Aircraft spiral is an extremely dangerous complex state, an extension of the stall state. Blue Sky 9433 accidentally entered a spiral state, which will cause the plane to fall around the axis, and the speed will get faster and faster, and finally it will not be able to change out.

Generally speaking, it is easier to change the spiral of an aircraft in an upper monoplane configuration. Even so, the spiral state is quite dangerous for an upper monoplane, let alone a large aircraft like the 737, which is not an upper monoplane.

Once caught in a spiral, if it can't be changed out in time, the plane will spin faster and faster, and eventually it will not be able to stop. At extremely high speeds, the aircraft will continue to be overloaded, and as a result, the aircraft will be overwhelmed and then disintegrate.

Of course, now that the altitude of the blue sky 9433 is so low, it will not reach the level of disintegration of the plane and it will hit the ground.

For a large passenger aircraft like 737, it is strictly forbidden to enter the spiral state, but if you really want to enter, the change action is still the same.

The reverse rudder in the direction of the spiral stops the rotation of the aircraft, and then the stall is changed.

At the end of the day, a spiral is a stall that keeps turning. If you turn too fast, the rudder won't be able to stop spinning, and it will keep spinning and falling.

Fortunately, the plane is just about to enter the spiral state at this time, as long as the throttle is retracted, a left rudder kicks the aircraft, and then the ejector rod reduces the angle of attack.

Of course, Instructor Chang knew how to change the spiral, but it was at this critical moment that the plane plunged headlong into the low-altitude birds due to the sharp fall.

What kind of birds these are, Xu Qing can't see clearly. However, it is not a small bird such as sparrows and swallows, but much larger.

The low-altitude birds were densely packed and poured like cannonballs on the windshield. Under the high-speed impact, the flesh and blood could not resist at all, and they were smashed to pieces one after another, covering the windshield. What Xu Qing saw was clearly a bloody windshield, and he could barely see the outside.

With a muffled explosion, the windshield on Instructor Chang's side cracked directly, and spider web-like cracks were densely covered on the windshield.

It was this sturdy one, which really scared Xu Qing's soul, such a serious bird attack, Xu Qing was really unheard of.

Fortunately, the windshield is cracked but not broken, although it looks very dangerous, but it is stubbornly resisted.

It was only after the initial shock that Teacher Chang reacted immediately. Regardless of the crumbling windshield, retract the throttle again, press on the left rudder, stop the plane to deflection, and prepare the ejector rod to exit the stall.

With just one exertion, there was a pinprick pain in both hands, more than ten times stronger than just now.

Under the pain of drilling his heart, Instructor Chang's hands were weak, but he didn't resist the rod.

Reached the limit?

Instructor Chang angrily put his hands on the steering lever but couldn't use it, but the stall has not been changed! After entering a deep stall, the plane will fall down like an iron lump, so the ending is not the same?

Just as Instructor Chang struggled, the steering stick in his hand was jerked forward. The plane jerked its head down, and the angle of attack decreased.

Instructor Chang turned his head to see that Xu Qing had taken over the plane at some point.

"Master, I'm coming!"

Xu Qing resisted the lever and added back the throttle again, allowing the plane's speed to continue to increase, and finally got out of the stall state.

Don't look at Xu Qing, they are thrilling in the sky, the duty director looks at the trajectory and altitude of the blue sky 9433 on the radar, which is also like a roller coaster. It wasn't until the duty director saw that the blue sky 9433 stabilized the height that he breathed a sigh of relief.

Xu Qing increased the throttle, but he found it difficult for the plane to maintain altitude and re-cut into the proper glide profile.

The loss of lift due to a broken wing is already seriously affecting the performance of the aircraft, not to mention that they now only have one engine.

And because the lift on both sides is extremely unbalanced, Xu Qing always has to carry out the left pressure plate to maintain the stability of the aircraft.

What's worse is that the shredded corpses and blood of the birds cover almost all the windshields, and it is impossible to see the outside at all, let alone the PAPI lights.

To add insult to injury, it seems that the bird strike damaged the wiper mechanism, and turning on the wiper switch could not turn on the wiper either. As a result, it is impossible to remove the obscuration from the windshield at all.

Xu Qing is now a real "blind flyer".

"Use blind landing, use blind landing signal." Instructor Chang saw that the windshield wipers were not available, and his brain turned quickly, so Xu Qing followed the blind landing signal and flew to the head of the runway.

