"Any other questions?" Cheng Guangyu was stunned. He thought that the plane passed through the inspection vehicle by pressing the plate, which would be considered a success. But listening to Xu Xian's meaning, could there be something unexpected?

"Now the aircraft only has one left main landing gear, and the aircraft cannot slow down, otherwise the aircraft will not be able to maintain a single-wheel taxiing state. If the aircraft cannot slow down, then the remaining runway will not be able to support the aircraft's taxiing for too long. In this short period of time, if

If we need to put down the rest of the landing gear, we'll run out of time..."

Cheng Guangyu woke up as if from a dream: "Yes! Why didn't he put down the other landing gear? If he put it down, nothing would happen next. Even if the other landing gear was put down, it would not affect

Pressure plate!”

Only lowering the left main landing gear serves as the pressure plate, allowing the left wing to press down and the right wing to rise. If the other landing gear is also lowered, it will not affect the operation of the pressure plate. Then why is it worth lowering the left main landing gear?

?As a result, it cannot be ended later.

What Xu Xian said is indeed a huge problem.

As long as it is operated properly, the aircraft can maintain a single landing gear roll. However, the premise of all this is that the aircraft maintains high-speed motion, otherwise the wings cannot generate enough lift to maintain the single landing gear support state.

However, due to the effects of air resistance and ground friction, the thrust needs to be increased appropriately.

Since it takes a while to put down the landing gear, the aircraft can only maintain high-speed movement. Otherwise, the aircraft body will directly rub against the runway before the landing gear is put down.

However, if the aircraft maintains high-speed movement, it will only take a short time to complete the rest of the runway. This short time is not even enough for the remaining landing gear to be lowered. Therefore, even if the aircraft gets over the obstacle of the patrol car, it will still face a problem behind it.

The problem of stopping the plane.

At least for now, this problem has no solution.

"The right main landing gear must not be lowered. Otherwise, when rolling to the left, the right landing gear will lift up. At that time, it is very likely that the engine pod did not hit the patrol car, and the right landing gear would scrape the patrol car.

Car, this is a question of trade-offs, there is no solution to both problems!" Xu Xian analyzed: "However, I don't understand why the nose landing gear is not lowered. Logically speaking, it does not matter whether the nose landing gear is lowered or not.

It’s only right if it encounters a patrol car. It won’t affect you. What’s the point of letting go? No, if the plane can’t stop on the runway, then it can only go around!”

"Go-around? You mean he wants to go around again, crosses the patrol car, and then goes around again?" Cheng Guangyu exclaimed.

Xu Xian became more and more certain: "It must be! He must be restarting the second engine. But in order to prevent the second engine from being delayed, he must be prepared for a single-engine go-around, so..."

"So, he must use the landing gear as little as possible!" Cheng Guangyu echoed.

The existence of the landing gear itself will increase the resistance, which will have a negative impact on the go-around performance. Due to the existence of the fault of the aircraft itself, the go-around performance is very poor. If the resistance of the landing gear is added, it is estimated that even the initial

Climbing is no longer possible.

Therefore, Xu Qing could only reduce the impact of landing gear drag as much as possible.

The drag produced by the left landing gear alone is definitely much smaller than the left landing gear plus the front landing gear.

Under normal circumstances, Xu Qing's ultimate goal was to restart the second engine. Not lowering the front landing gear was just a necessary precautionary measure to prevent the second engine from starting within the normal time.

In the cockpit, Xu Qing pressed the plate directly and raised the right wing. At the same time, Lu Xinyu observed the fit between the left wing tip and the ground through the left side window. He wanted to ensure that the left wing tip did not touch the ground, otherwise

, the tip of the left wing scratches the ground, which will affect the directional stability of the aircraft.

It has to be said that Xu Qing's operation was extremely precise. He just pressed it directly, and in one step, the tip of the left wing was just on the ground surface, and the wing tip continued to cut the green grass emerging from the ground. This

This means that Xu Qing controlled the distance between the wing tip and the ground to a very small 20 centimeters, as precise as a machine.

The touchdown point of the aircraft was already very close to the inspection vehicle. Coupled with the relatively high approach speed, within two or three seconds of Xu Qing's pressure plate changing the attitude of the aircraft after touchdown, the engine pod on the right wing of the aircraft

Kankan crossed the top of the patrol car.

