It is true that the area near Shangdu Airport does not have towering mountains like those in the southwest. Most of the area nearby is plain, but the prerequisite is to cross the Qinling Mountains. Chen Qi only remembered the vastness of the Central Plains, but forgot that the thousands of miles of Qinling Mountains stood in front of him.

Based on the state of the Chimelong 5677 aircraft, the maximum thrust reduction of 56% that a single engine can maintain cannot allow the aircraft to maintain cruising status. Even after Xu Xian restarted the No. 1 engine, the aircraft continued to lose altitude.

Looking at the suffocating black shadow in front of him, Xu Xian felt a chill in his heart. With the current state of the plane's continuous loss of altitude, it was really unknown whether it could cross the Qinling Mountains!

"Are we still going to Shangdu Airport?" Chen Qi swallowed and looked around. There was no end to the Qinling Mountains. It was impossible to bypass the Qinling Mountains.

The Qinling Mountains are a total of 1,600 kilometers. Even if the two engines are normal, it will take a lot of effort to get around.

Most of the heights in the Qinling Mountains are close to three thousand meters. No one dares to guarantee whether they can survive until they cross the Qinling Mountains.

Moreover, even if we are separated from the main body of volcanic ash, our field of vision is still unclear. When crossing the ridge, how can we visually avoid all the towering objects?

All of these may be the path to death!

Xu Xian looked troubled. If possible, he would never want to go back to Anning Airport.

The clearance environment around Anning Airport is too poor, and the glide angle in the final stage is not the conventional relatively smooth three degrees, but a steep 3.5 degrees. If it is just a problem of the glide gradient, that would be okay. The terrible thing is that Anning Airport

The final localizer is not even in the same direction as the runway. It

There is a full three-degree angle between the final localizer and the direction of the runway, which requires the pilot to make corrections at low altitude. However, in the case of a single engine, the maneuverability of the aircraft is inherently limited, not to mention that the only working

The engine can only operate with reduced thrust, which further reduces the aircraft's maneuverability.

The reason why there is such an embarrassing design is entirely because there is a raised mountain top three nautical miles away from the five sides. If the localizer is designed normally and is consistent with the direction of the runway, then it will inevitably cause a terrain warning when it is three nautical miles away. Helpless

, we can only create a more inclined heading path.

In fact, Xu Xian never understood. It was just a hilltop, and with a little "magic workmanship", wouldn't it mean that everything would be fine?

As a result, there is now a three-degree deflection!

Moreover, the five sides of Anning Airport are basically flying in the ravine, and if you are not careful, you will hit the mountain.

Unless it was absolutely necessary, Xu Xian would not be willing to use such a "half-dead" aircraft to go into the ravine.

"Wait a minute, wait a minute!" After taking over the control, Xu Xian showed an anxious expression for the first time. Even when both engines were turned off, Xu Xian didn't look like this.

Chen Qi: "What are you waiting for? You can't calculate our height to the Qinling Mountains, so you just pass by. If it is during the day, you will risk passing by. What are the visual conditions outside now? Do you dare to pass?"

In the terrain display, they can see the approximate location of the Qinling Mountains. Through the speed and descent rate, they can calculate what the altitude of the aircraft should be when it reaches the position over the Qinling Mountains.

Chen Qi calculated the height a little and found that the height when he reached the Qinling Mountains was just over 10,000 feet. Most of the peaks in the Qinling Mountains were around 3,000 meters, which was very close to 10,000 feet.

If it were during the day and there was sufficient visual field, it would be possible to avoid flying around visually. Now, it is at night, and the large amount of volcanic ash in the air makes the already limited field of view even more stretched. To do this

Under such circumstances, Chen Qi would never agree to risk his life by crossing the Qinling Mountains.

"Then you take control, you go to Luo An Ning!" Xu Xian was annoyed by Chen Qi's behavior of being right. Who doesn't know how to slap the upper and lower lips a few times? With the current situation, there are people who can cross the Qinling Mountains.

Is it dangerous, Chen Qi knows? But compared to climbing over the Qinling Mountains and landing at Anning Airport like a gamble, Xu Xian feels that the risk factor is greater.

You know, Anning Airport is an airport built by flattening a mountain. Except for the road going down the mountain, it is surrounded by deep valleys.

Even if the landing at Shangdu Airport does not land on the runway for some reason, there is still a large plain around it for an emergency landing. At least there is a glimmer of hope.

Once Anning Airport does not land on the runway, the nearby mountains and ravines will be a dead end.

Fortunately, Anning Airport is relatively close. If it were further away, Xu Xian and the others wouldn't even have time to think about it.

Chen Qi immediately understood the meaning of Xu Xian's words: "Are you not sure that you will end up in An Ning?"

Xu Xian pursed his lips and said nothing.

"Holy shit!" Chen Qi instantly became irritable again. When both engines stalled, Xu Xian did not behave in such a negative manner. It could be seen that landing at Anning Airport seemed to put a lot of pressure on Xu Xian.

"Wait a moment!" Xu Xian's eyes were extremely sharp: "Now that we are out of the main body of volcanic ash, the ionization reaction has weakened, and we may be able to contact the control immediately. I need their opinions!"

"Ionization? What ionization?" Chen Qi seemed a little confused about Xu Xian's words.

"Holy...forget it! Try calling for control right now."

Chen Qi's "amazing" theoretical knowledge reserve opened Xu Xian's horizons.

