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It's too late, too late!

Previously, Xu Cang used unparalleled mental strength to calculate a downward track, and at the same time he had to share his spirit to complete the aircraft correction operation like walking a tightrope.

Whether it is the decline in mental arithmetics or the unimaginable harsh manipulation according to their wishes, either of them would be enough to defeat the world's top pilot, but Xu Cang alone withstood the pressure from the two mountains.

However, even Xu Cang was under such a heavy burden, it was the end of his strength. Any external interference would have a huge negative impact on Xu Cang, not to mention that the two captains wanted Xu Cang to give up approaching one after another.

In fact, to be honest, we can't blame the two captains. Because not every pilot is a genius who has such insight into everything. In the case of completely invisible, the downward trajectory is entirely based on one person's mental arithmetic.

There is no standard reference and it is also encountered terrain warning.

From a normal person's perspective, he must believe in the onboard terrain warning system.

The onboard terrain on the 747 warns GPWS to determine whether there is any risk of hitting the ground based on the radio altitude and proximity rate. However, this system has an extremely fatal flaw, that is, it cannot be used in extremely steep terrain or smoothly descent terrain.

To judge the risk of the collision.

Therefore, in the later Boeing aircraft, the EGPWS system, which is an enhanced terrain warning, was gradually used. This alarm system does not scan the surrounding terrain, but the terrain data is stored in the aircraft database. The system uses GPS signals as the positioning method.

, and then the obstacles near the aircraft in the database are retrieved according to the location of the aircraft.

Since the radio altimeter is no longer scanned, the omissions of some dangerous terrain scans are naturally eliminated. However, this enhanced terrain warning system based on GPS signals and terrain database also has a very embarrassing problem.

That is when the GPS signal disappears.

Since the enhanced terrain warning system first relies on GPS to locate it, and then retrieve the surrounding terrain data of the corresponding position based on the position coordinates. But what to do if the GPS signal disappears? This enhanced terrain warning system will be incorrect. I don’t know

Which terrain data should be retrieved?

It is precisely because the enhanced terrain warning system cannot figure out where the aircraft is that it starts to randomly retrieve terrain data. If it happens to be adjusted to a mountainous terrain, the enhanced terrain warning system will also determine that the aircraft has encountered a risk of hitting the ground.

, and issue a warning at the same time, which is the so-called fake warning.

Under certain extreme conditions, the plane can suddenly sound a terrain warning when flying safely at a height of 10,000 meters. This is the enhanced terrain warning. Usually this situation is called "Glass Mountain" in the industry.

"It's right.

British Airways 1009 has been flying in volcanic ash for too long, and volcanic ash debris will definitely cause damage to the exposed GPS antenna, so when Xu Cang observed the consultation information about the failure of the left and right GPS in the CDU draft column, he did not feel it.

Accident.

What Xu Cang is more clever than ordinary people is that when others know that a fault occurs, they will only think about how to deal with it. But Xu Cang not only thinks about how to deal with it, but he will also think about what other problems will be extended to this fault in advance.

Come on, when the extension problem arises, it will be calm.

All GPS fails during the approach of the satellite landing system, which means that the satellite signal cannot be obtained, and the entire approach will definitely not be able to continue.

This is not only known to Xu Cang, but also to the responsible captain and the second captain. However, the continued approaching thereafter was the result of Xu Cang's comprehensive various situations.

Since Sukarno Hada Airport began to regret accepting his plane, Xu Cang knew that the person in charge of Sukarno Hada Airport was extremely cautious and would not take responsibility at all.

Now it is not that there is a problem with the ground equipment, but that the GPS antenna of their own aircraft has failed. These two are essentially different.

If there is a problem with the ground equipment, Xu Cang will definitely fly back and pull it back without saying a word. At least in a low-altitude environment, the plane can still live in low-concentration volcanic ash for a period of time. Perhaps during this period, the ground will be

The equipment can be repaired.

However, if the GPS antenna on the plane is broken, it is broken. Given the conditions, it is impossible for someone to climb outside the plane to repair the antenna, which eliminates the possibility of repair.

In other words, the only way of the satellite landing system has been completely blocked.

The blind landing cannot be used, and the satellite landing system cannot be used. Xu Cang could even imagine how Sukarno-Hadda Airport would refuse to let the plane try to land.

So, that is to make a concerted effort!

However, all this was wiped out by a false terrain warning caused by the loss of GPS signal!

"Xu Cang!" The second captain stared at Xu Cang's side face in a daze. The blood that flowed from his nose dripped onto the floor, full of sad and powerlessness.

Xu Cang let out a long sigh, his mouth was filled with the smell of blood like rust, and at this moment, it seemed to stimulate Xu Cang's most primitive survival instinct.

A thin and dense blood appeared in his eyes, which looked extremely hideous and terrifying.

The short mental arithmetic process that was less than a minute just now had consumed almost all his energy. If he flew back, he would definitely not be able to do it again.

This approach is his last chance, the last chance to grasp his own future.

Fate has strangled his throat, but this is definitely not something that can make Xu Cang surrender!

Fall down, drop the plane, and then break your destiny and survive!

At this moment, from the perspective of the captain responsible, after the mental arithmetic process was interrupted, Xu Cang seemed to have lost his soul and was stunned and lost his mind.

Admittedly, they might be really wrong, they are really just false terrain warnings caused by the loss of GPS signals, and maybe they really wiped out their only chance to survive. No matter what, now no matter what.

You can't land on the ground anymore, and force it to land on the ground is asking for death.

