Return to 2000: Captain of the Great Powers

Chapter 121 God!Protect me again! (Please subscribe!)

In the Jianchuan control room, Di Qingquan suddenly turned his head and looked at Luo Yong: "There is no circling approach procedure at Yulong Airport, right?"

Although Di Qingquan is the chief engineer of the General Administration, it is impossible for him to know the situation of all the airports in the country, not to mention that the southwest area has relatively little jurisdiction, so he knows even less about the situation.

However, there are very few domestic airports that implement visual circling approaches.To be reasonable, Di Qingquan could even recite the list of all these airports. No matter how he recalled, it seemed that Yulong Airport was not included.

Circling approach, that is, visual circling approach, also known as reverse approach, that is, intercepting the localizer from the runway opposite the landing runway, and then maintaining a continuous visual view of the runway at a specific height within the airport safety zone, according to regulations procedure, bypassing the entire airport and turning the landing direction to the intended runway.

Of course, different directions on the same runway are the most common form of visual circle approach.In some special procedures, approach and landing offsets can be completed on different runways that present an angle, that is, on one runway, align with the localizer without pressing the APP, and then turn to another completely different runway to land .This kind of situation basically occurs in airports where the two runways are at an angle rather than parallel, but such airports are relatively rare.

Due to the existence of the circling approach protection zone, within a certain range, the clearance conditions around the airport must be sufficient to complete the visual flight.The scope of the hovering protection zone is not the same in the standards of FAA and ICAO.In China, the ICAO standard is adopted, and because during the hovering period, the aircraft does not establish a landing configuration, but flies with flaps five, and the speed can be controlled at 180 knots.At this speed, the radius of the circling area from the circling approach protection zone to the runway threshold should be 4.2 nautical miles.

It is particularly worth noting that the radius protection zone of the circled area centered on the runway threshold is not only centered on the landing runway threshold, but simultaneously draws a radius of 4.2 nautical miles centered on the landing runway and the initial aligned runway threshold circle.All the airspace within the circle, including the overlapping part, is the circle protection area during the visual phase of this approach.

No matter what the reason is, as long as the aircraft leaves the circling protection zone, it will be regarded as an approach failure.Because the visual circling approach usually cuts to the fifth side and lands in one go after the three-side rotation, which extremely tests the pilot's visual judgment ability.Because basically when cutting into the final, the aircraft is already very close to the runway, and there is not enough straight-line distance for roll and pitch correction.As long as the pilot didn't control the bank, didn't turn right on the final, or there was a problem with the control of the descent rate, and there was a problem with the altitude when cutting into the final, then it was almost time to go around.

At the same time, the go-around method of the circling approach is also extremely complicated.Once a go-around, the go-around should not follow the direction of the landing runway, but should turn back to the direction of the go-around of the runway that was originally aligned, and go-around according to the go-around procedure of that runway.

However, there is a lot of knowledge about how to turn to the go-around procedure of the runway that is initially aligned, especially in the visual circle approach of the angled runway.

The procedure is complicated, and the control difficulty is extremely high, so in the flight of visual circling, various problems often occur, and there are even a few times where there are almost flight accidents.

All domestic unsafe flight incidents must be summarized to the General Administration, and the Department of Aviation Safety and the Flight Standards Department are basically responsible for review.The aviation safety department is the director Li Lin, and the flight standard department is almost in charge of Di Qingquan's review of unsafe flight incidents.Therefore, he deeply understands that the method of visual circling approach itself has risks, so the domestic bureau is very cautious when approving and implementing relevant procedures.

Airports that can implement visual circling approaches usually require good clearance conditions, at least within a radius of [-] kilometers. However, according to Di Qingquan, the clearance of Yulong Airport does not seem to meet the requirements.

Sure enough, Luo Yong nodded after thinking for a while: "I also remember that Yulong Airport does not have a visual circling approach. No, in the province, except for Jianchuan Airport, which can conduct visual circling, all other civil airports should not have visual circling. The approach procedure is right. What exactly is Xu Cang going to do?"

Mo Shangyun's face is also very ugly. He has been flying in Southwest China for nearly 30 years, not to mention civilian airports, when he was serving in the Air Force, he even flew all over military airports.

Luo Yong still said it too conservatively, not all civilian airports except Jianchuan Airport, but all military airports also did not have visual circling approach.The entire province is full of high mountains and ravines, and the only large plain is for the provincial capital Jianchuan. Therefore, Jianchuan Airport has good enough clearance conditions to implement visual circling. The rest of the province’s airports are surrounded by mountains. How can there be such a good Clearance environment?
"Xu Cang, what on earth are you thinking?" Mo Shangyun roared in his heart, since he placed his hope in a program that didn't exist at all.

Director Liu did know that Jianchuan Airport has a visual circle approach procedure, but since the procedure was released, Jianchuan Airport has never implemented it, which is written in the Jianchuan Control Instructions.Except for emergencies, the visual circle approach procedure is not used in principle. It can be seen that the control party is well aware of the risks inherent in the visual circle approach procedure.

