine to the slow train, the plane will basically be in a state of no power, and it will not be able to maintain the correct downward trajectory, but it will enter a desperate state ahead of time.
Chen Guoli felt that his brain was about to stop spinning.This doesn't work, that doesn't work, do we really have to wait for the number two engine to turn off?Now the runway is full of thick snow, and it can't fall, just waiting to die?
However, just when Chen Guoli was on the verge of despair, he suddenly heard a sound of air escaping.Chen Guoli knew what it was, it was the movement of the oxygen mask being squeezed open.
I saw Xu Cang picked up his oxygen mask, and said softly: "Since the bleed air of the No. [-] engine will conflict with the APU bleed air, then turn off the bleed air and components of the No. [-] engine, but this"
"I will release the pressure!" Chen Guoli replied in a daze.
During starting the engine, the components are kept in the closed position.Now that the bleed air of the No. [-] engine is turned off, the bleed air components of the aircraft are completely turned off. If there is any pressurized air, the pressure must be released, so Xu Cang took out the oxygen mask.
"do it!"
Xu Cang put on the oxygen mask, and this action already showed his decision.
Chen Guoli had to marvel at Xu Cang's quick wit.Xu Cang is not only skilled in his hands, but also second to none in his adaptability.But the solution and its side effects came to mind in an instant.
However, there are no passengers in the cabin at the moment, so let’s release the pressure instead of turning off the engines.
Chen Guoli didn't hesitate any longer, and put on the oxygen mask, and at the same time turned the communication panel to the MASK position.Then, without stopping for a moment, he directly shut down the bleed air and right assembly of the No. [-] engine.After that, start the APU.
It takes some time for the APU to start. During this process, Chen Guoli has been paying attention to the EGT value of the No. [-] engine.What made him feel a little happy was that the EGT value of the No. [-] engine did not rise any further after it approached the red line, and it was regarded as stopping the car before the cliff.
However, this does not mean that everything will be all right, it is just the last struggle before dying.
"1533, is the engine started?" Wang Li's voice rang through the radio.
Before, the crew reported that there was a problem with the engine starting, but they were half-spoken, and the people in the control room of the tower did not know the specific situation at all.However, according to the time, if there is no accident, the No. [-] engine should have been started at this time. Wang Li wanted a definite answer.
Chen Guoli didn't think too much about it either: "Our engine started some minor faults, and it's still in the process of starting."
"This voice..." In the tower control room, Zhou Yanping was a little strange when he heard Chen Guoli's reply.He was not surprised by the content of Chen Guoli's words, but by the sound.
This sound is like the feeling of talking with your head in a tank, buzzing.
Wang Li clenched his teeth: "This is the sound only after wearing an oxygen mask. Damn it, what the hell are they doing?"
While waiting for the APU to start, some of the remaining pressurized air in the cabin leaked and soon the cabin altitude warning sounded.
However, this kind of deliberate pressure relief is not necessary to deal with it.Chen Guoli manually cut off the cockpit altitude audio warning and left the matter alone.
Not long after, Xu Cang controlled the plane to cut into the side of runway 10. Looking straight down, he could see some people and vehicles waiting beside the runway on the white snow.
These personnel and vehicles waited for the plane to circle up before entering the runway to clear the snow.
As soon as the plane was on the runway, Xu Cang immediately turned off the autopilot and switched to manual operation. At the same time, he glanced at the start panel of the APU: "Is it still okay?"
Under normal circumstances, the APU should be fine at this time.
"Fast..." Chen Guoli just wanted to say it was fast, but the fault red light on the APU tachometer turned on all of a sudden.Chen Guoli opened his mouth, and his face suddenly turned pale.
"No." Chen Guoli was startled for a moment, then went to retrieve the APU fault maintenance code on the CDU.
It can only be said that Chen Guoli knows a lot. This kind of operation of retrieving maintenance codes is generally only done by the maintenance staff, and almost no pilots can do it. However, Chen Guoli is quite familiar with the operation.
Soon, Chen Guoli called up the maintenance code of the APU, and muttered: "49-101000? Inlet air inlet failure!"
Suddenly, Chen Guoli thought of a possibility.Could it be the ice and snow that blocked the air intake of the APU?With the delicate strength of the APU, this can easily cause a failure to start.
"Xu Xucang, the air intake of the APU is malfunctioning, and it cannot be started!" Chen Guoli said with a trembling voice.
The APU also needs an air source to start. If the air intake fails, no matter how many times you try, it will be in vain.Moreover, the APU bleed air port does not have a deicing function.
Looking at the airport which was still white, Chen Guoli almost despaired.He didn't expect that after the most difficult step, he fell at the door, and he hated it!
Just this time, the plane's altitude was below [-] feet.Xu Cang pulled off the oxygen mask and threw it aside.
"It doesn't matter, I'll take care of it!" After finishing speaking, Xu Cang pressed the call button: "Control tower, keep all the people beside the runway away, I want to land!"
As soon as these words came out, Chen Guoli and the control tower exploded.
Wang Li was the first to roar: "Xu Cang, are you crazy? Eighteen millimeters, no, it's estimated to be more than twenty millimeters now, this can fall, you are looking for death! What happened to the engine, what's wrong with it? "
At this time, even the dullest person in the tower control room can realize that there must be another problem with the plane.Otherwise, Xu Cang will not forcefully land on the ground.
"The No. [-] engine cannot be started." Xu Cang said only one sentence: "I repeat, keep people away from the runway! Otherwise, if something goes wrong, I will not be responsible!"
With such words, Wang Li's face suddenly became gloomy, but after hesitating for a moment, he immediately ordered to the correspondent: "Get the field staff away from the runway quickly!"
Bi Lin stood in front of the window of the control room, watching the plane getting lower and lower, and murmured: "Xu Cang, what are you going to do?"
In the cockpit, Chen Guoli could already feel Xu Cang's unshakable determination to land.However, how could the snow of more than [-] millimeters fall, and the air volume exceeded the standard. This is indeed courting death!
"Xu Cang, are you sure?" Chen Guoli didn't stop Xu Cang at this time, he just wanted to know whether Xu Cang was going crazy or really prepared.
Xu Cang didn't answer directly, but just said lightly: "Fasten your seat belt!"
"Damn it!" Chen Guoli's face changed drastically, and he hurriedly tied up the crotch belt.
At the moment when Chen Guoli fastened his seat belt, Xu Cang suddenly retracted the throttle again, and at the same time slightly pulled the lever, the speed began to drop: "Put the flaps down, until the flaps are thirty!"
"Where's the landing gear?"
"Listen to my password later!"
Chen Guoli gritted his teeth, looked at the decreasing airspeed, first lowered the flaps to fifteen, and then continued until the flaps were lowered to thirty.
When the flap index turned to fifteen, the landing gear configuration warning sounded, and Chen Guoli immediately cut it off manually, and then ignored it.
After all the flaps were lowered, Xu Cang slightly increased the accelerator, and as the plane descended, the situation on the airport gradually became clear.At high altitude, the airport was a vast expanse of whiteness, but at a low level, you can vaguely see the outline of a runway. After all, the snow on the runway was cleared to both sides, which resulted in the thickness of the snow on the runway being slightly thicker than that on both sides. Low, this is what can be distinguished.
At an altitude of two hundred feet, Chen Guoli swallowed, his heart pounding wildly.He knew it was inappropriate for him to speak at this time, but he couldn't help it: "Xu Cang, what are you going to do?"
Xu Cang grinned suddenly, as if he had discovered the most interesting thing: "Teacher, have you ever seen a low-altitude pass?"
