And Yu Fengtian, who was on the periphery, almost collapsed to the ground when he heard the news that Xu Cang could neither see nor hear. This was not basically a death sentence for the plane. If the plane crashed, it was finally found that the source of everything was the S2 switch.

If it is caused by defects, then it is not as simple as just submitting his resignation.

On the other hand, Ye Xian had a look of surprise on his face, while Li Rongcheng had no expression on his face, and he didn't know what he was thinking about.

As if he had caught a glimmer of hope, Luo Yong quickly said: "Xu Cang, you instruct the flight attendant to adjust the automatic driving. Is she okay?"

This time the frequency was completely quiet, which was so weird that it made people feel a little scary.

Suddenly, a cold voice sounded on the frequency: "You want me to hand over the entire plane to a flight attendant who knows nothing? Do you believe her, or do you believe in the automatic landing function of the 747?"

In fact, Xu Cang once considered letting Xia Shuyue control the plane on his behalf. After all, autopilot can still be used. However, after thinking about it, Xu Cang rejected the idea. Not to mention whether Xia Shuyue could understand his command.

, he has not even prepared for the approach yet. If he wants to approach with autopilot, he not only needs to adjust the MCP board, but also set the localizer, decision altitude, navigation frequency, etc., and he has not had time to do these.

If any one of the links is wrong, the plane will definitely die. Xu Cang can't see it now, so he can't verify whether Xia Shuyue did it right. The risk is too great, and Xu Cang has already regarded it as impossible.

Moreover, another reason Xu Cang objected to letting Xia Shuyue come was the poor automatic landing function of the Boeing 747. If Xia Shuyue came for the approach, it would definitely have to land on autopilot in the end, but as far as Xu Cang knew, the 747-

The automatic landing of the 400 is not perfect yet and needs to be updated many times before it becomes relatively reliable. How could Xu Cang place his hopes on an unreliable automatic landing function.

Luo Yong shouted: "Then how can you land? How can you land if you can't see it? Not to mention leveling, you can't even guide the plane to the runway!"

After waiting for a while on the frequency, Xu Cang replied again: "So, I need to fly according to the standard approach procedure, and I will use vertical navigation to guide the aircraft to the runway."

"No!" The shout came from Director Liu, who took Luo Yong's microphone and said: "Xu Cang, do you mean RNP APCH? But the PBN operation is still in a testing state, and the regional navigation routes on the route are not complete.

Let go, let alone the RNP1 part of the approach phase. Xu Cang, our airport does not have RNP procedures. If you want to fly with vertical navigation, safety cannot be guaranteed."

"It's okay!" Director Liu's voice was so loud that Xu Cang could understand it without Xia Shuyue's paraphrase: "Even without the RNP program, FMC will calculate and simulate a descent profile during the final approach stage. We

Just press that to fly.”

"However, that has not been verified." Director Liu obviously knows some cutting-edge PBN technology: "The descent profile calculated according to B-VNAV does not match the blind descent slide, and is greatly affected by temperature.

It is large and poses terrain risks.”

"It's okay, it's safe!" Xu Cang's attitude was extremely firm.

Of course he knew it was safe, because Boeing verified this technology for a full ten years and only promoted it to the world after confirming its absolute safety, namely the RNP APCH commonly used in later generations and the further quasi-precision RNP AR technology.

However, this technology is now in the testing stage around the world. It was only two years ago that Europe tried to use basic area navigation technology for the first time, and China has only tested PBN technology on a few routes.

For example, the point P554 given by Qianzhou Control just now is positioned by PBN technology.

Traditional routes use navigation stations as the positioning method. Due to the necessity of navigation stations, the airspace utilization of the route will be greatly restricted. PBN technology uses the WGS84 coordinate system as the navigation method and defines a waypoint by longitude and latitude.

, so that you don’t have to be restricted by the navigation station.

