Chapter 332 Landing! A weird stall rarely seen in the world!

Author: Mei ZiXu

Chapter 332 Landing! A weird stall rarely seen in the world!

Richard's ability is quite strong. After experiencing the initial panic, he finally stabilized the plane. As the altitude decreases, the wind volume tends to decrease and stabilize, and the control difficulty becomes smaller and smaller.

For landing under extremely large headwinds, the difficulty is that there cannot be a large included angle for a long time, because the amount of headwind is too large. As long as there is an obvious included angle, the airflow will impact the fuselage, causing the included angle to become larger. However, this clamp

The angle will not continue to be too large. When the angle reaches a critical value, the aircraft's yaw stability will take effect.

The headwind airflow will impact the deflected vertical tail, forcing the aircraft back to a trajectory parallel to the airflow.

However, due to the high approach speed, Richard was given very little time to make corrections. Moreover, the runway was heavily covered with snow and the braking effect was extremely poor. It was better to straighten the aircraft in the air rather than wait until it touched down.

cross.

It can only be said that the president of the International Federal Airlines Pilots Association does have two brushes. After getting used to it for a while, he seemed to have found the trick and stabilized the plane to an altitude of about two hundred feet.

From this height, the entire Manor Airport can be clearly seen. However, due to the heavy snowfall, except for the approach light poles that can be guided to the center line of the runway, the rest of the place, including where is the runway, where is the taxiway, where is

Outside the Tao, nothing is known, it is a vast expanse of white, without any reference at all.

"The ground speed is sixty knots, the indicated speed is two hundred and ten knots, and the altitude is two hundred feet!" Richard became increasingly skillful and even reported several important flight data to Xu Cang on the eve of landing.

Suddenly, a green light flashed from the top of the tower near the airport, and Richard immediately understood: "The tower has given a light signal, and you can land."

"After landing, turn off both engines, push the lever to the maximum, and use the maximum automatic brake. Do not use manual brakes." Xu Cang reminded.

At this time, Xu Cang felt that his vision seemed to have recovered a little. At least the surrounding black vision area had obviously faded a lot. This was the result of blood starting to supply the brain and the optic nerve reactivating. However, it would take some time for him to fully recover his vision.

It will definitely be after landing.

"Don't you want to push back?" Richard's eyes did not move, but he still couldn't help but asked in doubt.

"No! You control the aircraft very well. The aircraft is at a very low speed. Even if reverse thrust is used, the effect will be mediocre. Moreover, if reverse thrust is used, the snow on the road will cause greater damage to the engine. Simply shut down the aircraft. It is more than sixty knots.

With a ground speed of 1,600 meters, a runway of 1,600 meters is enough.”

The muscles on Richard's face twitched a few times. Unexpectedly, at this time, Xu Cang was still concerned about the two engines.

Indeed, when the reverse thrust is turned on, the air grille of the engine inlet opens, causing the direction of the airflow to reverse. If a large amount of snow water is sucked in during this time, whether it is the snow water itself or other substances mixed in it, there is a high possibility that it will cause pollution.

The entire engine.

The effect of reverse thrust is at high speeds, but the effect of reverse thrust at low speeds is actually very average.

Instead of risking the scrapping of two engines to seek a reverse thrust with limited effect, it is better to shut down the engine directly and protect the engine, which is more cost-effective.

Being able to say something like this shows that Xu Cang is quite confident about landing.

Richard did not dwell too much on this matter. At such a low ground speed, the effect of reverse thrust is indeed very poor. What Xu Cang said makes sense. After all, two PW6000 engines cost tens of millions of dollars.

It is better to keep it naturally.

"If there's an accident, I'll try to deflect out."

Before landing, Richard gave Xu Cang one last reminder. His original intention was that if an accident occurred and the plane could not stop on the runway, he would try to deflect the plane. At that time, the plane was taxiing

If the road is still the airport, then he can't care about it.

You must know that the end of the runway faces an extremely steep downhill slope. If you rush down, there will definitely be no possibility of survival.

But before Richard could say anything, he suddenly felt that the nose of the plane was falling.

The nose of the plane dropped very strangely, because in an ultra-low-altitude environment, the head wind suffered by the plane was relatively stable, and it had no ejector rod, so how could the nose of the plane fall down?

Moreover, the nose dive was not caused by airflow or control. It was as if the aircraft suddenly ran out of power.

If a pilot encounters this kind of situation and the nose of the aircraft falls down, he just needs to use the stick. This is a normal operation.

But Richard was different. His vision and skills exceeded 99% of the pilots in the world, and he belonged to the top group. He immediately noticed that there was something abnormal about the nose-down situation, which was without warning and unexpected.

For example, if it is affected by airflow and control, it is more inclined to another situation.

"Stalled?"

Richard first thought of this factor, but the plane's stick shake warning did not sound.

However, there is a situation where the stick shaker warning does not sound but the vehicle stalls, and that is severe icing.

If there is heavy ice on the wings of an aircraft, it will change the surface structure of the wings to some extent, thus directly affecting the flow of air on the surface of the wings.

The aerodynamic layout of an aircraft is an extremely sophisticated technical project. How the air flows, at what speed it flows, and what kind of effects it produces are all determined through various tests before commercial use. Once the wings are heavily iced,

, which will undoubtedly break the original aerodynamic layout, thus affecting the generation of aircraft lift.

It is for this reason that airplanes are very taboo about icing.