As the patrol car disappeared from the sight of the two people in the cockpit, Xu Qing did not correct the left roll attitude of the aircraft. He needed to maintain this attitude and let the aircraft correct itself naturally. He even had to slowly move the stick.

, so that the nose of the aircraft can continuously maintain level flight.

You must know that a single left landing gear is supporting it now.

Xu Qing's operation was very precise. The attitude of the aircraft nose did not change at all under his control. However, in terms of roll, the aircraft began to roll to the right involuntarily and returned to the normal horizontal attitude of the aircraft's large wings.

It's just that the recovery speed is much faster than expected. Even if Xu Qing has almost pressed the left pressure plate to the bottom, he still can't stop the right rolling trend.

When designing large passenger aircraft, certain stability considerations are taken into consideration. In other words, when the attitude changes in a small manner, even if the pilot does not intervene, the aircraft itself will tend to return to its original stable state. Therefore,

, it is natural that the aircraft will slowly start to roll to the right, and it is determined by the nature of the aircraft itself, but this recovery speed is unacceptable to Xu Qing.

There is no way. Inconsistent thrust and inconsistent flaps give the aircraft a natural self-propelled moment to roll to the right, and it is very obvious. It is much larger than the aircraft's own stability recovery moment. Xu Qing has actually used the throttle thrust

It was quite restrained, otherwise the plane would roll to the right even faster.

Xu Qing was almost using the minimum limit throttle to keep the aircraft rolling in a single landing gear state. However, when this state developed to a certain point, human intervention was beyond the control of the aircraft.

If the plane's No. 2 engine fails to start successfully later, he will know to increase the throttle in order to achieve a faster speed, so as to increase the plane's rudder surface effect and control the attitude of the plane's large wings.

However, increasing the throttle is equivalent to losing the directional stability of the aircraft, which will make the aircraft's taxiing extremely difficult to control. In order to maintain the single landing gear taxiing state, giving up the directional stability of the aircraft is actually a mistake.

Drink poison to quench thirst. But when that time comes, we can only tear down the east wall and mend the west wall.

"Is the No. 2 engine not ready yet?" Xu Qing saw that the aircraft's roll attitude had returned from left roll to close to the wing level. After a moment, it would change from wing level to right roll.

Now the aircraft is supported by the left landing gear, which has almost no support effect on the right roll. This means that as long as the aircraft has a relatively obvious right roll attitude, it is basically impossible to correct it. The right wing tip of the aircraft will be the first to touch the ground.

, followed by the No. 2 engine pod, and finally the belly of the fuselage.

The palm of Xu Qing's left hand holding the thrust handle of the No. 1 engine was slightly sweaty and sticky. At this critical moment, even a person like Xu Qing felt tremendous pressure.

When manpower is still exhausted, it all depends on God’s will in the end!

Lu Xinyu had already turned his attention back to the engine instructions at this time. He was also under tremendous psychological pressure, and his back was soaked. Lu Xinyu felt that this engine start should be the most thrilling start he had ever experienced in his life.

"Not yet, it's still starting!" Lu Xinyu said anxiously. For the first time, he felt why the engine started so slowly!

Now that the plane did not slow down and Xu Qing did not let him lower the landing gear, Lu Xinyu probably understood Xu Qing's plan.

The plane was taxiing too fast. It was about to reach the end of the runway in the blink of an eye. There was no time to lower the landing gear. The only way out was to go around again. Now that it had passed the obstruction of patrol vehicles and drones, there was no path on the go-around trajectory.

There are no obstacles. It’s just an aircraft with mediocre go-around performance. With a landing gear, it’s unclear whether the aircraft can be pulled up at the end of the runway.

It was strange that he had to lower the front landing gear, and Lu Xinyu suddenly understood.

Putting down the nose landing gear can indeed reduce a lot of trouble in controlling the nose of the aircraft, but that's all. Controlling the nose of the aircraft itself is not difficult, the real problem lies in the roll of the aircraft.