"Of course I've seen it before." Chen Guoli was startled: "What do you mean?"
Xu Cang's eyes narrowed slightly, and the corners of his mouth curled up: "I mean a low-altitude pass with a height of one meter!"
Chen Guoli was shocked: "What did you say?"
However, the moment Chen Guoli's voice fell, the plane had already entered the sky above the runway, and when the radio altimeter sounded at [-] feet, Chen Guoli's muscles tensed up.
On the control tower, everyone's breathing seemed to have stopped, and they were all watching intently how Xu Cang landed on the [-]mm thick runway.
Forty feet!
Thirty feet!
Twenty feet!
This series of high-level electronic messages hit Chen Guoli's heart again and again, making him almost breathless.
Suddenly, Chen Guoli heard Xu Cang fully push the accelerator.
Accompanied by the roar of the engine, the plane instinctively descended a little more.
Ten feet!
five feet!
At the moment when the five feet were reported, the plane seemed to be supported by something, and it no longer sank in the slightest.
Chen Guoli's pupils shrank suddenly, and he suddenly discovered that the plane was flying over the runway in a posture close to the ground.But in the vision of the people on the tower, everything is a different scene.
"Snow. It's gone!?"
Zhou Yanping looked at the snow that was swept away where the plane passed, and felt extremely incredible.
Xu Cang, with his usual ultra-low-altitude posture, accompanied by the powerful exhaust jet of the engine, directly blows away the snow accumulated on the road surface. Wherever he passes, the road surface is dark brown.
"Can it still be like this?"
Wang Li never thought that he could complete the snow removal work in this way. This idea is simply unconstrained, and no one can match it.
On the ground, even though the field staff who were already far away from the runway were separated by a long distance, they were still blown to pieces by the strong airflow.But compared to this, they found it even more incredible to see the runway that had been basically cleared.
The scene in front of them really opened the door to a new world for them.
While everyone on the control tower was watching Xu Cang's "Snow Removal" performance in shock, Bi Lin just watched the radar screen silently, and he discovered an even more frightening reality.
That is, after Xu Cang entered the air above the runway, he kept skimming at an ultra-low altitude of three feet above the ground, neither high nor low, just three feet, exactly one meter, exactly, this manipulative ability is simply unbelievable.
You should know that there is ground effect at low altitude, which will affect the pilot's control.If it is too far from the ground, the exhaust jet of the engine will not be very effective in removing snow.But it's too close, and it's easy to hit the ground. It's so difficult to grasp, it's unimaginable.
Looking at the passing road, Chen Guoli felt his mind went blank. He felt as if he was not sitting on a plane, but a very stable car driving on the road.
"This is his strength?"
The moment Chen Guoli asked this question, he lowered his head slightly, and suddenly found that the EGT indicator of the No. [-] engine had exceeded the limit and turned into a red display.
No wonder, in order to maintain a low-altitude pass, Xu Cang increased the gas pedal, the engine was already close to overrun, how could it hold on now?
"Xu Cang, you're speeding!" Chen Guoli shouted.
When Xu Cang was passing through the field at low altitude, he stepped on the accelerator but didn't take it back.Because Xu Cang knows that if this is added, the engine must be useless, and it doesn't matter whether it is recovered or not. It is better to accumulate more energy for the aircraft, and its performance is the increase in speed.
However, with the accelerator on full throttle and the stick on the stick, the speed of the plane increased all of a sudden, exceeding the speed limit of [-] flaps.
"Flaps offloaded!"
"No matter!" Xu Cang shouted coldly.
At this moment, as soon as the plane passed the end of the runway, the dying engine gasped twice, finally ushering in the end of its life.However, at the time of its fall, its last effort has been made.
At this moment, Xu Cang slammed the lever, turned slightly to the left, and shouted at the same time: "Put down the landing gear!"
Chen Guoli was stunned for a moment, gritted his teeth, and put down the landing gear handle without caring about anything else.
As soon as Chen Guoli finished his movements, Xu Cang turned left for only a moment and immediately leveled off the slope, then turned right continuously at full slope, and at the same time took the pole backward.
Although the landing gear basically produces resistance, at the beginning of lowering the landing gear, due to the influence of the center of gravity brought about by its release, the aircraft will instead raise its head briefly, as if a drowning person is struggling to get out of the water.
It was such a fleeting energy that caused the plane to rise slightly, as if a dying person breathed a sigh of relief.What's more, the high speed brought by Xu Cang's accelerator pedal played a role.
Xu Cang always carried the stick to prevent the plane from falling down during the turning process.At this time, there is only one reason why the plane can not fall down, that is, there is still speed.
Altitude is speed, speed is altitude!
The high speed accumulated before has become the weight to maintain the height!
Xu Cang's turning action was quite decisive, turning with a slope of more than [-] degrees.After a while, Chen Guoli could already see the runway from the side.However, the moment his gaze caught his eye, he was taken aback.
There is still a vast expanse of whiteness, and some have only a dark brown, no snow-colored regular runway.
"This..." Chen Guoli was in charge, and for a moment he didn't understand what happened.
When Xu Cang saw all this, his eyes burst into light, he maintained the slope, and continued to turn.
Just when the three indicator lights of the landing gear all turned green, the nose of the plane was aligned with the runway.
Because Xu Cang's turning timing was extremely early, the plane had already reached the sky above the runway almost at the moment when he was facing the runway.At this moment, the speed of the plane was close to shaking the stick, Xu Cang could no longer continue to bring it back, so he had to lower it slightly, but not more, otherwise the front wheels would touch the ground first, and the consequences would be disastrous.
Anyway, the speed of the plane was also low, and the energy was also low, even Xu Cang could do nothing, he put his left hand directly from the thrust handle, and immediately lowered the flaps from [-] to [-].
With the initial lift generated by the continued lowering of the flaps, the sinking that was about to get out of control was slightly offset.However, after only such an instant of slowing down, the plane finally smashed hard on the runway, as if the whole plane was about to fall apart.
As soon as the plane landed, Xu Cang pulled up the speed brake almost instinctively, and pushed the steering wheel forward to the bottom at the same time.And Chen Guoli, who was beside him, after a short period of absent-mindedness, broke out the most exciting roar: "We... survived!"
I didn't expect to write so much.
Thank you Xingluan i for the rewards, I haven't received the rewards for a long time, so I'm smiling.
(End of this chapter)
In the cockpit of Aircraft 1533, Xu Cang explained to Chen Guoli the plan to change the landing direction.
Originally, the workload of approach preparations was not heavy, so Xu Cang did not wait all the time, but said to himself: "After a while, after descending to [-] feet, maintain the altitude, pass through the field at low altitude, and maintain the flaps at [-] configuration, the landing gear remains retracted. After ascending to an altitude of [-] feet, a slight left turn, followed by a continuous right turn, reversed the landing direction."
While Chen Guoli was doing the work at hand, he was trying to understand what Xu Cang said.
If the sea pressure is corrected to [-] feet, it is about [-] feet from the vertical height of the airport.Under normal circumstances, two hundred feet is the decision altitude for a type of IDS.
However, the terrain of Qitai Airport is complex, and the requirements for the decision height are relatively high, which is directly doubled. The decision height for ILS on runway 28 is [-] feet.
However, although the snow is extremely heavy today and the visibility may be excellent, it is still possible to maintain a visual terrain interval.However, there is one point that Chen Guoli doesn't quite understand: "Since your idea is to fly in the opposite direction along runway 28 first, and then turn around 180 degrees continuously, why don't you stop descending at a higher altitude?"
