Chapter 23 The tip of the knife dances and turns in a stall!
Chapter 23 The tip of the knife dances and turns while stalling!
From the moment the engine problem occurred during the takeoff roll, the captain's spirit was in an extremely tense state. Some of his reactions were understandable, such as overreacting to perform the memory items of the engine fire alarm serious damage or separation checklist.
Xu Cang's actions undoubtedly awakened the captain. The captain was just tired, not because he was not strong enough. Almost instantly, the captain understood his mistake and immediately retracted the engine on the No. 1 engine.
Right hand of thrust handle.
He gently pulled the start button of the APU, and at the same time looked back from his left side window, but he did not see the runway of Jianchuan Airport. Because the runway was directly behind the aircraft at this time, it was already in the blind spot of the field of vision.
However, what really puzzled the captain was the turning direction Xu Cang said he chose.
"Why don't you turn right?" The captain's mind was now clearer.
"The sideslip and wind will push us further and further away, and we won't be able to turn back." Xu Cang's answer was quite brief.
At this moment, the stable crosswind is blowing the aircraft from left to right, and even if the thrust of the No. 1 engine is constantly decreasing, this means that the sideslip of the aircraft is constantly decreasing, but it does not mean that there is no sideslip. As long as
If sideslip exists, the aircraft will have a tendency to deviate to the right. At this moment, if the aircraft chooses to turn to the right, under the influence of two positive feedback factors, when the crew turns 180 degrees, they will find that the aircraft
It had already drifted quite a distance to the left side of the runway.
When you are motivated, this may not be a big headache, but when you are not motivated, it is an extremely troublesome problem.
Engine No. 1 had its last bit of stubbornness. It was still running hard amid the burning flames, but Xu Cang knew very well that this was just the reaction of the engine returning light.
"Can we turn to the left? Can we turn around?" The captain expressed concern about this.
Xu Cang's expression remained unchanged: "If you can't turn around, then increase the slope!"
"But on a steep slope, the height will drop quickly and you won't be able to hold on to the field."
"Then you should pray that engine No. 1 can burn a little longer."
The exchange between Xu Cang and the captain was extremely brief, but it was like a normal chat between ordinary people. However, at the end of the conversation, the captain was obviously unable to hold back, and he felt like he was gritting his teeth with every word he said.
It could be heard that the captain couldn't help but get nervous, especially after discovering that the plane couldn't turn at all.
Both the wind and the residual thrust of the No. 1 engine prevented the plane from turning left, which was what the captain had been worried about. Xu Cang was relatively conservative at first and only used a slope of about 20 degrees.
For a single-engine aircraft with flaps down to 1, this is not an overly conservative slope, but it is obviously unable to cope with today's situation.
Although the turning slope has been formed, the change in heading is extremely slow. If this situation continues, the aircraft may not be able to turn around until it reaches the runway above.
The captain said anxiously: "The wind is too strong, and the turning gradient is limited in single-engine mode, so it's impossible to turn."
"If you can't turn, it only means that the slope is not big enough. What's the slope limit? I don't care about it at this time!" After saying that, Xu Cang directly ignored the limit of turning slope under the lack of power and directly increased the slope to
Between thirty degrees and thirty-five degrees.
"Inform the cabin to make an emergency landing immediately and prepare for collisions." The sweat on Xu Cang's forehead dripped down his brows, slid over his cheeks, and moistened his lips. Xu Cang pursed his lips, and he could feel his heart pounding.
Jumping wildly, huge amounts of fresh blood were transported to his limbs and bones. He was in urgent need of this now.
"If possible, declare MAYDAY, contact the control to apply for evacuation in place, and request ground support."
Previously, Feiyu 6321 declared a PANPAN state, which is a minor emergency compared to MAYDAY. But now it has obviously exceeded the definition of PANPAN and needs to re-declare an emergency state, which is MAYDAY.
The situation was urgent just now. Xu Cang only reported his intentions and did not update the emergency status. Now he needs the captain to help him do all this, and the request to evacuate in place after landing must also be reported.
The captain didn't hesitate. As soon as Xu Cang opened his mouth, he immediately prepared to notify the cabin team. But as soon as his eyes caught sight of the PFD display, he broke out in a cold sweat.
At this moment, the airspeed of the aircraft was just at the top of the red and black speed band of the minimum speed, and the pitch limit indicator that looked like a small eyebrow was tightly attached to the attitude indicator of the aircraft.
Although the No. 1 engine still has some residual power, it is not enough to provide the additional downward trend generated by the aircraft when turning. Why is it often impossible to return when both engines lose thrust after takeoff? The problem lies in the turn?
Once the aircraft turns, the lift generated will be decomposed, which means that the aircraft will lose altitude faster. An altitude of five thousand feet is already insufficient for straight twin-engine gliding, not to mention that the aircraft is still turning?
The power of the No. 1 engine cannot support the aircraft to turn while maintaining sufficient maneuvering speed. This has nothing to do with the crew's control ability. It is determined by the purest laws of physics, and no one can change it.
Therefore, Xu Cang had to choose between high speed and speed. Obviously, Xu Cang felt that altitude was more important, so he decided to release some kinetic energy, that is, to hold the steering wheel slightly to stop the aircraft.
Falling momentum.
But under the premise that there is not enough power, this action is a standard deceleration behavior. Therefore, not long after forming a slope of more than 30 degrees, the speed of the aircraft has dropped from the flap one maneuvering speed to close to the stick shaker speed.
Since the plane formed a slope of more than 30 degrees, the change in the plane's heading began to become obvious. Xu Cang calculated based on the heading of Runway 05 that they would need to maintain this slope for a while.
However, the plane was beginning to fail! The height of the plane was still precarious. Xu Cang couldn't let go of the steering wheel. He had to keep it on, which meant that the speed was still higher than the one he sacrificed.
"It's going to stall, it's going to stall!" When the captain saw that Xu Cang hadn't released the stick yet and was still holding the stick, his voice shrilled: "Hurry up and let go!"
The hair on the captain's whole body stood up. At this time, the plane was not only turning, but also slipping slightly.
What is a stall with sideslip? That is a spin! As long as a gust of wind blows by, the aircraft will roll over without any control, without any life.
However, the captain's reminder did not stop Xu Cang's operation at all. He was still holding the steering wheel. The speed of the aircraft immediately broke through the red and black speed zones, and the attitude indicator also crossed the pitch limit indicator. At the same time, the aircraft stalled.
The signal sent by the management computer commanded the two steering wheels to start shaking.
The plane shook its stick!
Chapter completed!