With the EEC hard standby mode activated, the two LEAP-1B engines burst into even more powerful roar and pushing the limits.

Xu Qing held the tightly, the tiger's mouth was slightly white, and he found that the plane was like a heart booster, struggling to cross the mountain.

"Second EGT!" The second EGT is clearly starting to rise above the first EGT in the back, while also continuing to rise. Using the hard standby mode can indeed exceed the usual limit speed when the thrust is at its highest, but it is very easy to cause the EGT to overheat. Today, the first-engine EGT has increased slightly, but it is still within the limit, while the second-engine EGT has risen significantly and is close to breaking the normal range.

EGT overtemperature can cause damage to engine components such as combustion chambers, turbine blades and tail nozzles, which is quite dangerous.

Xu Qing subconsciously glanced at the upper DU shown by the engine data, and at the moment when he turned his head to look, the temperature of the EGT had exceeded the maximum limit, and the data display of the second EGT had turned red. Even if the EGT drops below the limit, the red display will not disappear.

When he switched to the regular instructor, he didn't even look at the engine data display when he heard the question of the second EGT in the back. When he chose to use EEC hard standby mode, the EGT overtemperature was predictable.

What about EGT over-temperature? Is it possible to retract the throttle now? Now there is no turning back from the bow, and there is no reason to give up halfway! As for whether there will be any damage to the second shot in the back, it will have to wait for them to cross this mountain.

At the moment when Xu Qing withdrew his gaze, with a violent shaking, the fuselage of Blue Sky 9433 narrowly avoided the mountain. However, there was a towering protruding rock block on the right wing of the plane, and the fuselage avoided the hill, but the wing did not, and the fierce burst came from this.

The right wing of the plane was scratched by the protruding rock, and the nose of the plane was violently deviated to the right.

After waiting for the plane to stabilize, Xu Qing's shirt on his back was soaked, and his breathing was still trembling slightly, and the ecstasy of the rest of his life after the catastrophe had not eased up until now.

"There's one more!"

When Xu Qing breathed a sigh of relief, Teacher Chang stopped Xu Qing's lax mood in time, and after crossing this mountain, there was another one behind.

Xu Qing continued to play the trim, and then stopped adjusting the trim to the normal position after using the main electric trim.

A few seconds after Xu Qing released the main electric door, the trim wheel began to play trim forward again. This time Xu Qing has experience, at the moment when the trim wheel began to rotate, Xu Qing pressed the main electric trim, and the trim wheel stopped rotating at the same time, and according to Xu Qing's action, it became a trim backwards.

Since the trim was already within the normal range, Xu Qing just stopped the wrong automatic trim and released the main electric trim door.

"The stabilizer is out of control?" A strange look.

"It's not! The stabilizer is out of control and will not be leveled for a while, and it will not be balanced for a while, and the loss of control of the stabilizer is an irregular and continuous balancing, which is not the way it is now. There is a microcontroller in the stabilizer electric motor, which receives the main electric trim command on the steering wheel or the speed trim command or automatic driving trim command of the FCC (flight control computer), and then controls the movement of the electric motor body, so that the gearbox and screw rod move and finally drive the stabilizer to move up and down. One possible scenario where the stabilizer moves uninstructed is caused by an error in the controller. However, even then, it is rare that the reverse operation does not inhibit the trim. The first memory item of the stabilizer out of control is to keep the steering stick firmly, which is to trigger the steering stick to cut off the electric gate through the reverse operation of the steering stick, so as to avoid putting the aircraft into a dangerous pitching state. If it is useless to cut the electric valve with the steering stick, then there must be other reasons. Teacher Chang analyzed: "However, no matter what the reason is, there must be a problem with the trim now, and the trim gate should be cut off." ”

Whether it is the stabilizer out of control, or other deep-seated reasons, the source of everything is this uncontrolled balancing, which the regular instructor can no longer bear.

"Master...... Good! Xu Qing hesitated for a moment, but decided to follow the instructions of the regular instructor and cut off the stabilizer trim.

The stabilizer trim cut-off gate of the MAX is different from that of the NG, where the stabilizer trim gate is divided into main trim cut-off and autopilot trim cut-off, while on MAX aircraft, the stabilisation trim cut-off gate is divided into primary cut-off (PRI) and standby cut-off (B/U). The two stabilizer cut-offs are in series, and cutting off either of them will cause the stabilizer motor to lose power, so that manual trimming can only be carried out.

The reason why Xu Qing wants to stop talking is that manual balancing is too laborious, and the front and rear steel cable drum wheels are manually moved by rotating the handwheel, and the rear steel cable drum wheel moves the gearbox and the lead screw, and when the lead screw moves, the horizontal stabilizer moves. The rotating handwheel is hidden in the card slot of the trim wheel.

Manual trim has a higher priority than any other trim and has the largest trim range, even exceeding the largest main motor trim range, which can reach -0.20 to 16.9 units.

"Master, I'll try first!" Xu Qing took out the rotating handwheel and said to Instructor Chang that he wanted to try how powerful the rotating handwheel was.

Instructor Chang was stunned for a moment and nodded: "You try, I'll deal with the second overtemperature." ”

The second EGT overtemperature has just been triggered due to the use of the maximum thrust in EEC hard standby mode, and now it must be disposed of.

EGT overtemperature is a memory item and belongs to the "Engine Overrun, Surge or Stall Checklist". Instructor Chang is naturally familiar with it, and begins to retract the throttle slightly back of the second engine, and at the same time observe whether the second engine EGT has dropped.

He didn't dare to collect too much, and there was a second mountain soon, if he collected too much, it would be no different from a single shot, and the difficulty of crossing the obstacle would rise sharply.

Just as Instructor Chang was dealing with EGT overtemperature, Xu Qing began to spin the handwheel for the first time, which was the first time he had ever played manual trim on a flight.

The moment Xu Qing was struggling, he knew that this thing was unreliable. made the effort to eat, but the trim wheel only turned half a turn, if it weren't for the rattling wheel just now, Xu Qing even suspected that the trim wheel was stuck.

Xu Qing shook off his somewhat sore hand, and exerted himself again, Xu Qing's entire face was red before he could finish the trim rotation.

It took a lot of strength to turn around and have a fart? Just now, whether it is the main electric trim or the automatic trim is a tumultuous turn, he manually rotates the speed adjustment of the handwheel, and the trim corrected per second is estimated to be only the lead rate just now, so his manual trim, with and without, what can be the difference?

Read the URL: