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date="2021-10-04"

title="chapter eight"

weight="139411"

series = ["UAAG Air Crash Investigation Team"]

mode = "manual"

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Pilots control an airplane, unlike riding a bicycle, which can be achieved by correcting the handlebars and pedaling.

Airplanes are undisputed behemoths.

Even a small flap weighs tens of kilograms, which is difficult for ordinary people to shake.

Then the pilots control the aircraft, of course, not by brute force, but by a complete control system.

A hundred years ago, this system was realized by the simplest pulleys and steel cables, using the principle of leverage, and was called a mechanical system.

After that, it became a hydraulic system. Through the hydraulic pump, the human power is amplified to realize the control of the aircraft. For example, the pilot can only use 1 Newton of force, but the hydraulic pump can magnify it hundreds or thousands of times, so that it can control this behemoth.

Now, with the development of computers, the telex system has gradually become the mainstream.

The telex system allows the computer to control the aircraft.

This view is still controversial in the industry.

Whether it should focus on pilots or computers, the major aircraft manufacturers have their own focus and debate.

But there is no objection that they all use the telex system on the new aircraft.

Maifei F435 uses a telex system.

The fly-by-wire system includes all aspects of the aircraft. The computer can control the aircraft's take-off and landing, the change of the rudder angle, and the size of the engine.

Since EASA confirmed the cause of the "four-engine stall" accident, they first ruled out the two causes of fuel exhaustion and weather. What they suspect next is not the human factor, but the telex system.

Computers can make mistakes.

A computer error, shutting down four engines at the same time, is the most likely cause of the accident.

But now Zhuo Huan told him to check the engine.

Check the engine related to the fly-by-wire system, not the fly-by-wire system related to the engine.

The engine is the main body, and the fly-by-wire system is the secondary.

This decision is puzzling.

As Fucheng said, this is the case of four engines stalling together.

If there is a problem with the engine itself, how could all four of them go wrong together. But now Zhuo Huan asked them to check from the engine, everyone thought it was incredible, but they had no choice but to check from the fatigue of the metal.

Metal fatigue.

Metal materials will experience structural damage after repeating the same task for a long time.

Quantitative changes produce qualitative changes, and when fine cracks and damage accumulate to a certain extent, fractures will occur.

The previous investigators did not conduct a detailed inspection of the engine, so it is very likely that the damage to the engine parts caused by metal fatigue was mistaken for the explosion after the crash.

What everyone has to do now is to find out every key part and inspect it in detail to determine whether they were damaged before the crash or after the crash.

This is a physical exercise.

Everyone checked together for a whole day, and only one-twentieth was checked.

At this time, the black box was sent over by McFly.

The moment Su Fei saw the black box, with tears in his eyes, Su Fei ran up excitedly: "Is this for me?"

Old Joseph was dumbfounded: "Look at it for you."

Su Fei was so happy, he followed the staff and sent the black box upstairs, then ran down to Fucheng and said, "Brother, sorry, I want to leave you alone. I'm going to do another great cause. Don't worry. Well, when I fix the black box, I can prove that what RIP said is wrong and save you from the sea of ​​misery."

Fucheng smiled and said: "Okay, I'll wait for you."

Su Fei suddenly felt that he was carrying the hope of the whole village to defeat the Great Devil, and returned to the second floor with a lofty heart. When he left, he kicked in Zhuo Huan's direction, and Fu Cheng opened his eyes wide in surprise. After Su Fei left, he turned his head and looked in the direction Su Fei had just kicked.

That person is not like a big demon at all.

Wearing a white T-shirt and a black jacket tied around his waist. The long hair was struck back by the owner a few times, and it was pulled a little. He is holding a flashlight in his right hand and a metal fatigue detector in his left hand. He sits on a high stool inside the No. 1 engine. The beam of the flashlight is directed upwards, carefully inspecting every part of the upper part of the engine.

He was extremely focused, as if there was a water curtain separating him from the noisy voice of the outside world.

There seemed to be light in that eye.

Fucheng looked away calmly.

The repair of the black box was more difficult than Su Fei imagined.

In fact, if the black box is so well repaired, it will not take a few months for McFly to complete the repair.

Twenty-three days later, the metal fatigue appraisal of the engine was completed, and no metal fatigue was found.

On the other hand, the black box has not been repaired yet.

It took 23 days to check all four engines from the inside to the outside, but nothing was found. Several people at UAAG did not have any opinions, but investigators from other organizations had private opinions.

When Fucheng poured water from the pantry, he heard an EASA investigator whisper to his companion: "Although Mr. Patrick is a recognized genius aircraft designer in the industry, this is an accident investigation, not an aircraft design. This is his first time. Participate in the aircraft accident investigation for the second time. There is no experience at all and more than 20 days have been wasted."

"To be precise, this can be regarded as his first time. In the Rogue Air crash four years ago, the black box had not been caught in the sea all the time. After more than three years of investigation, no clues were found."

"It's not that I disrespect Mr. Patrick, but maybe he is more suitable for building airplanes than investigating air crashes... Uh..."

Fucheng walked in front of the two with a cup of water.

One of them hurriedly said: "Fuck, don't get me wrong, we don't mean that."

Pausing, Fucheng turned around, looked at them, and said in a calm but firm voice, word by word: "He is Reid·Irvin·Patrick."

When the words fall, take a step and leave.

Behind them, the two EASA investigators froze in place and made no sound.

The black-haired young man took a few steps with his water glass and walked to the corner when suddenly he stopped.

For a long time, Fucheng's voice was calm: "Teacher Zhuo."

Holding a cup of coffee in his right hand, Zhuo Huan gently leaned his back against the wall. He lowered his head to take a sip of coffee, turned his head, and looked at Fucheng. "You seem to always have this expression."

"Teacher Zhuo?"

"Calm, peaceful, not sad or happy." Standing up straight, Zhuo Huan thought for a while, "Polite and estranged when smiling, and standing there like a statue when not smiling. Oh yes, a bit like that."

Fucheng looked in the direction of his fingers.

Lina is a standard French, very romantic and ritual. Even if she went to work in a foreign country temporarily, there was a SEEROSE eternal flower bear on her desk. The pink rose bear is concealed in a glass cover, tied with a black bow.

Withdrawing his gaze, Fucheng: "I don't understand what you are talking about, Teacher Zhuo."

Zhuo Huan glanced at him deeply.

for a long time.

Mr. Longlegs stepped away from his legs and gave orders: "Let's go, go downstairs and have a look."

At night, the staff all went back to the second floor to sort out the metal fatigue materials checked before. The first floor was empty with only four huge engines.

Confidential parts were everywhere, and when the two went downstairs, they threw the disposable water cup in their hands into the trash can to prevent accidents.

As he walked, Zhuo Huan said: "Excluding weather and human factors, do you think if it is a flight system error, what is most likely to go wrong?"

"Telex system."

"So firm?"

"Yes." Fucheng added: "You just said that it is most likely, not 100%."

"What if it must be an engine?"

Fucheng raised his head and looked at him, finally showing a puzzled look: "Why does it have to be an engine?"

Zhuo Huan pointed to his brain: "Intuition."

Fucheng: "The current monitoring result is that no part of the engine is damaged. Except for the damage caused by the explosion after the crash, it is intact."

Zhuo Huan said to himself: "On January 17, 2008, when British Airways Flight 38 landed at Heathrow Airport, the four engines stalled together and finally made a forced landing on the lawn in front of the runway. Fortunately, no one Death. The subsequent investigation revealed that the reason was that the engine’s heat exchanger was poorly designed. When the aircraft flew over Russia, the temperature was too low. The moisture in the fuel condensed into ice, and the ice slag blocked the oil pipeline. The engine had no oil and would naturally stall. ?"

Fucheng nodded.

He used to be a pilot, but after he was transferred to UAAG a month ago, he made up a lot of accident investigation data. The accident of British Airways Flight 38 is also within his reading range.

Fucheng: "Because the accident was caused by icing. After the plane crash, the ice melted into water and disappeared. So it caused a great obstacle to the investigation process. It took AAIB 8 months to find out the truth. ."

Zhuo Huan: "Are you familiar with it?"

Fucheng was taken aback.