In this way, the utilization rate of airspace will be greatly improved. Of course, in this era, few people can understand this technology, and it is rare for Director Liu to know a little bit about it.

"This" Seeing Xu Cang's extremely determined attitude, Director Liu didn't know what to say, so he had to look at Luo Yong and ask for his opinion.

Luo Yong gritted his teeth and took the microphone: "Xu Cang, even if you can guide the plane to the runway, how can you level it? This approach method cannot lead to automatic landing."

The automatic landing can only be continued in the blind landing approach, so the final leveling action still cannot be completed.

"I don't plan to use automatic landing." After waiting for a while, Xu Cang's attitude became even more unshakable: "I will use vertical navigation to guide the plane to the runway. As long as it is guided there, I can land. That's it.

!”

"Damn it!" Luo Yong inserted his hands into his hair. He felt a splitting headache. Xu Cang was as smelly and hard as the stones in the latrine.

However, Li Rongcheng's eyes flashed in the back. He did not expect Xu Cang to be so familiar with PBN, an extremely cutting-edge navigation technology. This is quite rare.

At this moment, in the cockpit, Xu Cang threw away the earphones, took a long breath and confirmed with Xia Shuyue again: "Remember the airspeed, altitude and heading I taught you just now, do you know where it is?

?”

"Yeah, I know. The airspeed indicator is on the left, the altimeter is on the right, and the heading indicator is at the bottom. It's like a compass. I remember." Xia Shuyue nodded.

Xu Cang breathed a long sigh of relief. This was the limit that Xia Shuyue could understand. It took Xu Cang a while to let Xia Shuyue understand where the airspeed indicator was, where the altimeter was, and where the heading indicator was. Just these.

Basic data reading has consumed almost all of Xu Cang's energy. Luo Yong actually tried to ask him to teach Xia Shuyue how to approach again, which was simply ridiculous.

If it were so easy to learn, pilots wouldn't be so valuable!

The reason why Xia Shuyue is asked to read the airspeed, altitude and heading data is because even though the horizontal navigation and vertical navigation can guide the aircraft to the runway and can even automatically adjust the speed, the establishment of the landing configuration needs to be done manually.

Yes. Xu Cang can do this by himself.

Although it is invisible, the landing gear handle can be lowered, and there are slots on the flap handle. You can probably tell how many flaps are there by touching it.

Xu Cang needed to confirm the airspeed to establish the landing configuration, and also verify the altitude and heading to verify that the aircraft was indeed flying according to the standard instrument approach procedure.

Suddenly, a strange feeling flashed through Xu Cang's heart. After switching to the frequency of Jianchuan Airport, the plane should be very close to the airport, probably only twenty or thirty nautical miles.

I just talked to the control side. According to the speed of the plane, it should turn to the third right at this time.

According to Xu Cang's memory, the aircraft should have entered the field from the direction of Xishan, and its heading was exactly facing the field. Then, it turned right to join a right three-sided flight about 12 nautical miles away from the field, and flew towards the initial approach of SXS-1Y.

The near anchor point is added to the approach procedure.

It feels like it should be almost right now.

"Shu Yue, where are we flying now?" Xu Cang asked.

Xia Shuyue looked at the navigation page and studied it for a long time, then said with some uncertainty: "It seems to be facing a small green circle."

Xu Cang's heart skipped a beat. That small green circle was the location of Jianchuan Airport, and he punched it in with his own hands. He asked anxiously: "Do planes still follow the red line now?"

The red line is the effective route and approach procedure. As long as the aircraft is still on the red line, it means that there is no problem with the aircraft for the time being.

However, Xia Shuyue said: "Brother, it's gone! It just flew towards the small green circle."

Xu Cang's face changed wildly, and he held the steering wheel tightly with his left hand without saying a word.

Xia Shuyue thought that her voice was too low and Xu Cang's hearing was damaged and did not hear it, so she said loudly: "Brother, you didn't fly along the red line."

