Chapter 11 Thrust Attenuation

Jianchuan City has a special geographical location, with warm winters and cool summers. It is a place where many birds spend the winter. Moreover, the airport is already remote, so the number of birds is even greater.

The captain stretched out and saw the bird-repelling vehicle driving on the path at the edge of the runway. Firecrackers exploded in the sky from time to time. Looking at the posture, he was afraid that the crew had reported a bird strike just now, causing trouble at the airport.

Very anxious.

If there are too many bird strikes, in the worst case, the airport will be ordered to close. If Jianchuan Airport is temporarily closed by the authorities because of this, it would be really ridiculous.

Seeing that it would take a while, the captain simply pulled the parking brake, turned off the taxiing lights, pulled the seat back, and slumped in the seat, looking very comfortable.

As the cockpit became quiet, Xu Cang could feel that the plane's fuselage seemed to be shaking all the time, which was not caused by the engine running.

"It's windy!" The captain put his hands behind his head and lazily turned his head to look at the wind bag beside the runway: "The choice of this damn place is really unlucky. Just after the thunderstorm season, the wind season is here."

The co-pilot followed the captain's gaze and saw that the wind bag was blown straight and parallel to the ground and was still rotating, which showed that the wind direction was very unstable.

"It's not afternoon yet. When we return, won't it be windier?"

The co-pilot said casually, and instructions came from the tower: "Feiyu 6321, you can enter runway 23, correct sea pressure 1020."

The captain, who thought he would have to wait for a while, suddenly stood up, stepped on the parking brake, increased the throttle, and scanned the runway and final to confirm that there was no risk of runway incursion.

The co-pilot responded to the tower, turned on all external lights, turned on the terrain display on his side, pressed the test button of the weather radar, and turned TCAS to the TA/RA position.

"The five sides of the runway are safe, takeoff thrust is 93.5." The co-pilot opened his mouth, as if Xu Cang was not alone in being sleepy at work.

While the aircraft was aligned with the runway centerline, the tower control gave takeoff instructions.

"Feiyu 6321, surface wind 15012, gust 15 meters, runway 23 can take off."

"Runway 23 is ready for takeoff, Feiyu 6321!" The co-pilot raised his eyebrows a few times: "When we were preparing, there was only a steady wind of seven meters on METAR. How did it change so quickly?"

Although the captain and co-pilot were lazy before, once they were about to take off, the two of them completely calmed down and sat up straight.

When they were about to align, the captain pressed the timing button and started to push the throttle forward at the same time, saying: "The wind is a little unstable, pay attention to wind shear."

"Yeah!" the co-pilot responded, knocked on the handle of the side window, and finally adjusted the position of the seat to make himself more comfortable. Finally, he quickly scanned the take-off configuration to confirm that it was correct, and pay attention

When the thrust had stabilized at 40%, he no longer hesitated and shouted directly: "Good direction, the take-off thrust is stable!"

"Let's go!" The captain immediately pressed the TO/GA switch, and the two CFM56-7B24 engines roared into life. The power of up to 220,000 DaN pushed the fuselage weighing dozens of tons to continuously accelerate.

Xu Cang bent his head and stared boredly at the runway center line mark that was passing quickly in front of him. His ears were filled with the standard shouting of the captain and co-pilot. Although the content was roughly the same, there were still some differences in subtleties. Even in the standard operating procedures.

, there will be differences between each company.

Suddenly, Xu Cang felt the plane shake, and the taxiing direction changed. Xu Cang had not paid careful attention to the status of the plane. After all, he was not on a flight, so there was no need to be so diligent. Subconsciously, he

I thought it was caused by air currents.

As the speed of the aircraft increases, the rudder surface effect of the aircraft becomes stronger and stronger, and the impact of turbulence on the aircraft begins to become obvious.

However, I thought it was just a small incident, but unexpectedly, the plane's taxiing direction began to become more and more unstable.

"Huh?" Suddenly, the co-pilot noticed some fluctuations in the thrust of the No. 2 engine. However, he hesitated for a moment, because the thrust of the engine was not constant, and changes in a very small range were normal.

However, after a moment of hesitation, the thrust of the No. 2 engine suddenly dropped from the preset standard thrust of 93.5 to 91. A one percent change in N1 speed is acceptable, but if it dropped so much all at once, it was obviously a problem.

problematic.

The co-pilot stopped waiting and immediately reminded the captain: "Brother, the thrust of the No. 2 engine is abnormal."

Just as the co-pilot was talking, the thrust of the No. 2 engine suddenly dropped from 91 to less than 80. At this time, there was a significant thrust difference between the two sides of the thrust, and the already unstable rolling direction worsened instantly.

.

"Not good!" The captain spared his energy and quickly took a look at the upper DU's engine display, and immediately locked on the abnormal N1 of the No. 2 engine.

As a controller, most of his energy was spent outside during the take-off phase. Just like Xu Cang, he thought the plane was turbulent because of airflow, but now it seems that it may be caused by engine failure.

Caused by unstable thrust.

At this time, the aircraft's speed has exceeded 80 knots. After that, only engine failure can meet the conditions for aborted takeoff. But now that the thrust of the No. 2 engine continues to decline, does it meet the conditions?

In this case, the engine seemed to have failed, but it did not fail completely! This kind of ambiguous situation is the most annoying. Perhaps it was because he had never encountered such a situation before, and the captain was a little undecided for a moment.

.

The decision to abort a takeoff can only be made by the responsible captain. The co-pilot was nervous and waiting for the captain's decision. Suddenly, the cockpit fell into an eerie silence.

Although the captain hesitated, he did not give up control of the aircraft at all. Even when the thrust of the No. 2 engine continued to decline, the aircraft's taxiing direction was still stabilized.

Moreover, the captain's hesitation did not last long. In just over a second, he made a decision: "Abort!"

A reaction time of one second is not a prompt decision, but it is definitely not an excessive performance.

But the moment he shouted abort, the co-pilot was ready to cooperate with the captain in aborting the takeoff. However, there was a roar behind them: "Continue, V1!"

One second, no more than two blinks of time, but within one second, the aircraft increased its speed by six knots, directly exceeding the speed of V1. However, this aircraft did not have an electronic message from V1, and the co-pilot was disturbed by the abnormality of the engine.

I was so focused on it that I didn't even notice that the speed of the aircraft had exceeded V1.

Only Xu Cang from behind saw it! So, he spoke!

At this moment, the captain showed a different decisiveness than before. He didn't even verify Xu Cang's words himself, and stopped his movements with his right hand on the throttle lever.

He did it!
Chapter completed!