Zhuo Huan laughed, with a loose voice: "It's very similar to this time. Also flying over the Arctic Circle, the water will disappear, so no murderer can be found. This time the murderer also disappeared bizarrely."

There was a hum, and it hit Fucheng's mind.

This face, described as a statue of an immortal flower, finally showed colorful emotions. He hurriedly said: "You mean, it's also a water problem this time?!"

"Have I said that?"

Fucheng was stunned: "Teacher Zhuo?"

Zhuo Huan did not answer, but suddenly asked: "What were you looking at when you stroked the charred land at the initial impact point at the crash site a month ago?"

Fucheng opened his lips slightly.

"Or, what did you see?"

The falcon-like gaze shot straight over and forced into the dark-haired young man's eyes.

Zhuo Huan had an imperceptible smile on his mouth, but the smile didn't reach the bottom of his eyes, he scrutinized the black-haired young man in front of him. Unable to tell what kind of look it was, Fucheng felt a glimmer of hope and desire from it.

This man seems to be expecting something, what kind of answers he expects, and then use his answers to prove something.

What is it?

After pondering for a long time, Fucheng: "Speak out, can you not laugh?"

Zhuo Huan didn't expect this answer at all: "What?"

Fucheng looked at him seriously, and said again every word: "Can you not laugh?"

"……Um."

Fucheng: "I feel it's its fault."

"he?"

"It, McFei F435...that plane."

Zhuo Huan: "..."

Fucheng: "You said you didn't laugh!"

Zhuo Huan covered his cheek: "Am I smiling?"

Fucheng: "..."

His face gradually became hot and hot, and Fucheng regretted it, why did he answer this answer, make up anything, or ignore the man's question as he did a month ago. The only thing he was grateful for was that it was night and there was no light on the first floor, and the moonlight could not show his reddish cheeks no matter how bright it was.

The irritation in his heart gradually turned into anger, but just before that anger was about to erupt, a hand that was so cold that it almost made people feel lonely gently pressed his head.

Fucheng slowly raised his head.

Zhuo Huan rubbed his hair, then curled his fingers and flicked on his forehead.

"Thank you, I like this answer."

The man walked around him, turned and walked upstairs.

Halfway through, Zhuo Huan stood in the middle of the stairs and turned his head to look at Fucheng: "Su Fei explained that the black box can be repaired in the day. Do you want to know the answer?"

That month Guangming was not bright enough, but it illuminates the man, and also illuminates the young pilot standing under the stairs.

Fucheng couldn't help but stepped up the stairs and walked to this person's side.

The black box repair was completed the next day. Su Fei imported all the flight data into the computer. He was about to sort out the data in detail. Zhuo Huan interrupted him: "Listen to CVR first."

CVR, the cockpit voice recorder, records all the sounds on the plane.

On the second floor of the investigation headquarters, dozens of people tensed their backs, waiting for the final answer.

Su Fei nodded, and he began to import the data in CVR.

In an instant, hundreds of sound fluctuation curves appeared on the computer screen.

Zhuo Huan: "Use Fourier transform to strip out the sound in the cockpit. I want to hear what the pilot said and the instrument prompts in the cockpit. For the time being, I only listen to the last thirty seconds."

Half an hour later, the sound of 30 seconds before the JAL JL917 crashed slowly sounded from the speaker.

"Confirm that the throttle is tightened."

"It has been confirmed that the throttle is tightened."

"Flaps open 30 degrees."

"The flaps have been opened 30 degrees."

"Preparing to put down the landing gear... Wait, I suddenly lost thrust."

"Check the engine switch."

"The engine switch is turned on."

"What about the throttle?"

"Four engines stalled, ah, soon, it's going to crash!"

"Ah, get up, pull up!"

A harsh sirens sounded, and McFei F435’s collision warning system announced over and over again in a cold voice—

"GLIDE SLOPE! GLIDE SLOPE! GLIDE SLOPE!"

"Ah ah ah ah, it's going to hit!"

"boom"

The investigation headquarters was silent.

No one knew how long it took, and a cold and thin voice sounded.

Zhuo Huan: "Jal Airlines JL917 crash accident, confirmed to exclude human factors."