What is the most important thing in today's society?

data!

Especially for certain sensitive objects, their data is even more important.

Why did Xu Xian react so strongly to the terrain data near Longjiang Airport? Because once these terrain data are leaked, Longjiang Airport will be in a position to be targeted by precise attacks at any time.

Longjiang Airport is where the headquarters of the South China Sea Fleet is located. This is a fact that Xu Xian simply cannot accept.

Nowadays, the guidance methods of missiles have shown diversified development, but there is one guidance method, which is terrain matching guidance. The situation is extremely urgent now. The military has no time to process the terrain data, so the uploaded

The information must be military-level accurate. However, the overly accurate terrain data just provides the best and most effective guidance method for terrain matching guidance. If in times of turmoil, the enemy can attack however they want without any deviation?

Xu Xian had not noticed that Zhangzhou Airport and Longjiang Airport were relatively close before. Fortunately, he casually asked the control. The control mentioned that the South China Sea Fleet had called to confirm the situation, indicating that the military was also aware of the existence of uploaded terrain data.

Risky. As the South China Sea Fleet Command, which may be seriously hit, must personally confirm the situation, otherwise they will never leave it to others to judge the safety of the command.

In principle, key sensitive information such as terrain data related to the Fleet Command is not allowed to be transmitted on civilian equipment, not to mention that the manufacturer of this aircraft is not domestic, which undoubtedly increases the risk of leaks.

However, in the end, the military agreed. It does not mean that there is no risk of data leakage, nor does it mean that there is no possibility of the headquarters being attacked, but that the South China Sea Fleet, as a soldier of the people, cannot sit back and watch, even if it has to bear it.

great loss.

Once the data is uploaded, the South China Sea Fleet headquarters will basically be abolished, and the address must be changed. Otherwise, it is unacceptable to always be shrouded in the shadow of precision strikes.

Some people may think that now is a time of peace and the country is strong, so how can anyone dare to challenge the power of heaven? But the ancients said: Soldiers are important matters of the country, the place of life and death, and the way of survival.

The South China Sea Fleet is related to the defense of the entire vast southern sea area, and it should be treated with any degree of caution.

However, along the entire southern coast, there are very few areas with undulating mountains that are suitable for establishing an airport and have good natural deep-water ports nearby.

The South China Sea Fleet Headquarters has not said whether it can find a better location than Longjiang Airport. Even if it finds it, the financial and manpower required to change the address is unimaginable.

But even knowing this, the South China Sea Fleet still agreed to upload the terrain data. This is the spirit and consciousness of the people's army...

However, Xu Xian couldn't accept this!

"Fly blind? How do you want to fly?" The captain frowned and looked at Xu Xian with a determined look: "Xu Xian, sometimes don't show off. I can tell if uploading data will cause any damage to the military.

.But the world is huge and human life is the most important thing. You can’t joke with human life..."

Xu Xian's eyes shuttled back and forth on the wind direction and speed, airspeed indicator, heading and clock. He closed his eyes slightly and couldn't help but recall an image in his mind. It was the short-term terrain display image obtained just by restarting the FMC.

There is a distance circle on the navigation page, and Xu Xian can calculate the relative distance to the aircraft based on the terrain display image memorized in his mind.

"We just looked at the terrain display..." Xu Xian's pupils began to shrink slightly, and his breathing gradually became faster.

"Have you seen the terrain display?" The captain was stunned for a moment, but he quickly realized that Xu Xian was talking about the short-term terrain display image obtained by restarting the FMC just now. He opened his eyes wide and murmured: "There was that

It was just now, is it there now? What’s the point of this?”

The captain didn't understand what was the point of mentioning the terrain display function that had just been briefly restored?

"Yes!" Xu Xian said firmly, "I remember them all!"

"What did you say?" The captain took a breath, but he understood what Xu Xian wanted to do: "You want to use your memory to cross terrain obstacles? Do you know what you are talking about?"