After all, low-altitude passes have certain risks, and to be honest, Xu Cang’s configuration for low-altitude passes is problematic. How can he not put down the landing gear when the flaps are [-]? This is not to trigger Landing gear configuration warning?
However, Chen Guoli probably understood Xu Cang's intentions.The landing gear is different from the flaps. Although the flaps also increase the drag, they also increase the lift, but the landing gear basically simply increases the drag.
If it is a dual-engine situation, there is naturally no major problem in a high-altitude area like Qitai Airport with landing gear for low-altitude passes.But if you do this with a single engine, it will be a big accident. The plane may not be able to maintain the altitude, especially when the lift is broken down during continuous turns, so you have to lose altitude while turning.The altitude of the plane is very low, how dare to mess up the altitude?
Therefore, instead of descending to a low altitude of more than 200 feet, it is better to maintain a level flight at a higher altitude, for example, stop when there are still a thousand feet above the ground, and maintain a level flight, facing the runway 28. Wouldn't it be safer to fly on all sides and then turn around for landing at a suitable altitude?
In addition, there is another thing in Xu Cang's words that makes Chen Guoli feel puzzled, and that is the final flap issue.
Why Flap Thirty?
"Shouldn't the flaps be used for the landing when it's single-shot?" Chen Guoli asked this question that troubled him.
Xu Cang seemed to have an idea long ago, and he explained it in a leisurely manner: "First of all, there is the problem of descending altitude. Due to the length of one side of runway 10, we must descend to an altitude of more than 1000 feet. You don't have this Objection?"
"That's true." Chen Guoli agreed.
As I said before, one side of runway 10 only extends for six or seven nautical miles, because it faces the main line of Tianshan Mountain, and the mountain in front of it looks like an ax cut down obliquely. It is not straight up and down, but above Slant out a little bit.As a result, when the program reverses back to the side of runway 10, the altitude cannot be too high, otherwise it will be too close to the cliff protrusion.Therefore, it is better to cut in at an altitude of [-] feet above the ground, which is a little more than six nautical miles from the field.
Of course, considering the performance of single-engine climbs, the actual limit altitude at the entry point is [-] feet, which is slightly lower.However, as long as the height is not low, a little higher is harmless.
Chen Guoli agreed with Xu Cang's statement, so the follow-up will make it clear.
"In terms of the standard 28 feet, if we move to the fifth side of runway 28, then we should make a landing direction reversal at five to six nautical miles from runway 28. But runway [-] is five to six nautical miles away. What's below, isn't it more dangerous?"
Now Chen Guoli suddenly understood that there happened to be a hill five to six nautical miles away from runway 28.Previously, when he and the instructor from the National University of China flew over, because the blind landing on runway 28 of Qitai Airport was a little unstable, he artificially increased the descent rate to catch up with the glideslope. of that hill.If the unstable ILS signal suddenly leads them to a big dive near six nautical miles, then the situation is really bad.
As soon as he passed the six sea miles of the mountain, Chen Guoli pressed the APP, that's why.
Xu Cang continued: "In the entire 25 nautical mile area of Qitai Airport, if you want to find the largest continuous leveling area, it is only near the airport. Strictly speaking, even if you turn the direction on the five sides, you can During the turning process, the aircraft will still defer to the final, which is inevitable. However, once it deflects from the final, it is actually out of the terrain protection, so you can only choose a terrain that is as flat as possible, at least I think it is near the airport The terrain is safer than the five sides and six nautical miles. Moreover, due to the radius of the turn, for example, if we choose the turning point at four nautical miles, it is indeed not turning directly above the hill, but the trajectory during the process will cover It’s actually quite dangerous to get there. Therefore, it’s safest to keep the altitude low and keep the entire turning trajectory away from the hills six nautical miles away.”
"I know, I'm worried about the dangers of maneuvering at low altitudes. However, that's a technical issue and I can handle it. If you turn around at six knots or close to six knots, it's a performance issue. I don't feel very good control."
"Besides, due to the single-engine situation, the plane can't climb high. Moreover, Qitai Airport is too close to the main line of Tianshan Mountain. If you want to ensure safety and ease to join the approach procedure of runway 28, the altitude must be at least 800 meters. , with the condition of the aircraft, this is basically impossible."
If the Qitai Airport is not close to the main line of the Tianshan Mountains, but some of the remaining lines, then the 737 feet above can basically guarantee safety.And [-] feet is still achievable for a single-engine [-].The bad thing is that it is close to the main vein, and [-] feet is still very prone to accidents, and it is impossible to get out of the mountainous area.
Since you can't get out of the mountains, you must follow the programmed trajectory.
In a nutshell, high altitudes cannot be climbed, and medium altitudes will encounter hills, so the only option is to turn around at low altitudes to adjust the landing direction.In any case, the location of the airport was the largest place near Tantan at the beginning of the demonstration, and after artificial leveling, it was considered the best place for turning.
Xu Cang thought for a moment: "As for the issue of the flaps. According to the standard operation manual, for example, if there is a single engine on five sides, when the altitude is lower than [-] feet, if there is a single engine, you can keep the landing flaps three. Ten remains unchanged, and continue to land. That means at least in terms of performance, a single-shot landing with flaps [-] is feasible."
"The runway at Qitai Airport is not long enough, the braking distance is not sufficient, and the road is covered with snow. If you land with the flaps fifteen, there is a possibility that the aircraft will not be able to stop."
"Then you can postpone the flaps a little bit, it doesn't have to be so early, what if the performance is not enough?" Chen Guoli tried to land with the flaps [-] on a single engine in the simulator, it is definitely possible, but in practice He hadn't done that on a flight.
Moreover, Xu Cang was still a little worried that he was going to make a big maneuver with the flaps thirty.Therefore, Chen Guoli's idea was to keep the flaps at 28 first, wait for the plane to turn back to runway [-], and finally lower the flaps to [-].
This is relatively easier to accept.
But Xu Cang asked back: "When did you put the flaps thirty? When passing through the field at low altitude? When turning? When the final alignment?"
"Finally." Chen Guoli subconsciously planned to answer, but immediately felt something was wrong.
It will definitely not work when passing through the field at low altitude and turning. These two stages are delicate tasks where the tip of the knife dances, and problems will occur if you are not careful.If the flaps are released at this time, it will undoubtedly change the aerodynamic layout of the aircraft suddenly, and the state of the aircraft will also change accordingly, which will easily disrupt the rhythm of the operator.
After much deliberation, it seems that it is best to put it in the final alignment, at least Chen Guoli thought so before.
But after thinking about it, Xu Cang planned to turn around and adjust the landing direction at a low altitude. Doesn't that mean that the plane basically turned around and was about to land, and there was no room for subsequent adjustments at all.
Because the descent attitude from flap [-] to flap [-] is completely different, and the attitude of the aircraft changes greatly at the initial stage of flap release, and it is necessary to give up slightly if you want to stabilize the descent attitude at flap [-]. The pilot adjusted it.
But because the five sides are too short, there is no room for adjustment.The plane can enter the air above the runway in a not-so-standard situation and land.
When the road surface is in good condition or the runway is long enough, if it’s just for landing, it’s okay to put the flaps before landing.
But here at Qitai, the runway is short and the road surface is still slippery, and the touchdown point is moved back a little, which is a fatal thing.
Moreover, the wind volume at Qitai Airport exceeds the standard, so it is already difficult to operate, but now it is more difficult for Xu Cang, do you really think Xu Cang is a fairy who will not refuse anyone?