The blind landing signal can be guided all the way to the runway head, as long as the blind landing signal is accurate and stable enough, the aircraft can strictly follow the blind landing signal. Theoretically speaking, until grounding, the pilot does not need to look outside, as long as he strictly follows the blind landing signal.

This is the "three types of blind landing" that are rarely used in China and even in the world, and the situation Xu Qing is facing now is in line with the highest level of CATC among the three types of blind landing, that is, the visibility and cloud height are all zero.

At present, there are only two airports in China that have the qualification to open three types of blind landing, but only a handful of times have been used.

First, the three types of blind landing have very high requirements for the blind landing signal, and once there is a deviation, it may not be possible to guide the aircraft to where to go. Second, the requirements for the unit are also particularly high, so the use of the three types of blind landing has always been cautious.

The three types of blind landing not only require the blind landing signal to be accurate enough, but also require the whole process of automatic driving landing, however, now Xu Qing does not talk about automatic driving, even the normal state of the aircraft is difficult to maintain, and it is difficult to accurately follow the blind landing signal!

Similarly, although the airport in K city is a large hub airport, it does not have the qualification of three types of blind landing, that is to say, the blind landing signal of K city cannot reach the accuracy of three types of blind landing. However, Xu Qing can't care so much now, he can only follow the blind landing signal on the 21st.

"Tower, I'm going to follow the blind landing signal approach on the 21st now, if I have a serious deviation, please remind me." Xu Qing said to the tower.

The location map of the aircraft can be seen on the tower radar, if the No. 21 blind landing signal is pumped and the aircraft is guided indiscriminately at low altitude, the tower radar can be seen clearly, and it is better to let the tower remind it when the time comes, than Xu Qing to follow the blind landing signal and fly around.

If the blind landing signal is unreliable, Xu Qing can also ensure that the plane can land on the runway by keeping it on the runway extension on the navigation page. But this method has too much error, and it is a last resort, Xu Qing does not want to use this crude method. Moreover, this method can only roughly ensure that the horizontal position of the aircraft is correct, and the grasp of the vertical height depends on Xu Qing's calculation. The full-screen feeling drops and is likewise a great risk. I can't say it, I was grounded before I entered the runway.

The duty officer snatched the microphone of the tower controller again and asked urgently, "Aren't you eye-to-eye?" Why do we need to remind you of bias? Also, why did you go down so fast just now? ”

Xu Qing: "The wing was broken just now, and the state of the plane was not grasped, and now it is almost back in control." However, during the period, it encountered a large number of bird strikes, and the wipers failed, and it was impossible to remove the obstruction on the windshield, so it could only be guided by blind landing. ”

The duty director gasped, he didn't expect the wing to break, but fortunately the plane was still under control. But he has a huge worry in his heart: "The blind landing accuracy of our No. 21 cannot reach the three types of accuracy, especially at low altitude, what if there is a problem with the blind landing signal?" It's hard for you to handle at low altitude! ”

"So what's the solution? There is a problem, that is, the fate is not good, now the aircraft has a serious loss of lift, or a single engine, and it is difficult to even maintain level flight, there is no other way. Xu Qing insisted.

"What about autonomous driving? Can you be on autopilot in your current state? The duty officer asked.

Not to mention the third-class blind landing, even the second-class blind landing must be landed using automatic driving. If the blue sky 9433 can use automatic driving in this matter, it is estimated that the duty director can still accept Xu Qing's approach, but now that the second engine is out, the wing is broken, and the hydraulic pressure fails, how can the automatic driving be connected? Artificial flying three types of blind landing is just a joke!

Even if you are lucky today, the blind landing signal is no problem, can the crew accurately follow the blind landing guidance under so many failures of the aircraft?

Xu Qing: "No, now the automatic driving can't be connected, I fly manually and land manually!" ”

"No! No way! What is the condition of the plane now, your manual approach is a joke about the lives of the people on the plane! The duty director still couldn't accept Xu Qing's proposal, he felt that this was no different from sending him to death.

Just two seconds after the duty director rejected Xu Qing's proposal, Xu Qing's almost desperate roar came out of the frequency: "Then what do you say?" You tell me how to do it so that you don't joke with human life! You tell me! ”

At this moment, Xu Qing seems to have returned to the day of 2.19, lonely, helpless and desperate!