And if the front landing gear is placed together, then we can only hope that the No. 2 engine can complete the start in a short time. If it does not start in time, the single engine with one front landing gear and one left landing gear will

An aircraft with asymmetric flaps will definitely not be able to lift up before the end of the runway while accelerating the remaining runway. The only result they can get is to overrun the runway.

At least, if only one left landing gear is placed, they still have a chance to struggle.

What can be obtained by extending the nose landing gear is only a small reduction in control difficulty, but what will be lost will be the last possibility of a single-engine go-around.

Lu Xinyu secretly glanced at the attitude indicator. He found that the plane had completely leveled off, but the No. 2 engine still had not started. If he waited any longer, the plane would roll to the right. By then, the consequences would be irremediable.

.

By the floor-to-ceiling window of the lounge, Xu Xian could overlook the entire runway. He found that the plane ran wildly after overcoming the obstacle of the patrol car. Due to the viewing angle problem, he could not see the changes in the horizontal attitude of the plane, but he could see it from a high altitude.

You can see the changing area on the Z-axis of the aircraft.

When the aircraft touched down, the nose was still almost horizontal in the direction of the runway, indicating that the aircraft was still under the control of the pilot at that time, and Xu Qing's corrections to the aircraft were satisfactory.

Just after the plane passed the obstacle of the patrol car and rushed straight through the middle of the runway at a very high taxiing speed, the nose of the plane began to gradually veer to the right.

Xu Xian did not believe that Xu Qing, who was in the cockpit, could not understand that there was a problem with the direction of the aircraft's nose. However, in the following period, the deflection of the aircraft's nose was not alleviated at all, which shows that Xu Qing was not unable to see it.

The problem with the direction of the aircraft's nose is not the problem of being unable to solve it, which means that Xu Qingneng's control influence on the aircraft can no longer correct the deviation of the aircraft.

This is a pretty bad sign!

At least from the current point of view, the No. 2 engine has not been started yet! Otherwise, Xu Qing, who has two engines, cannot control the direction of the aircraft's nose well, then he is no longer Xu Qing, and he may be taken away.

"Xu Xian, why hasn't the plane slowed down? It's almost at the end of the runway!" Wen Jingshu next to her was an outsider in flying, so the question she asked was actually quite one-sided, but Wen Jingshu was right about one thing.

The plane is almost at the end of the runway!

Suddenly, Wen Jingshu exclaimed: "What happened to the plane?"

I saw that the aircraft, which was originally roughly on the center line of the runway, suddenly became extremely unstable. From a height, its taxiing direction was crooked, like a snake.

This kind of S-shaped taxiing direction usually only appears on low-level pilot students. It should never, never appear on people of Xu Qing's level, even if there is only one person on the plane at this time.

Left landing gear support.

Moreover, the attentive Xu Xian discovered that the plane's taxiing speed seemed to be faster than before!

"Damn it, come on!" Xu Xian's eyes twitched wildly: "It's the last minute!"

The only possibility for the current scene to occur is that Xu Qing, as a last resort, increased the thrust of the No. 1 engine in order to achieve a faster speed and increase the rudder effect, so as to continue to restrain the aircraft from rolling to the right.

However, once the thrust of the No. 1 engine is increased, the aircraft's directional control will become extremely unstable. Under such circumstances, even with Xu Qing's methods, he can still control it like a novice pilot student.

Viewed from a height, the plane's taxiing direction is sometimes to the left and sometimes to the right, but the overall trend is still to the right. Xu Xian even suspected that before that, the plane would go directly from the runway edge without going to the end of the runway.

The position was off the runway.

The method of increasing the thrust of the No. 1 engine can only buy a short period of time and cannot solve the actual problem at all. If the No. 2 engine has not been started during this period, then Xu Qing can only force the engine to increase with a single engine, otherwise

It will only run off the runway.

However, when there is no resistance from the landing gear, the rate of ascent is only about 200 feet per minute. Now with a left landing gear, it is still unknown whether the aircraft can be lifted up.

Of course, no matter what the probability is, you have to give it a try.

If you don’t pull up, you will just rush out of the runway. If you pull up, you are lucky and can still get up, which is a small life. If you don’t get up, then you still rush out of the runway, and the result will be the same. If you try, at least you can still get up.

There is a slight possibility of success.
To be continued...