Originally, Chen Guoli felt that Xu Cang was not thinking carefully, but now it seems that he himself was not thinking carefully, and he couldn't think deeply at all.However, Chen Guoli could understand Xu Cang's thoughts.
That is, technical problems are probably not the problem, but performance problems are the problem.
As long as the technical problem is operable, then practice it. If you still can't do it, then you have limited ability and you can't blame others.
The problem of performance is different, it is an objective condition.Just like the ceiling of an airplane, it can only climb so high, and it is difficult for anyone to sit in the airplane.
Xu Cang glanced at Chen Guoli, who was deep in thought, and it seemed that he had listened.At this moment, Xu Cang is responsible for controlling the rudder input of the aircraft and monitoring the speed of the aircraft.
Autopilot can't control the rudder input, only the pilot can do it by himself.Moreover, in the case of a single engine, the automatic throttle cannot be used, so the automatic driving and the automatic throttle will not cooperate well, and the speed can only be controlled by the crew.
However, compared to having to start manipulating it by himself, Xu Cang is quite leisurely now.Judging from the current position, until it cuts to the side of runway 10, the middle part is relatively comfortable. Xu Cang just keeps flying on autopilot.But once it reaches the start section on the side of runway 10, it will have to be operated manually.
After more than a minute, Xu Cang could roughly see the Qitai Airport in the front left, and the dark gray tower above it was almost integrated with the cliff behind.If it wasn't for the top of the tower covered with a layer of snow, like wearing a white hat, Xu Cang would have had a hard time finding it.
Moreover, from a distance, most of the airport has been covered with white snow, and it is a vast expanse of whiteness. For a while, it is not clear where is the runway, where is the taxiway, and where is the apron.
"It was covered so soon?" Chen Guoli had already reached an agreement with Xu Cang on the landing method. Of course, he mainly accepted it passively.
Now Chen Guoli is also ready to approach, with his left hand on the steering wheel all the time.Although he is a PM, the strings in his mind are tense.As the saying goes, one who travels a hundred miles is half ninety, so don't make problems when you are close to victory.
Xu Cang looked at the blowing snow outside the windshield, and it melted immediately when it fell on the windshield.If you touch the front two windshields, you can find that the two windshields are warm, but the side windshields are cold.
However, a finger-thick layer of snow and ice has accumulated on the windshield frame, spacers, and windshield wiper arms, which shows that the snow outside is a bit heavy.
"I don't know how thick the snow is on the road here. If it's too thick, it will be troublesome to land later." Chen Guoli muttered.
While speaking, Chen Guoli also noticed the ice and snow on the wiper rocker arm, so he looked behind his left window to see if there was any obvious ice accumulation on the surface of the wing and the leading edge.
However, from the visual point of view, the situation is not bad, but such a large amount of snow can't say when it will freeze.
"Are you going to turn on the wings for anti-icing?" Chen Guoli asked.
"hiss!"
Xu Cang was in a dilemma for a while.Judging from the accumulation of ice and snow on the edge of the windshield frame and other places, it is indeed necessary to turn on the wings for anti-icing.However, the consumption of bleed air for wing anti-icing is too exaggerated, and turning on wing anti-icing at high altitudes can even cause the engine to suddenly shut down.Now the aircraft is a single engine, what if the anti-icing of the wings affects the performance of the engine?
Xu Cang looked back at the condition of his right wing, it was indeed okay, there was no obvious ice accumulation.At this moment, the plane was about to cut across the field, and the plane continued to descend slowly, while the engine speed remained in a relatively small range.
After thinking for a while, Xu Cang thought for a while: "Turn on the wing anti-icing, remove it for a while, and turn off the anti-icing when it cuts to the side of runway 10. Then slow down and lower the flaps."
Xu Cang’s idea is to lower the flaps while the wings are anti-icing. When the flaps are lowered, the speed will be reduced, and the thrust will be reduced. In this way, the workload of the engine will not be too large. It should be fine if the load is added to the wings for anti-icing. .
Otherwise, if you turn on the wing anti-icing under the condition of high thrust of the aircraft, the engine is already running at high intensity, and if you add a wing anti-icing load, you will not be tired?
When the plane slowed down and the flaps were set to about 10, it was almost time to cut into the side of runway 25.After aligning the runway in the later stage, put the flaps at [-], [-], and turn off the wing anti-icing at the same time.
Wing anti-icing has a de-icing function.Now the ice accumulation on the wings is not serious. If it is cleared in a short time, it will not affect the subsequent landing as soon as possible. It is the best of both worlds.
The only thing Xu Cang cared more about was the condition of the runway surface of the airport. Don't let the snow be too thick and it won't fall for a while, then it will be tricky.It was true that the snow was falling too fast, and Xu Cang couldn't tell where the runway was by visual inspection.
He was going to fly towards runway 10 first, but there was no horizontal guidance on runway 10, not even guidance lights.After all, in theory, the fifth side of runway 10 is only five to six nautical miles, which does not meet the design specifications of the instrument program at all.
There is no light, no guidance signal, and the localizer signal of runway 28 does not have the ability to reverse guidance.
However, if a line is extended from the positioning data of the head of runway 10 in the navigation database, it should be roughly maintained in the direction of the runway according to this line.
This positioning data is very accurate, it is uploaded temporarily, and will be deleted later.Unlike a lot of terrain data displayed in the chart, there are deviations.
"I hope I can see where the runway is after going down." Xu Cang thought to himself.
Seen from a high place, the airport is already a vast expanse of whiteness, but it may be seen from a low place.Xu Cang closed the throttle slightly, and when the speed dropped to close to 230 knots, he ordered: "Turn on the wing anti-icing, speed check, flaps one."
Chen Guoli nodded, and after checking the speed, he immediately put the flap handle to the one position, and then turned on the wing anti-icing switch.Previously, Chen Guoli had already closed the cover of the spare flap switch, and the flaps could be deployed normally.
Xu Cang has been watching the airspeed indicator all the time, and with the release of the flaps, retract the accelerator.He kept moving, the speed continued to drop, and then ordered flap five.Chen Guoli naturally followed his advice.
Wait until the flap indicator just reads five and displays a green light.Xu Cang didn't stop for a moment, glanced at the airspeed indicator: "flaps ten!"
"Ten flaps?" Chen Guoli had already put his hand on the flap handle, he was stunned when he heard Xu Cang's order: "Did you mean flap ten?"
Flap ten is an uncommon gear. The flaps of the Boeing 737 have multiple gears such as UP, one, two, five, ten, fifteen, 25, thirty and forty.However, the flaps are not released one by one, there is a jumping sequence.
Generally speaking, take flap 25 in the landing configuration as an example, first put flap [-] first, then skip flap [-], put flap [-], then instead of flap [-], put flap [-], Finally put flap [-] over flap [-].
But if it is a 700 model, after the fifteenth flap, put the flap 25 first, and then put the flap thirty.
Of course, if necessary, after [-] flaps, the crew can lower the flaps to [-] depending on the situation.Because in the standard operating manual, flaps thirty and flaps forty are both conventional landing configurations.
Normal release of the flaps will not use the position of flap ten, only during the standby flap period, after flap five, first put the flap to ten, and then hold it.
The reason for doing this is because the action of extending the flaps [-] times is often tied to the movement of the landing gear, and the speed of the backup flaps is slow. If the flaps are extended [-] times according to the normal process, the aircraft may not be able to The establishment of the landing configuration is completed before the approach altitude is stabilized.