"What should we do now?" To be honest, Director Liu never expected the situation to develop to this point.However, Xu Cang was alone on the plane now, and it was useless for them to shout here, everything was in accordance with Xu Cang's last wish.

However, now he is even doubting whether Xu Cang can still think normally, otherwise why would he invent a program that was created out of nothing?Could it be that Xu Cang has already lost his consciousness in the harsh environment where the windshield is broken?

In fact, this is not impossible.At high altitudes, the oxygen content is already low. Under the blowing of strong air currents, due to the reduction of air pressure, it is even more difficult for people to breathe.Under such circumstances, Xu Cang may really lose his normal thinking ability.

If that's the case, that's really the worst possible outcome.

Di Qingquan's face became more and more gloomy, his mind was constantly running, and finally he said in a deep voice: "Let the search and rescue team send a helicopter to Yulong Airport!"

Director Liu was stunned: "You know that the search and rescue team only has two helicopters, right? Although the earthquake damage in Yulong city is not too big, the pressure on the search and rescue team with only two helicopters is still very high. one."

"Xu Cang can't have anything to do!" Di Qingquan lowered his head: "No matter what, Xu Cang's safety is the priority, he deserves this kind of treatment. Is it convenient for you to contact the fire department? Then I will do it myself."

The Provincial Search and Rescue Team is composed of the Provincial Fire Brigade, the Provincial Earthquake Search and Rescue Center and the Emergency General Hospital.However, there are only two helicopters in the air force for front-line search and rescue.For this southwestern province, the two helicopters are really stretched, but there is nothing they can do.

Director Liu frowned: "Forget it, you better keep quiet, I know them better, and I'll tell them."

Di Qingquan breathed a sigh of relief. Now there was only the noise of wind and rain in the speaker, and there was no movement of Xu Cang at all. I don't know what state Xu Cang is in at this time?
At this moment, Xu Cang only felt like he was in an ice cellar.The altitude of the plane has dropped to about 100 meters. Although it is not as deadly as [-] feet at this altitude, it is still raining outside, and the strong wind brings the rainwater in, which wets Xu Cang's whole body almost instantly. .

According to the report from Yulong Airport just now, the landing of hail has been visually observed on the field.This also shows that the group of thunderstorm clouds on the five sides is filled with a large number of supercooled raindrops.

So-called supercooled water is water that is below freezing but remains liquid.Because it is too pure and lacks the condensation nuclei needed for condensation, it remains liquid below the freezing point.

However, as soon as this supercooled raindrop touched Xu Cang's clothes, it condensed into ice slag at a speed almost visible to the naked eye.However, in just half a minute, Xu Cang's clothes, arms, and even eyelashes were covered with ice particles.

Xu Cang exhaled lightly, he knew that he had to land as soon as possible, otherwise, just losing his temperature would kill him.

In fact, there is no need for severe hypothermia. Just under moderate hypothermia, his muscles will twitch uncontrollably, his thinking ability will be lost, and his coordination will almost disappear.Under such circumstances, no one can continue to control the plane normally, and all that awaits him is death.

In the ears, amidst the chaotic wind and rain, the warning sound of the cabin altitude being too high could be vaguely heard.It all happened so quickly that the moment the windshield broke, it took a while for the cabin to rise above [-] feet.

He opened and closed his right hand slightly, and found that he was not completely frozen and could still move.Xu Cang lowered his head to avoid the direct impact of wind and rain.He didn't pull up the plane immediately, but directly changed his left hand holding the throttle stick to the steering wheel to control the plane to maintain level flight, and at the same time freed up his right hand, put it down and kept groping above the storage box on the right.

The wind was strong and the rain was heavy. Even if Xu Cang lowered his head, it was still difficult for him to open his eyes, and he could only rely on the sense of touch.However, his right hand was so cold that he was about to lose consciousness, and in a hurry, he couldn't touch the oxygen mask at all.

"Hurry up, hurry up!" Xu Cang kept roaring in his heart. Although the altitude of the plane is not particularly high now, under the impact of the strong airflow, it is difficult for him to breathe normally. Without an oxygen mask, he will soon lose Lost consciousness at low temperature.

Suddenly, the right hand that could hardly feel the subtleties suddenly touched a protrusion.In fact, Xu Cang didn't know if it was an oxygen mask, but he couldn't care less.Pinch the protrusion directly, and then pull it up fiercely.If this pulling did not pull the thing up, then Xu Cang could almost pronounce a death sentence.

However, perhaps because of God's favor, Xu Cang did not miss the last chance.Under his force, the entire oxygen mask was pulled out directly.

The oxygen mask equipped in this 737 is not a face-covering type, but only covers the mouth and nose.

The moment he saw the oxygen mask, Xu Cang cursed inexplicably, how good it would be if it was a face-covering oxygen mask, it could help him to block the incoming rainwater and airflow to a certain extent.