"I heard it." Xu Cang took a deep breath, but Xia Shuyue next to her could hear Xu Cang's breath trembling slightly. He patted Xia Shuyue and said: "Hurry up and contact the control and let them locate our location.

"

Xu Cang didn't understand why the plane didn't fly according to horizontal navigation and the program. He only knew that the plane had deviated from the program now, and the subsequent RNP APCH was all empty talk. He didn't even know where the plane was now.

Xu Cang can't expect Xia Shuyue to understand the content on the navigation page.

Although she didn't understand what happened, looking at Xu Cang's solemn expression, Xia Shuyue probably knew that the situation was not good, so she called the control department. However, after calling several times in a row, the other party did not respond.

"Brother, they didn't reply!?" Xia Shuyue became a little nervous.

Xu Cang was also a little panicked at this time. If there was another communication failure, without the help of the ground, they would undoubtedly be worse. Xu Cang stretched out his right hand and fumbled on the communication panel for a while, and switched the transmitter based on his feeling.

For a moment: "You try again."

Xia Shuyue nodded and called several more times, but there was still no response.

Xia Shuyue was really panicked now: "Brother, there is no sound, what should I do?"

At this time, even Xu Cang felt a trace of despair in his heart. Looking back, maybe when he was inputting the CDU just now, because he was worried about temporarily losing his sight, he accelerated the input speed and did not compare the last point of the route with the approach procedure.

The initial approach fix points were connected, resulting in disconnection, and the aircraft deviated from the procedure.

Of course, it is no longer important what the reason is, what is important is what to do now?

Once the plane deviated from the program, Xu Cang didn't even dare to go down, because there was terrain protection when flying according to the program. As long as he followed the program's altitude limit and lowered the altitude one by one, there would be no problem.

But now that he is no longer in the program, Xu Cang doesn’t know what is below. What should he do if he accidentally descends the altitude and crashes into the mountain? If he wants to deviate from the programmed altitude, he needs the permission of the controller, because the controller can see the impact of the terrain. He

I will help the crew evaluate it. However, now I can’t even contact the control department, so I really have no choice.

Let alone flying over the runway, he doesn't even know where he is now!

"Is it really going to be revealed here this time?" This thought appeared uncontrollably in Xu Cang's mind.

Even though she didn't understand the situation at the moment, Xia Shuyue could feel Xu Cang's expression changing, and she couldn't help but ask: "Brother, what should we do?"

Xia Shuyue's voice was getting softer and quieter. Xu Cang knew that his hearing was still declining, and he would soon be unable to hear anything. By then, it would really be a dead end.

It's time to make a decision!

"There is no program, then I will figure out a program!" Xu Cang gritted his teeth. He was carrying too much on his back, and he couldn't just die here!

Relying on the airspeed, altitude and heading that Xia Shuyue can provide and the approach procedure map in his mind, Xu Cang is trying to figure out an approach procedure in the center of this desperate situation!

Well, first he needs to know where he is!

"Keep flying forward!" Xu Cang said coldly.

Xia Shuyue was startled: "Where are you flying to?"

Xu Cang took a deep breath: "On that small circle, let's start from there!"

At this moment, in the control room of the Jianchuan Airport Tower, everyone gathered around the radar screen and watched the signal point of 9811 flying along the SXS-1Y procedure. However, at the turning point on the third right, the aircraft did not turn right and start entering.

Close to the fixing point, but keep flying forward on the heading.

"What's going on? Why didn't the plane fly according to the procedure?" Director Liu was stunned and patted the controller on the shoulder: "The crew just said that it followed the SXS-1Y procedure. Did I hear it correctly?"

"Director, what the crew just said was indeed to approach according to SXS-1Y." The controller confirmed.

"Then why doesn't he transfer?" Director Liu pointed to the controller's microphone: "Call the crew and ask about the situation."

However, before the controller could speak, Xia Shuyue's voice rang out: "Tower, Blue Sky 9811!"
To be continued...