But if you put the flaps fifteen ahead of time, then the landing gear will also be put down at the same time.The landing gear is put down too early, adding drag to the aircraft out of thin air, and it needs to consume extra fuel, which is of course unnecessary.
Therefore, put the flaps at ten first, and shorten the time for the subsequent standby to put the flaps at fifteen, which is the best of both worlds.
Except for this time, Chen Guoli has never seen the flap ten position used at any other time.However, not commonly used does not mean that it is not allowed, and Xu Cang must not violate the regulations if he wants to use flap ten.
"Well, flaps ten. The altitude here is a bit high, we should release the wheels later, we have no chance to go around, it's better to be cautious."
In fact, according to Xu Cang's estimation, if they release their wheels at this altitude now, it's not true that they won't be able to maintain the altitude. After all, the follow-up will basically be a continuous descent rather than a level flight.
However, as Xu Cang said, they have no chance of going back to the plane.Because the approach procedure they are taking now is against the rules. If they fail once, Xu Cang doesn't know where they will go after pulling up, so it's better not to take risks.
Chen Guoli responded, he was just curious, didn't say anything more, and put the flap handle to ten.
Just as Chen Guoli put down the flaps and Xu Cang adjusted the value of the speed window, Bi Lin's voice rang through the radio: "Xu Cang, the snow on this field is serious, and the initial feedback has reached 10mm." .Now the crosswind in this field has already exceeded the standard, and the snow accumulation of [-] mm cannot fall. The grounding end can be cleared within [-] minutes after the response from the field management. Spend some time in the sky. However, pay attention to the circle radius, you put all the flaps down, and try to reduce the turning radius."
"Eighteen millimeters of snow, so thick?" Chen Guoli was stunned, and shouted that it was not good, the thickness of this snow has greatly exceeded the limit.He thought that the surface was covered with a thin layer, why did it add so much at once?
Chen Guoli felt that something was wrong after thinking about it for a while.Bi Lin can also see that only this field is the smoothest in the entire area, so it is the safest to hover and rise in this field. This is basically the same idea as Xu Cang's previous choice of turning at a low altitude to adjust the landing direction.
Chen Guoli does not object to this suggestion. The question is, what happens after the snow on the road is cleared?How does the aircraft rejoin the program?Which program to join?
Just like what Xu Cang said just now, they have no chance to go back to the plane, because once pulled up, they don't know where to go, and there is no corresponding guidance for any procedure they know.
Although the flying method of the plane is wrong now, at least it is following the procedure. Only when it is pulled up and then turned slightly deviates from the procedure, it is really urgent and there is no way.
But if they were changed to circling up on the spot and then circling and waiting at a certain height, then they would not be slightly off, but completely abandon the program.
The runway is ready to land, how can the plane exit the circle and wait?You can't just go in and not go out.
However, no matter what, Xu Cang still had to make up his mind.
Chen Guoli looked at Xu Cang the same way, seeing Xu Cang showing a hint of deep thought, he seemed to have thought of the key point, but he didn't elaborate, just asked: "Xu Cang, what do you say?"
Xu Cang's eyes moved slightly, and he murmured: "[-]mm is too thick, the air volume is too high now, and the runway is still short, it's too risky."
Of course Chen Guoli understands these words, but the problem is after circling: "Exiting later, rejoining the program will be a big trouble."
"Soldiers are coming to block, water is coming to cover, and the snow on the runway is the most urgent. As for the chain problems caused later, I will think about it, and I will think about it." Xu Cang hardly hesitated. Now that he is looking forward and backward, it is better to decide Yes, let the airport clean up the pavement as soon as possible.
Although Chen Guoli felt that it was inappropriate to ignore the series of problems behind in order to deal with the problem of snow on the road, Xu Cang's astonishing no-radius turn before was completely convinced him. Just obey.
"If you don't land for the time being, close the flaps?"
Xu Cang shook his head: "You don't need to close them all, just five flaps."
Xu Cang said, and pressed the speaking button: "If it's [-]mm, it really can't fall. Okay! After I get down to this field, I will circle up again, huh?"
When Xu Cang was speaking, out of the corner of his eye, he saw the EGT display on DU, and he was stunned.I saw that the EGT value of the No. [-] engine, which should have been quite stable, fluctuated extremely frequently, not intermittently, but non-stop.
Chen Guoli also noticed Xu Cang's gaze, and following his gaze, his face suddenly changed: "What's going on?"
After turning around just now, both of them were immersed in great joy, the originally tight thread was loosened after all.Moreover, although the EGT fluctuates a lot, it has never exceeded the limit, so the performance is not obvious, and it is really not easy to find if you don’t pay attention.
"N1 does not seem to change much, only the exhaust temperature is jumping, this is" This kind of EGT instability is most likely to be found when the aircraft is surging, but when the aircraft is surging, the N1 speed should also change accordingly. How can there be EGT? The value is jumping, and N1 is relatively stable.
Xu Cang forgot to go down to the airport on the lower left, and he could vaguely see vehicles gathering towards the runway, and thin indentations appeared on the pure white snow.It can be seen that the action at the airport is very fast.
However, an idea gradually formed in Xu Cang's mind: "No, that's the aftermath of the EEC hard standby mode launched earlier."
In order to ensure that the engine can run normally for a long time, EEC will have overspeed protection for N1 and N2.However, with the operation of the EEC hard standby mode, Xu Cang artificially broke the overspeed protection of the N1, so that he opened the engine restraint.
Granted, this would give the aircraft extra thrust, but the engine was already running wild and out of control.
Chen Guoli understood what Xu Cang was going to say, but he looked at the display on the DU, and suddenly felt a little lucky: "It's okay, it's okay, the EGT fluctuates, but fortunately it's not over the limit, haha."
As soon as the Ha word fell, the EGT value changed again.Previously, the values fluctuated up and down within a stable range.However, as soon as Chen Guoli's voice fell, the EGT value was not only floating, but also slowly increasing, and the peak value of the floating was about to touch the red line.
"Not good!" The smile on Chen Guoli's face didn't last more than three seconds, and he froze all of a sudden: "It's close to exceeding the limit."
"Damn, there is still a problem." Xu Cang was worried about this when he broke through the N1 speed limit through the EEC hard backup, but he didn't expect that the problem appeared when he was about to land: "Dean, it seems that I can't wait for 10 minutes , My No. 5 engine has a problem, and I can’t wait for [-] minutes!”
"What?" In the control room, the faces of Bi Lin and the others suddenly changed. It is impossible to clean up the surface in 5 minutes. What should we do?
"Xu Cang, what happened to the engine?"
Xu Cang didn't hide anything: "The EEC hard standby mode was artificially turned on just now, and the N1 has exceeded the limit."
Wang Li took the microphone from Bi Lin's hand, his eyelids twitched, "What's the biggest N1?"
"It reached 110% for a short time, and it was between 105% and 106% most of the time."
"110%, the instantaneous peak speed of N1 has reached 110%!" Wang Li gritted his teeth. If the engine is not in trouble, then there is a problem.
Wang Li paused: "Xu Cang, what's the situation now?"
"The EGT value of the No. [-] engine is fluctuating, and the peak value is already close to the red line. It seems that the limit will be exceeded soon, and we can't wait any longer."
Bi Lin sternly shouted from the side: "Xu Cang, the No. [-] engine has failed and cannot be saved. Now start the No. [-] engine and terminate the verification!"
However, when these words fell into Xu Cang's ears, he still hesitated: "Dean, what if the next plane encounters a problem similar to the engine overrun caused by the use of EEC? I have to give them a solution, right? "
Hearing this, Zhou Yanping took a deep breath: "Xu Cang, do you really think you're a god? You're going to kill all the thunder, right?"