The captain could hardly believe what Xu Xian said. The image displayed on the terrain just lasted only a few seconds. The time was so short that he didn't even look at it carefully before the image disappeared again.

And there is another key point. There are too many mountain obstacles in the area in front of them. If it is in a plain area, there may be only one or two towering peaks, and the image displayed by the terrain is relatively simple. If so, Xu Xian said to remember it

, the captain could still recognize it even if he pinched his nose. However, the terrain in front of them was extremely complex. Even if he was given more than ten minutes, let alone a few seconds, he might not be able to fully remember it.

This kind of thing is not just a matter of saying that it is almost the same. If you remember it slightly wrong, it will lead to the destruction of the machine and the death of everyone.

Xu Xian's eyes began to gather obvious bloodshot eyes, and he slowly turned to the captain: "I know what I'm talking about..."

At this moment, Xu Xian's brain was running rapidly and overloaded. His heart was the powerful source of power, delivering fresh blood to the brain.

"But, even if you remember it, how can you determine the relative position of the plane?" the captain asked eagerly.

"I know the speed, heading, wind direction, wind speed and time. Why can't I determine the aircraft's position?" Xu Xian asked rhetorically.

"What about the drift? The wind direction and speed are not fixed, the heading is not fixed, and the speed is not fixed. The position of the aircraft needs to be constantly updated and calculated. How do you do it? Do you have a flight ruler? Even if you do, you are too late.

calculate!"

Theoretically, with airspeed, heading, wind direction, wind speed and time, it is possible to determine the position of the aircraft, but the amount of calculations involved is extremely terrifying.

If it were in an environment with stable wind, stable airspeed, and stable heading, then perhaps many pilots could still be sure. However, now the outside world is extremely turbulent, the airspeed is unstable, the wind direction and speed are unstable, and the heading is also unstable.

, it is almost impossible just to calculate the deflection angle of the aircraft.

Except when there is a positive headwind or a positive tailwind, as long as there is a crosswind, the aircraft will produce a deflection angle, that is, there is an angle between the heading and the track.

It is obvious that the current environment in which the aircraft is located has crosswinds. The heading displayed on the aircraft is not the direction of the actual flight trajectory of the aircraft. There is a deflection angle between the two.

Generally speaking, to calculate the yaw angle of an aircraft, you need to use a flight ruler, also called a pilot slide rule. Calculating it manually can be quite troublesome.

Moreover, since the wind direction and speed are not fixed now, the deflection angle will keep changing. Even if you have a flight ruler, you may not have time to calculate it, not to mention that Xu Xian does not have a flight ruler yet.

However, the deflection angle is only one aspect. Due to changes in speed, the estimated contact time between the aircraft and the obstacle will also continue to change. Xu Xian needs to determine when to avoid based on the change in speed without any deviation.

In this environment, Xu Xian does have all the data that can determine the position of the aircraft, but each data has huge variables. Too many variables cause the amount of calculations in the entire process to be astronomical, but Xu Xian actually tried to

Calculate it by yourself.

This is just like a worm trying to shake a tree, it is ridiculous and overestimating!

Xu Xian closed his eyes slightly and took a long breath, but his voice was slightly trembling. He paused and did not continue talking to the captain. Instead, he raised his eyelids and whispered to Meng Zili: "

Inform the control and ask them to tell Guangdong Airlines not to retrieve terrain data."

"Captain Xu, do you really want to fly by yourself? How about we apply for fighter piloting? This is not far from our airport, and it will be very quick to get here." Meng Zili advised. To be honest, he was also worried about what Xu Xian was about to do.

Worrying and incredible. Being able to figure out the evasive path just by mental arithmetic is simply something that only gods can accomplish.

"The low-speed performance of fighter jets is not as good as ours. The aircraft body is small and its ability to resist turbulence is average. Wouldn't it be more dangerous for them to pilot between valleys?" Xu Xian said.

It's not like he hasn't thought about letting fighter jets come over to pilot the aircraft. After all, many fighter jets are now equipped with terrain avoidance radars. As long as the terrain is not too complicated, it should be possible to pilot the passenger plane through the valley.