At a height of three hundred feet, the captain responsible for holding the driving wheel tightened his left hand. He had reached the limit of intervention: "Xu Cang, leave!"

The big mistake has been made, why are you still obsessed with it? Let’s talk about how to make plans later! If this sound cannot make Xu Cang react, the responsible captain will have to take over the control of the plane by himself. He cannot

Watching the plane crash into the abyss.

But it was this roar that Xu Cang suddenly raised his head, and a dazzling light burst out from his eyes. He saw, saw the road to severance continue again, and saw the last light of dawn before the darkness swallowed everything!

Finally, Xu Cang moved!

Slammed! He added the accelerator! With the roar of three engines, the descent momentum of the plane was quickly stopped.

The captain of the responsible saw that Xu Cang finally added the accelerator and secretly breathed a sigh of relief. Xu Cang finally woke up. However, before the responsible captain had been happy for a moment, the second captain suddenly shouted: "Thrust! Xu Cang, you

No re-flight thrust added!”

With only three engines running, if you want to re-fly the plane, you have to add the throttle to almost the maximum. However, Xu Cang did not do this, just add the throttle to three points of full thrust

The second point is that this is definitely not the thrust that should be obtained when flying again!

The second captain had already had questions when he saw that Xu Cang's thrust was not set enough. Then he looked at Xu Cang's pitching posture setting, and his face immediately changed wildly.

Xu Cang did not take the plane up and lift it up, but simply maintained the aircraft trajectory indicator on the horizon.

"This is not a re-flight, this is a change of leveling!" The second captain was sweating all over his body. He understood Xu Cang's idea. Xu Cang had no idea of ​​getting closer at all, and he had to continue to land!

Since the glide duct of the mental arithmetic was disrupted by external forces, the plane could no longer be maintained on the accurate glide duct, which means that it could not descend without authorization.

Therefore, Xu Cang no longer descended at a height of 300 feet. In order to ensure that there is no terrain threat, Xu Cang will continue to approach at a height of 300 feet.

After understanding this terrible idea that made me feel my mind tremble, the second captain could no longer help: "Xu Cang, do you still want to land? Without any guidance now, you don't even have a DME value, you don't even have it at all.

It may be landed!"

Generally speaking, instrument approach systems are accompanied by DME equipment, DME, namely Distance Measuring Equipment, is a very common ranging device that can provide the distance value between the aircraft and the DME equipment.

The reason why instrument approach systems generally come with DME is that after having a distance display during approach, the pilot can calculate the high distance ratio through the distance to judge whether he or she is higher or lower than the standard glide path, so

Make reasonable corrections.

However, this VOR station on Runway 27 is a simple VOR station and does not come with DME equipment, so it can only provide horizontal guidance without displaying any distance information.

Why did the second captain feel that Xu Cang's idea of ​​continuing to approach is just a mess?

In fact, the location of the VOR station on Runway 27 is quite exquisite, just right at the runway head. If you have a DME display, you can at least judge how far the plane is from the runway head through the DME value.

Now the outside world cannot see it. Without the help of DME, they don’t know when they will fly over the runway! Moreover, this is not considered as the final correction.

Even if Xu Cang can clearly recognize when he will arrive over the runway, what should he do if the subsequent height of 300 feet?

Yes, the VOR station can still provide horizontal guidance. However, its accuracy is far from comparable to the blind landing signal. It is very likely that there is no deviation in the channel on the instrument, but in fact, there is still deviation between the aircraft and the runway midline.

This has nothing to do with the control technology, but the accuracy of the VOR station itself. Why do non-precision approaches such as VOR require more stringent meteorological conditions than precision approaches? It is because the accuracy of non-precision approaches is not high enough, even if it is based on

After guidance on navigation, there was still a large deviation at the moment of visualizing the runway.

If non-precision approaches are like blind landings, they only give the pilot a vertical height correction space of 60 meters, the pilot may not have time to correct it.

It is precisely based on this expected difference in correction difficulty that the minimum drop height of non-precision approach is usually more than twice the height of the precision approach decision. In this way, the pilot can calmly respond to the

The plane made the final correction.

Even if Xu Cang can fly over the runway, how can he go down the last 300 feet? Blindly, all depends on luck?

The captain responsible also reacted at this moment. He grabbed the shaft of the three thrust handles with his right hand, hoping to push the thrust up. However, under Xu Cang's control, the three throttle rods were as unstoppable as rocks.

move.

"I don't need DME, the VOR station itself can provide enough information." Xu Cang said coldly, his words full of unspeakable determination: "Listen to my order, I will take you to live!"

However, the first half of Xu Cang's words fell into the second captain's ears, and a hint of inspiration flashed in his mind. Suddenly, he seemed to understand Xu Cang's thought: "You mean the needle is reversed."

?”

In the control room of the airport tower, controllers are closely monitoring the status of British Airways 1009. Previously, the aircraft has maintained a relatively uniform descent rate.

However, suddenly, the aircraft that had been continuing to decline began to gradually decrease the rate of decline, and all this fell into the eyes of the controller.

"Well, what's going on?" The controller had just had a strange thought, but there was no special reaction. When the aircraft was affected by the airflow on the five sides, it would also fluctuate in the decline rate, but it was usually very

It will return to normal in a short period of time.

However, when the controller was stunned for a moment, he saw that the decline rate of British Airways 1009 was directly reduced to zero.

"Are you going to go back to flight?" This was the controller's first idea. He was even waiting for the crew's report. However, after waiting for two seconds, the controller finally noticed a trace of abnormality and the plane was actually maintained at altitude.
To be continued...