Just because Xu Cang said this, he was so courageous.The only engine that was still running was about to shut down. In the midst of the mountains, Xu Cang still wanted to verify it, which is really outrageous.
However, Zhou Yanping's perception of danger is different from Xu Cang's perception of danger.The same situation applies to Zhou Yanping. He feels that the verification must be terminated without delay.But although Xu Cang was a little nervous here, it was okay, at least he felt that everything was still under his control, even though the No. [-] engine stopped shortly afterwards.
In the cockpit, Chen Guoli was as tense as Zhou Yanping: "Xu Cang, do you really have to wait?"
"Isn't this still beyond the limit?" Xu Cang's gaze was firmly locked on the airport at the lower left, and everything he saw began to form a holographic image of terrain simulation in his mind. .
To be honest, if they follow the straight-line distance now, even if they turn off both engines immediately, the altitude is definitely enough, even if because of the altitude, the descent here is faster than on the plain.
But the problem is that due to terrain restrictions, the plane cannot fly directly to the field, and needs to fly around the terrain, which increases the flight distance and makes the altitude a bit tense.
However, if it really comes to such a critical point, Xu Cang doesn't mind relying solely on visual conditions to maintain the vertical interval of the terrain.
"You." Chen Guoli was speechless for a moment.
Ordinary pilots would be extremely nervous if they lost one engine, let alone two.But here in Xu Cang, everything seems to be commonplace and simple.
Xu Cang pressed the speaking button: "I think you can try it."
"Try a fart!" Wang Li scolded immediately: "Xu Cang, stop the verification immediately, this is an order."
As soon as Wang Li said that, Bi Lin said: "Xu Cang, you don't need to take this risk. You said that in order to prevent future people from having their engines stalled because of the EEC hard backup, then it's fine not to let them use the EEC hard backup." gone?"
"I understand that your starting point for using the EEC hard reserve is to increase the extra thrust. Your current aircraft has a 24K thrust engine, and the aircraft engines that will perform missions at this airport in the future will be limited to use 26K engines. In this way, latecomers The same thrust effect can be achieved without the use of EEC hard backup. In this way, the risk of over-limit flameout can be minimized. There is no need for you to take risks yourself if you can solve the problem on hardware.”
"Hey, it makes sense." Xu Cang suddenly understood after hearing Bi Lin's words.As Bi Lin said, since the problem of over-limit stalling of the engine can be solved from the hardware, there is really no need for him to take any more risks.
Seeing Xu Cang's agreement, Chen Guoli let out a long breath: "Then I'll make a move?"
"Yeah!" Xu Cang nodded in agreement.
Chen Guoli and Xu Cang are both proficient people, there is no need to do the air start checklist, and the time is not allowed, so Chen Guoli directly does it from memory.
"Let's use cross-bleed air to start." Chen Guoli just looked at the speed and altitude of the plane, and found the starting method from the starting envelope in his memory.
Xu Cang didn't say anything, it was a tacit agreement.
"The left component, turn it off." Seeing that Xu Cang had no objection, Chen Guoli immediately started to move.Then I raised my head, looked at the pipeline pressure gauge, and found that the pipeline pressure was only less than [-]: "Xu Cang, the pipeline pressure is not enough, you can increase the gas pedal."
"Come on?" Xu Cang couldn't help frowning.
Chen Guoli naturally asked for the throttle of the still-running No. [-] engine to be added, which was also required in the checklist.The main reason is that the starting of the engine requires an air source, and now the bleed air from the working No. [-] engine can only be conducted to the No. [-] engine through the isolation valve for its use.
But if the pipeline pressure is too low, the air source for engine starting is insufficient, and the engine starting will most likely not be successful.
But the problem is that the No. [-] engine is already close to overrun, so once the throttle is added, won't it add fuel to the fire?
Chen Guoli didn't notice this problem at first, but when he saw Xu Cang's hesitation, and then he saw the exhaust gas temperature value of the second engine that had almost touched the EGT red line, he immediately understood.
Chen Guoli's face turned pale immediately, isn't this a dead end?
The No. [-] engine needs an air source to start, but the No. [-] engine, which can be used to supply the air source, can’t add too much throttle to provide enough air source because of the overrun problem. What should I do?
"It shouldn't be. Thirty PSI pipe pressure should be easy to achieve. How could it not be achieved?" Xu Cang was suspicious.
Thirty PSI is not a high line pressure standard, and sometimes a working engine can reach it at idle thrust.Of course, under normal circumstances, the speed of the working engine exceeds [-], and the corresponding pipeline pressure can basically be reached.
Now the speed of the No. 55 engine is not high, but it is still about [-], so there is no pipe pressure of [-] PSI.
Hearing Xu Cang's doubtful words, a thought flashed in Chen Guoli's mind: "Is it because of the anti-icing of the wings? It took away a lot of bleed air?"
With wing anti-icing as a big gas consumer, it may be that this thing has robbed the air source of the No. [-] engine, which led to insufficient air source output to the No. [-] engine.
Xu Cang licked his lips: "Closed!"
Chen Guoli didn't dare to be negligent, and immediately turned off the wing anti-ice switches.
When it was closed, Chen Guoli still felt that he had found the crux of the problem.However, after the wing anti-icing was turned off, the pipe pressure only increased slightly, and it still did not meet the requirement of [-] PSI.
"What the hell?" Chen Guoli was about to curse.What kind of thing is this? Xu Cang was finally persuaded to terminate the verification, but there was a problem with the gas source that started the first step. God is going to make trouble?
Chen Guoli immediately wanted Xu Cang to increase the thrust of the No. [-] engine a little, but when he saw the precarious EGT value, he finally gave up this idea.
Whenever Xu Cang dared to put on the gas, the engine would be red within ten seconds.In order to ensure continuous air supply, the accelerator needs to be kept on during the starting process.Chen Guoli didn't think that the No. [-] engine could be started within ten seconds.
"Xu Cang, what should we do now?" Chen Guoli began to panic now.
Although there were many risks before, in any case, although the No. [-] engine was turned off, after all, there was a way to restart it, so I could barely hold my breath.But now that there is no way out, Chen Guoli is unavoidably a little numb.
He is not afraid of death, but it doesn't mean he doesn't want to live.
Xu Cang's face is also not very good-looking, maybe the No. [-] engine's thrust is too small, or it may be that the altitude is relatively high at this moment, and the air is thin, which makes the pipeline pressure lower than usual.
Either way, things are not looking good for them right now.
Seeing that Xu Cang didn't speak, Chen Guoli wanted to ask the control tower for help.However, the plane is still descending slowly at this moment. Judging from the situation displayed on the CDU progress page, the plane is about to land in less than four to five minutes. He must be faster.
"Tower, we are in the process of starting the engine, the pipeline pressure" halfway through, Chen Guoli suddenly had a flash of inspiration, and he ignored the communication, turning his head and said to Xu Cang: "Since the No. How about the APU bleed air? Now the altitude is below [-] feet, no APU power supply is needed, and the APU air source can be used to start the No. [-] engine.”
There are many restrictions on the use of the APU. There are three types of power supply, gas supply, and power + gas supply. At the same time, there will be two additional situations depending on whether it is on the ground or in the air.
If only the air supply is carried out, and if it is in the air, the restricted altitude is [-] feet, which is within the restricted range.