But now the wind is too turbulent, and the fighter body is already relatively small. The same turbulence is nothing to a huge civil aviation aircraft, but it may be more difficult for a fighter jet to operate. Moreover, since it has to pilot, the fighter jet must

It is also flying at low speed. The low-speed performance of fighter jets is inherently worse than its high-speed performance. Doesn't this make it even more dangerous?

If fighter jets are really allowed to come over to lead the way, it is really possible that the fighter jets will get into trouble first...

"But Captain Xu..." Meng Zili wanted to say something more, but Xu Xian stopped him: "Execute the order!"

Meng Zili's body trembled, he took a deep look at Xu Xian, and finally said seriously: "Yes!"

Xu Xian slowly grasped the steering wheel with his right hand, and the terrain display image in his mind gradually became clearer. Slowly, Xu Xian even began to hear his own heartbeat, like the beating drum, responding to the surging power.

At this moment...the world seemed to be quiet...as if it was waiting for Xu Xian's performance.

...

"What did you say? I don't want the terrain data? Why not?" Listening to Meng Zili's words, the supervisor on duty couldn't hide the disbelief on his face: "If you don't want the terrain data, how can you fly?"

Meng Zili looked at Xu Xian in front of him and said softly: "Captain Xu is here to fly..."

"Team Xu? Xu Xian! What nonsense? How can he fly? How can he fly without terrain data? How can he avoid obstacles and fly?" The supervisor on duty almost roared at Meng Zili and yelled: "What on earth are you doing? Terrain data can be used, why not use it?"

?”

The roar of the supervisor on duty echoed through the loudspeaker in the small cockpit. Xu Xian, who was calculating rapidly in his mind, was disturbed and his body trembled slightly. Meng Zili keenly noticed Xu Xian's change. He gritted his teeth and directly

The VHF speakers were turned off so that Xu Xian no longer had any external interference.

Even though the captain on the left was anxious, he didn't dare to disturb Xu Xian anymore because the matter was over, because the next second, the plane might hit a certain mountain...

The supervisor on duty yelled a lot of words into the microphone, but there was no response from the other end of the radio. The supervisor on duty was so angry that he slammed the microphone on the table.

"It's crazy, it's all crazy!" the supervisor on duty scolded: "As long as that guy Xu Xian is around, there will be nothing that is not crazy."

Next to him, the assistant asked softly: "Director, what about the terrain data?"

The director on duty felt his temples tingling. After thinking for a moment, he said bitterly: "Notify the military and say that the retrieval of terrain data will be suspended..."

"If the military asks the reason..."

The supervisor on duty glared: "Tell the truth, I don't care, they can go crazy on their own!"

...

The Lotto Transportation Control Center has just received news from the Huacheng Control Office that some terrain data packets will be transmitted and then uploaded to the flight 5641.

Since receiving this news, the security manager has been watching all the time, looking forward to the arrival of the terrain data package. But after waiting for a while, there was no sign at all.

Nowadays, airplanes are single-engine, but in a typhoon, this is a life-and-death moment where seconds are at stake. Why is the efficiency of Huacheng control so slow?

The Huacheng control room did not say that the terrain data packets were sent from the military, which led the Lotto Transportation Control Center to think that Huacheng control had terrain data! Although they could not figure out why the control room had the terrain data.

Terrain data...

When the safety manager, who was almost losing his patience, couldn't bear it anymore, he was going to ask someone to contact the Huacheng Control Office. At this moment, a staff member came over to report: "Brother Wang, there is news from the Huacheng Control Office.

The data will not be transmitted for the time being."

"It won't be transmitted? Why won't it be transmitted? How can the crew fly?" The safety manager was confused, and he changed his mind as soon as he said it.

When he contacted the Huacheng control office just now, he already knew the status of flight 5641. Without terrain data, how could the crew fly?

The security manager waved to the staff: "Hurry up and ask Huacheng what's going on."
To be continued...