He doesn't know that the blind landing signal in City K does not meet the requirements of Category III? He doesn't know that the three types of blind landings must be automatically implemented? He doesn't know that under the current situation of the aircraft, manual flight is very good to accurately follow the blind landing signal?

But what can he do? The plane was single-engined, the wings were broken, he couldn't even keep the plane flying level, who could give him a chance to return to flight? Who can give him even more opportunities to think about what to do?

Teacher Chang's hands are injured, and he can only rely on himself, just like 2.19!

Find a glimmer of life in the midst of death!

Neither the director on duty nor any of the controllers in the control room fell into a deep silence, and the needles in Noda's control room could be heard in an instant.

Xu Qing's roar was filled with overwhelming desperation, and none of them present could give a solution as they saw fit.

The indifference of the duty director who had gone through the wind and rain couldn't hold back at this time, he was really panicked, he didn't even know what to do now? What to say? There is only a blank in my head!

He's stopped! He can't solve the current dilemma!

Just when the control room fell into a deathly silence, an old voice came from the frequency again: "I am Chang Jianjun, the captain in charge of Blue Sky Flight 9433!" Now I have injured both hands and cannot control the plane, and then the co-pilot Xu Qing will complete the manual three-class blind landing. Whether it meets the requirements or not, no matter how difficult it is to manipulate, we have no way back! If...... If the plane is lucky enough to land safely, I will personally bear the irregularities in this decision! I'm the captain of this flight, and that's the final decision! ”

The captain's decision is final and no one can change it! No matter how much the control doubts his decision, and how much risk he takes if he does not control his decision, at least at this moment, the captain is the authority, the hammer that sets the sound!

Now that the captain of Blue Sky Flight 9433 has made the final decision, all they have to do in the control room is to do everything they can to cooperate.

The director on duty knew that the captain of this flight was Chang Jianjun's instructor, and he had already heard Chang Jianjun's voice. It's just that he never expected that the co-pilot who is now controlling the plane turned out to be the legendary co-pilot Xu Qing in the 2.19 incident.

Maybe...... Can he create a 2.19 miracle again?

Obviously, many of the other controllers in the control room knew Xu Qing's name, and for a while, there was some hope.

It's really possible that they will witness a new legend!

"Blue Sky 9433, your current position is too much on the right side of the course, you need to correct it quickly! The five sides are very short! The duty director quickly accepted Xu Qing's practice of manual three-class blind landing, and quickly adapted to the role, and began to direct Xu Qing to turn back to the flight.

Just now, due to the inconsistent lift and thrust, the plane made two large right turns, which allowed the plane to pass directly through the five sides, biased to the right side of the courseway, and the deviation was still very large.

In fact, there is no need for the duty officer to remind him, Xu Qingguang can find that he is very far to the right from the channel signal, and at the same time, because the five sides are very short, because there are no flaps and leading edge devices, his approach speed is very large, with a speed of Vref40+55, and there is not much time for him to correct.

Xu Qing didn't want to turn left and cut back to the course, but the plane didn't allow him to do so.

Xu Qing's left pressure plate is almost to the end, but it can only resist the rolling effect caused by the imbalance of lift on both sides, and it is impossible for the plane to form a left slope. Xu Qing could only use the rudder to make the plane deviate to the left little by little. He must not step on the left rudder too much, otherwise the plane will deflect to the left for a long time, and the lift will be more difficult to maintain. Now their lift is already insufficient, and if they lose lift, it is a question of whether they can fly on the runway.

Compared with the large deviation on the course path, the deviation on the glide path is still acceptable. Now they are a little and a half lower than the glide track, but Xu Qing maintains a decline rate of only five hundred, so he is ready to maintain a decline rate of five hundred first and cut into the glide path from below. After cutting into the glide path, turn into the normal approach descent rate.

Judging from the control radar, Xu Qingzheng methodically switched back to the channel of No. 21, and judging by this trend, he should be able to switch back to the correct course two nautical miles from the runway. The glide path is more gentle, and it seems that it is not difficult to cut into the glide path.

Xu Qing's control end is extremely strong!

Now the problem is the leveling stage, because the outside world cannot be seen, the pilot can only rely on the radio altimeter to determine the sinking of the aircraft. Without visual reference, it is difficult for the pilot to grasp the leveling of the plane, and it is very easy to cause a heavy landing.

Even if Xu Qing can fly the plane to the runway, he can't deal with the problem of leveling the grounding, which is extremely dangerous!