Instead of wasting time giving live lectures to Chen Qi, it is better to spend some time considering whether to climb the Qinling Mountains or settle down in peace!

…

Shangdu Regional Control Office.

The director of the control room looked at the red diamond mark on the radar screen, with a gloomy and scary expression on his face, and asked: "When did the emergency code go up?"

"Just now!" the controller said quickly.

"Were there any signs before? Or did the crew ask for help or explain what the problem was?"

The controller quickly shook his head: "The Chimelong aircraft took the initiative to call me before, but the signal at that time was extremely poor. When I contacted Chimelong's crew later, the crew did not reply. Later, I asked a nearby aircraft to relay it on my behalf, but there was no reply.

reply."

"Did you call on the emergency frequency?" the director asked.

"After the Chimelong aircraft hung up the emergency code, I called them on the emergency frequency, but there was still no response."

If the plane cannot be called for a long time, the controller will try other methods and will not just use the same method stupidly. However, after trying all methods, Chimelong's plane is still out of contact.

"That's not a radio failure? Then why did the emergency code go up?" The director couldn't figure it out.

The codes for radio failure and emergency codes are different. According to the controller, isn't this a problem with the communication system?

"Flight information!" the director asked.

The controller immediately called up the flight information: "Chimelong flight 5677, destination Qinghu."

"Where's the flight path? Where's the altitude?"

"Director, I will project the information onto the main screen." After the controller finished speaking, he projected the Chimelong aircraft's flight data onto the main screen.

In an instant, Chimelong 5677’s trajectory, altitude, and speed change information were all displayed on the main screen.

The director only took a few glances and noticed something strange about Chimelong 5677.

"They took the initiative to turn six nautical miles to the right?" the director said to himself.

"Yes, right after hanging out the emergency code!"

The director immediately grasped the information: "Then it's not that there's a problem with the communication system, there must be something else."

Communication systems do not need to be off-route.

"You said you haven't contacted Chimelong's aircraft, so the descending operation was their autonomous operation." The director's mind was racing: "The problem of descending is most likely a pressurization problem, or... a power problem

.”

The problem of pressurization is reduced in order to keep the cabin altitude below 10,000 feet. Not to mention the problem of power. Without power or power damage, it will be impossible to maintain normal cruising at high altitudes.

"Their rate of decline was very fast at first, and then began to decrease continuously. It doesn't look like an emergency decline." The director analyzed.

Once the pressure is released sharply and you make an emergency descent, you must descend quickly in the shortest possible time. There is a saying that the descent is fast for a while and slow for another time.

After rejecting the possibility of rapid pressure relief and emergency descent, the director became puzzled again: "Isn't it like a single engine drifting down? The initial descent rate is too high! And it shouldn't be maintained at seven in the case of a single engine.

The height is from 1,500 to 7,800? Why is it only 6,000 now? It’s still falling? It’s unreasonable!”

The director is different from other controllers. He has some professional flight knowledge and knows what the maximum altitude of a single engine is. Because of this, he wonders why Chimelong's aircraft is now far lower than the normal single-engine altitude.

The cruising altitude is still falling, which makes no sense!

"Could it be that there is a problem with both engines?" The director could only think of this possibility. However, the low descent rate maintained now should not be achieved by stalling both engines.

Even if the director's level is higher than that of ordinary controllers, he would never have imagined that one engine would stall and the other engine's thrust would be limited!

"What's going on?" No matter how experienced the director is, he still can't figure out what happened in Chimelong 5677.

What they fear most is not knowing what happened.

Just when the director was extremely distressed, a few silly laughs came from not far away. The director turned his head with a black line on his forehead and said impatiently to a figure in the corner: "I've said it several times! Don't do it.

Can you be a little more serious when eating and watching videos in the workplace?"

The old controller who was named by the director wiped his mouth in embarrassment and pointed to the tablet that was still playing the video: "The Internet said that it was raining black rain over Shou'an. I'm just curious."

The director was startled: "Shou'an?"

He suddenly looked back at the home screen. Isn't Shou'an near the Chimelong 5677 aircraft?

"Black Rain?" The director's heart skipped a beat, and he quickly walked to the old controller and glanced at the news content.

It’s not even news, it’s just a video reposted by some internet celebrity accounts. In the video, a person reaches out to catch the rainwater. When the camera is zoomed in, you can see that the rainwater is mixed with a lot of black impurities.

"It can't be volcanic ash!" The director suddenly had a very bad thought in his mind.

The controller who came over interjected: "That shouldn't be the case! There have been early warnings about large-scale volcanic ash. How is it possible that there is no news yet?"

"What else could it be?" The more the director thought about it, the more reliable his guess became: "When the plane passes through the volcanic ash, it will produce a strong ionization reaction on the surface of the aircraft, cutting off radio communications. This is why Chimelong 5677 has been unable to be contacted.

The reason. Moreover, volcanic ash will cause huge damage to the aircraft engine, and engine stalling is foreseeable. This is why Chimelong 5677 clearly has communication difficulties but hung up the emergency code! There must be an engine problem!"

The small gravel in the volcanic ash poses a huge threat to the engine. If the aircraft really enters the volcanic ash, the engine will suffer serious damage if you are not careful.

Moreover, according to the decline pattern of Chimelong 5677, there may be more than one engine problem.

"Go and contact the meteorological department and confirm..." Although the director doesn't quite believe that the meteorological department would make such a low-level mistake, he still has to confirm it, just in case...
To be continued...