Chen Guoli couldn't help being surprised by his wit, this is definitely a good proposal.However, if Xu Cang thinks it is feasible, he should hurry up. After all, it will take time to start the APU, and then it will take a little time to start the engine. The time is very tight.
The tower was very annoyed by Chen Guoli's half-spoken words, and immediately asked: "What's wrong with the engine starting?"
"It's okay!" Xu Cang replied directly, and then turned to Chen Guoli: "No!"
"Why not?" Chen Guoli was taken aback.
"Double bleed air!" Xu Cang's eyes fell on the isolation valve: "If the APU bleed air is connected, the APU bleed air will recoil into the No. [-] engine, and the ninth-stage high-pressure turbine of the No. [-] engine will bear the brunt. The No. [-] engine is about to stall. Is that what you are going to do?"
How old-fashioned Chen Guoli is, Xu Cang understood with just a few clicks.Due to the existence of the isolation valve, the APU bleed air and the No. [-] engine bleed air are connected, but the two bleed air clashes and repels each other, which is very likely to cause danger.There is even a double bleed air warning light on the panel of the air source system.
However, if the thrust of the number two engine can be limited to idle, then even if there is a problem with double bleed, it will not cause serious problems.But the problem is, if Xu Cang sends the No. [-] engine to the slow train, the plane will basically be in a state of no power, and it will not be able to maintain the correct downward trajectory, but it will enter a desperate state ahead of time.
Chen Guoli felt that his brain was about to stop spinning.This doesn't work, that doesn't work, do we really have to wait for the number two engine to turn off?Now the runway is full of thick snow, and it can't fall, just waiting to die?
However, just when Chen Guoli was on the verge of despair, he suddenly heard a sound of air escaping.Chen Guoli knew what it was, it was the movement of the oxygen mask being squeezed open.
I saw Xu Cang picked up his oxygen mask, and said softly: "Since the bleed air of the No. [-] engine will conflict with the APU bleed air, then turn off the bleed air and components of the No. [-] engine, but this"
"I will release the pressure!" Chen Guoli replied in a daze.
During starting the engine, the components are kept in the closed position.Now that the bleed air of the No. [-] engine is turned off, the bleed air components of the aircraft are completely turned off. If there is any pressurized air, the pressure must be released, so Xu Cang took out the oxygen mask.
"do it!"
Xu Cang put on the oxygen mask, and this action already showed his decision.
Chen Guoli had to marvel at Xu Cang's quick wit.Xu Cang is not only skilled in his hands, but also second to none in his adaptability.But the solution and its side effects came to mind in an instant.
However, there are no passengers in the cabin at the moment, so let’s release the pressure instead of turning off the engines.
Chen Guoli didn't hesitate any longer, and put on the oxygen mask, and at the same time turned the communication panel to the MASK position.Then, without stopping for a moment, he directly shut down the bleed air and right assembly of the No. [-] engine.After that, start the APU.
It takes some time for the APU to start. During this process, Chen Guoli has been paying attention to the EGT value of the No. [-] engine.What made him feel a little happy was that the EGT value of the No. [-] engine did not rise any further after it approached the red line, and it was regarded as stopping the car before the cliff.
However, this does not mean that everything will be all right, it is just the last struggle before dying.
"1533, is the engine started?" Wang Li's voice rang through the radio.
Before, the crew reported that there was a problem with the engine starting, but they were half-spoken, and the people in the control room of the tower did not know the specific situation at all.However, according to the time, if there is no accident, the No. [-] engine should have been started at this time. Wang Li wanted a definite answer.
Chen Guoli didn't think too much about it either: "Our engine started some minor faults, and it's still in the process of starting."
"This voice..." In the tower control room, Zhou Yanping was a little strange when he heard Chen Guoli's reply.He was not surprised by the content of Chen Guoli's words, but by the sound.
This sound is like the feeling of talking with your head in a tank, buzzing.
Wang Li clenched his teeth: "This is the sound only after wearing an oxygen mask. Damn it, what the hell are they doing?"
While waiting for the APU to start, some of the remaining pressurized air in the cabin leaked and soon the cabin altitude warning sounded.
However, this kind of deliberate pressure relief is not necessary to deal with it.Chen Guoli manually cut off the cockpit altitude audio warning and left the matter alone.
Not long after, Xu Cang controlled the plane to cut into the side of runway 10. Looking straight down, he could see some people and vehicles waiting beside the runway on the white snow.
These personnel and vehicles waited for the plane to circle up before entering the runway to clear the snow.
As soon as the plane was on the runway, Xu Cang immediately turned off the autopilot and switched to manual operation. At the same time, he glanced at the start panel of the APU: "Is it still okay?"
Under normal circumstances, the APU should be fine at this time.
"Fast..." Chen Guoli just wanted to say it was fast, but the fault red light on the APU tachometer turned on all of a sudden.Chen Guoli opened his mouth, and his face suddenly turned pale.
"No." Chen Guoli was startled for a moment, then went to retrieve the APU fault maintenance code on the CDU.
It can only be said that Chen Guoli knows a lot. This kind of operation of retrieving maintenance codes is generally only done by the maintenance staff, and almost no pilots can do it. However, Chen Guoli is quite familiar with the operation.
Soon, Chen Guoli called up the maintenance code of the APU, and muttered: "49-101000? Inlet air inlet failure!"
Suddenly, Chen Guoli thought of a possibility.Could it be the ice and snow that blocked the air intake of the APU?With the delicate strength of the APU, this can easily cause a failure to start.
"Xu Xucang, the air intake of the APU is malfunctioning, and it cannot be started!" Chen Guoli said with a trembling voice.
The APU also needs an air source to start. If the air intake fails, no matter how many times you try, it will be in vain.Moreover, the APU bleed air port does not have a deicing function.
Looking at the airport which was still white, Chen Guoli almost despaired.He didn't expect that after the most difficult step, he fell at the door, and he hated it!
Just this time, the plane's altitude was below [-] feet.Xu Cang pulled off the oxygen mask and threw it aside.
"It doesn't matter, I'll take care of it!" After finishing speaking, Xu Cang pressed the call button: "Control tower, keep all the people beside the runway away, I want to land!"
As soon as these words came out, Chen Guoli and the control tower exploded.
Wang Li was the first to roar: "Xu Cang, are you crazy? Eighteen millimeters, no, it's estimated to be more than twenty millimeters now, this can fall, you are looking for death! What happened to the engine, what's wrong with it? "
At this time, even the dullest person in the tower control room can realize that there must be another problem with the plane.Otherwise, Xu Cang will not forcefully land on the ground.
"The No. [-] engine cannot be started." Xu Cang said only one sentence: "I repeat, keep people away from the runway! Otherwise, if something goes wrong, I will not be responsible!"
With such words, Wang Li's face suddenly became gloomy, but after hesitating for a moment, he immediately ordered to the correspondent: "Get the field staff away from the runway quickly!"
Bi Lin stood in front of the window of the control room, watching the plane getting lower and lower, and murmured: "Xu Cang, what are you going to do?"
In the cockpit, Chen Guoli could already feel Xu Cang's unshakable determination to land.However, how could the snow of more than [-] millimeters fall, and the air volume exceeded the standard. This is indeed courting death!
"Xu Cang, are you sure?" Chen Guoli didn't stop Xu Cang at this time, he just wanted to know whether Xu Cang was going crazy or really prepared.
Xu Cang didn't answer directly, but just said lightly: "Fasten your seat belt!"
"Damn it!" Chen Guoli's face changed drastically, and he hurriedly tied up the crotch belt.