The aircraft's angle of attack detector can detect the data of the aircraft's angle of attack. However, the reason why the angle of attack is too large and causes stalling is that when the critical angle of attack is exceeded, the airflow flowing through the wing surface will separate. Therefore, once the angle of attack detector detects the aircraft's angle of attack,

If the angle of attack is too large, a stick shake warning will be issued.

However, if it is icing, the aircraft's angle of attack itself does not increase, but the stall occurs due to the ice accumulation directly changing the aerodynamic layout of the wing. In this case, the angle of attack detector cannot detect it, and the stick shaker naturally occurs.

There is no longer any warning.

Moreover, when on the ground, Richard and Xu Cang were extremely worried about the problem of ice accumulation on the aircraft. The wind and snow here were too fierce and the temperature was too low, so the anti-icing fluid may not be effective. Not long ago, the aircraft was only slightly close to the cyclone.

, several flight data probes were blocked due to ice. Although they melted and became unobstructed later due to the friction and heat generated by the aircraft's dive, it also shows how serious the ice accumulation inside the cyclone is.

From this point of view, it is very likely that the wings of the aircraft are iced, causing an effect similar to a stall.

"The wings are frozen and it's stalling!" Richard felt more and more frightened. If he had used the stick like an ordinary pilot just now, it would undoubtedly have deepened the stall, and there would be no way to change it.

Without thinking, Richard directly pushed the stick up, and the speed of the plane began to increase instantly. In such a situation, it is usually necessary to add more throttle, but Richard was afraid that adding more throttle would cause the plane's speed to increase too much.

increased, so he did not move the accelerator.

Considering that the tendency of the nose to nose down just now was not too obvious, Richard felt that even the stall should only be shallow, and it should be able to be corrected by pushing down the stick slightly.

Now the altitude was only two hundred feet. The height margin was definitely not enough, but it was barely enough for him to recover and land.

Xu Cang heard what Richard said before pushing the pole. He could vaguely see the situation outside at this time, but he did not take over the control because he did not feel that there was anything wrong with what Richard did at that time.

.

At an altitude of two hundred feet, pilots of his and Richard's level could completely recover and land, especially since the stall didn't seem too serious.

However, as Richard pushed the stick deeper, he suddenly felt something was wrong. Generally speaking, due to the stalling of the wings, the lift of the aircraft is reduced and the nose of the aircraft is pitched down. This is a normal logical chain.

However, as the ejector rod moves, the stall should be suppressed and the plane's control surface effect should be restored. But in fact, why does he feel that the plane is falling faster and faster, and it is still in that soft and floppy state?

It doesn't mean that if Richard pushed the pole, the plane would fall faster and faster.

The thrust of the aircraft is sufficient, and Richard maintains a relatively stable attitude after ejecting the pole. In this case, the aircraft's falling speed will increase, but it should only occur when Richard ejects the pole.

At that moment, when the aircraft's attitude stabilizes, the aircraft's falling speed should also stabilize.

However, the fact is that even though Richard maintained a relatively constant attitude, the plane's descent speed was still accelerating, which was actually quite strange.

In fact, a better explanation for this situation is that Richard's operation of the ejector rod did not actually eliminate the effect of stalling.

The plane was still in stall.

"Not enough improvement?"

Richard first thought of this possibility, but he had already pushed the pole. If this could not be corrected, wouldn't the aircraft be in a deep stall?

But judging from the physical sensation and the previous visual nose drooping trend, the aircraft should not be in a deep stall, right?

If the plane was in a deep stall at that time, they could basically close their eyes and wait for death now.

However, even though he didn't quite understand it in his heart, Richard couldn't believe the facts before his eyes. The current state of the plane looked like it was falling due to the loss of lift in a stalled state.

Therefore, Richard began to increase the amount of push rod, hoping to bring the aircraft out of stall first, and then perform a level landing.

However, in this case, the height space that was not abundant in the first place suddenly becomes tense.

The speed of the aircraft is already high, and the resulting standard rate of descent will also be very high. Richard pushed the stick like this again, and the aircraft's descent rate briefly exceeded 1,800 feet, and it was almost touching the ground.

However, at this time, Richard was a little bit stuck, and even said that he was caught in the pipeline effect. He was thinking about the stall in his mind, thinking that he could level the plane at the last moment, but in fact, the condition of the plane was already in danger.

In fact, Xu Cang also had some signs of this.

Both of them felt that they should recover from the stall first and then touch down.

However, Xu Cang's mind suddenly recalled the stick shake warning he had encountered during the previous dive. That time, Xu Cang also reversed the stick shake, but in the end the stick shake warning did not disappear. The speed at that time was much greater than now.

Although there was no stick shaker warning this time, judging from the sinking and drooping of the nose of the aircraft, the aircraft was undoubtedly in a stall, and the stall situation was still getting worse, or at least it had not recovered.

In both cases, the same processing method yields almost the same results.

The recovery method of stall recovery is absolutely correct, otherwise, the stall push rod will not become something engraved in the pilot's genetic instinct. So, what is the problem if the stall push rod cannot restore the stall?

There is no problem with the correction method, but there is something wrong with the stall itself!

Suddenly, Xu Cang thought of an extremely rare possibility.

"Damn it!"

At this moment, Xu Cang didn't care whether he could see clearly or not, and shouted: "Let go!"

After saying that, Xu Cang directly carried the pole back a lot.
To be continued...