At the moment when Chen Guoli fastened his seat belt, Xu Cang suddenly retracted the throttle again, and at the same time slightly pulled the lever, the speed began to drop: "Put the flaps down, until the flaps are thirty!"
"Where's the landing gear?"
"Listen to my password later!"
Chen Guoli gritted his teeth, looked at the decreasing airspeed, first lowered the flaps to fifteen, and then continued until the flaps were lowered to thirty.
When the flap index turned to fifteen, the landing gear configuration warning sounded, and Chen Guoli immediately cut it off manually, and then ignored it.
After all the flaps were lowered, Xu Cang slightly increased the accelerator, and as the plane descended, the situation on the airport gradually became clear.At high altitude, the airport was a vast expanse of whiteness, but at a low level, you can vaguely see the outline of a runway. After all, the snow on the runway was cleared to both sides, which resulted in the thickness of the snow on the runway being slightly thicker than that on both sides. Low, this is what can be distinguished.
At an altitude of two hundred feet, Chen Guoli swallowed, his heart pounding wildly.He knew it was inappropriate for him to speak at this time, but he couldn't help it: "Xu Cang, what are you going to do?"
Xu Cang grinned suddenly, as if he had discovered the most interesting thing: "Teacher, have you ever seen a low-altitude pass?"
"Of course I've seen it before." Chen Guoli was startled: "What do you mean?"
Xu Cang's eyes narrowed slightly, and the corners of his mouth curled up: "I mean a low-altitude pass with a height of one meter!"
Chen Guoli was shocked: "What did you say?"
However, the moment Chen Guoli's voice fell, the plane had already entered the sky above the runway, and when the radio altimeter sounded at [-] feet, Chen Guoli's muscles tensed up.
On the control tower, everyone's breathing seemed to have stopped, and they were all watching intently how Xu Cang landed on the [-]mm thick runway.
Forty feet!
Thirty feet!
Twenty feet!
This series of high-level electronic messages hit Chen Guoli's heart again and again, making him almost breathless.
Suddenly, Chen Guoli heard Xu Cang fully push the accelerator.
Accompanied by the roar of the engine, the plane instinctively descended a little more.
Ten feet!
five feet!
At the moment when the five feet were reported, the plane seemed to be supported by something, and it no longer sank in the slightest.
Chen Guoli's pupils shrank suddenly, and he suddenly discovered that the plane was flying over the runway in a posture close to the ground.But in the vision of the people on the tower, everything is a different scene.
"Snow. It's gone!?"
Zhou Yanping looked at the snow that was swept away where the plane passed, and felt extremely incredible.
Xu Cang, with his usual ultra-low-altitude posture, accompanied by the powerful exhaust jet of the engine, directly blows away the snow accumulated on the road surface. Wherever he passes, the road surface is dark brown.
"Can it still be like this?"
Wang Li never thought that he could complete the snow removal work in this way. This idea is simply unconstrained, and no one can match it.
On the ground, even though the field staff who were already far away from the runway were separated by a long distance, they were still blown to pieces by the strong airflow.But compared to this, they found it even more incredible to see the runway that had been basically cleared.
The scene in front of them really opened the door to a new world for them.
While everyone on the control tower was watching Xu Cang's "Snow Removal" performance in shock, Bi Lin just watched the radar screen silently, and he discovered an even more frightening reality.
That is, after Xu Cang entered the air above the runway, he kept skimming at an ultra-low altitude of three feet above the ground, neither high nor low, just three feet, exactly one meter, exactly, this manipulative ability is simply unbelievable.
You should know that there is ground effect at low altitude, which will affect the pilot's control.If it is too far from the ground, the exhaust jet of the engine will not be very effective in removing snow.But it's too close, and it's easy to hit the ground. It's so difficult to grasp, it's unimaginable.
Looking at the passing road, Chen Guoli felt his mind went blank. He felt as if he was not sitting on a plane, but a very stable car driving on the road.
"This is his strength?"
The moment Chen Guoli asked this question, he lowered his head slightly, and suddenly found that the EGT indicator of the No. [-] engine had exceeded the limit and turned into a red display.
No wonder, in order to maintain a low-altitude pass, Xu Cang increased the gas pedal, the engine was already close to overrun, how could it hold on now?
"Xu Cang, you're speeding!" Chen Guoli shouted.
When Xu Cang was passing through the field at low altitude, he stepped on the accelerator but didn't take it back.Because Xu Cang knows that if this is added, the engine must be useless, and it doesn't matter whether it is recovered or not. It is better to accumulate more energy for the aircraft, and its performance is the increase in speed.
However, with the accelerator on full throttle and the stick on the stick, the speed of the plane increased all of a sudden, exceeding the speed limit of [-] flaps.
"Flaps offloaded!"
"No matter!" Xu Cang shouted coldly.
At this moment, as soon as the plane passed the end of the runway, the dying engine gasped twice, finally ushering in the end of its life.However, at the time of its fall, its last effort has been made.
At this moment, Xu Cang slammed the lever, turned slightly to the left, and shouted at the same time: "Put down the landing gear!"
Chen Guoli was stunned for a moment, gritted his teeth, and put down the landing gear handle without caring about anything else.
As soon as Chen Guoli finished his movements, Xu Cang turned left for only a moment and immediately leveled off the slope, then turned right continuously at full slope, and at the same time took the pole backward.
Although the landing gear basically produces resistance, at the beginning of lowering the landing gear, due to the influence of the center of gravity brought about by its release, the aircraft will instead raise its head briefly, as if a drowning person is struggling to get out of the water.
It was such a fleeting energy that caused the plane to rise slightly, as if a dying person breathed a sigh of relief.What's more, the high speed brought by Xu Cang's accelerator pedal played a role.
Xu Cang always carried the stick to prevent the plane from falling down during the turning process.At this time, there is only one reason why the plane can not fall down, that is, there is still speed.
Altitude is speed, speed is altitude!
The high speed accumulated before has become the weight to maintain the height!
Xu Cang's turning action was quite decisive, turning with a slope of more than [-] degrees.After a while, Chen Guoli could already see the runway from the side.However, the moment his gaze caught his eye, he was taken aback.
There is still a vast expanse of whiteness, and some have only a dark brown, no snow-colored regular runway.
"This..." Chen Guoli was in charge, and for a moment he didn't understand what happened.
When Xu Cang saw all this, his eyes burst into light, he maintained the slope, and continued to turn.
Just when the three indicator lights of the landing gear all turned green, the nose of the plane was aligned with the runway.
Because Xu Cang's turning timing was extremely early, the plane had already reached the sky above the runway almost at the moment when he was facing the runway.At this moment, the speed of the plane was close to shaking the stick, Xu Cang could no longer continue to bring it back, so he had to lower it slightly, but not more, otherwise the front wheels would touch the ground first, and the consequences would be disastrous.
Anyway, the speed of the plane was also low, and the energy was also low, even Xu Cang could do nothing, he put his left hand directly from the thrust handle, and immediately lowered the flaps from [-] to [-].
With the initial lift generated by the continued lowering of the flaps, the sinking that was about to get out of control was slightly offset.However, after only such an instant of slowing down, the plane finally smashed hard on the runway, as if the whole plane was about to fall apart.
As soon as the plane landed, Xu Cang pulled up the speed brake almost instinctively, and pushed the steering wheel forward to the bottom at the same time.And Chen Guoli, who was beside him, after a short period of absent-mindedness, broke out the most exciting roar: "We... survived!"
I didn't expect to write so much.
Thank you Xingluan i for the rewards, I haven't received the rewards for a long time, so I'm smiling.
(End of this chapter)
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