However, Xu Cang didn't care about these things at this time.With the oxygen masks pulled off, the cockpit's oxygen system kicked in.Xu Cang kept the kneading thing, so that oxygen can be filled in the root canal that the mask is used to fix.Only when the root canal is propped open with gas can he put on the oxygen mask more conveniently, otherwise, the difficulty of wearing it will increase exponentially.

Because the right hand has begun to be less able to control.Xu Cang gritted his teeth, switched his left hand to the grip of his right hand, and then made a circle back to balance.

Such a weird grip is not what Xu Cang wanted, but the electric trim switch is in the grip of the right hand, which is usually controlled with the thumb of the right hand. If it is controlled with the left hand, an awkward grasping posture must be performed.

He now has no time to input a proper pitch trim to maintain a perfect state without human control.Therefore, Xu Cang just adjusted the stabilizer trim very casually, as long as the plane does not fall down.

After finishing the trim, the plane just went up and down slightly, and then began to bow its head.This means that the pitch trim input by Xu Cang is not enough.

However, Xu Cang didn't plan to take care of it.Just when the plane lifted its head up briefly, Xu Cang's left hand was released for a moment, and when there was almost no time left, he grabbed the inflated root canal at the back of his head with his free hand, then pulled it down hard, and then adjusted it with his right hand, Finally release the right hand, the system stops air supply.Under the action of the elastic force, the root canal of the oxygen mask tightened instantly, firmly fixing the mask on Xu Cang's mouth and nose.

hiss!
The cold oxygen flows through Xu Cang's mouth and nose like a stream, refreshing, as if at this moment, Xu Cang is alive again.

However, at this moment, the plane began to turn into a descent.Xu Cang grabbed the throttle lever again with his left hand, and the steering wheel with his right hand. He applied the throttle with his right hand, and the plane turned from a slow descent to a climb.

If he wants to make an initial approach from runway 03, he must first turn around and return to Cangkou, and join the approach procedure of 03 from Cangkou.Compared with runway 21, which has an extremely complex airspace, the airspace of runway 03 is relatively simple, but it can descend completely according to the approach procedure, even without the controller's command, Xu Cang can fly down according to the procedure by himself!

However, flying back to Cangkou does not immediately fly back.Turning immediately below the program limit altitude will only immediately hit the valley walls on both sides, so he needs to go up to a safe altitude of 700 meters before starting to turn around.

After adding the thrust to the climbing thrust, Xu Cang let go of the thrust handle with his left hand, and groped for the first VHF1 on the upper left corner of the center console.

When he came over, he adjusted the backup frequency to the tower frequency of Yulong Airport.By feeling, Xu Cang groped for the frequency switching button, and switched the radio frequency from Jianchuan Tower to Yulong Airport Tower frequency.

With his head down, Xu Cang shouted with almost all his strength: "Lantian 9200, is the ILS signal available for runway 03 now?"

At this time, on the control tower of Yulong Airport, since it had started to rain and hail outside, the three of Lu Jinghua went to the control room of the tower, and were debating whether to evacuate with the airport personnel.

However, they had previously received word that another plane would come and try to land.Therefore, after the tower controller had the idea of ​​evacuating early, it was Lu Jinghua who spent a lot of effort to temporarily stabilize the tower controller and let him wait a little longer.

People are on the tower, climbing high and looking into the distance, the clouds on the five sides like pillars piercing the sky are really unimaginably oppressive.

It's too close, it's really too close, even with the naked eye, Lu Jinghua can tell how close the cloud is to this field.Then I looked at the windbags on the side of the runway. One was blown parallel to the ground, and the other was missing with the pole attached.

The controller of the Yulong tower was full of anxiety. Looking at the thunderstorm cloud that was getting closer, he couldn't help complaining: "In this kind of weather, the airport has been closed long ago. What's the matter?"

Lu Jinghua was also extremely anxious at this time, constantly searching the sky for traces of the plane, he pointed to the radio communication equipment: "Is this thing okay?"

"Oh, it can be used, it can be used." The controller also followed Lu Jinghua to scan the sky, but the sky is so dark that no plane can be seen: "I said that the people in your company are crazy. It can fall, and there is no navigation on runway 21! If there is a flight accident, you will drag us into the water."

However, Lu Jinghua didn't want to talk about anything with the controller at all, he scratched his head and scratched his head in agitation.According to the time, the plane should be about to enter the airspace of the airport. No matter how late the handover was, it was time to switch to the frequency of the Yulong tower at this time. Why was there still no movement at all?

In addition, due to the damage to the communication base station due to the earthquake, Yulong Airport was originally located in a remote place, and the contact with Jianchuan was intermittent, and it was not convenient to obtain information about Lantian 9200 from Jianchuan.

If it was confirmed that Lantian 9200 had given up the approach, he would have evacuated with the airport personnel long ago.But if Blue Sky 9200 is still trying to approach in the sky, and all the people at the airport withdraw, the crew of Blue Sky 9200 will become lonely.

All of a sudden, Lu Jinghua was in a difficult situation.When he had no place to vent his anger, Lu Jinghua cursed inexplicably: "Your airport doesn't have the money to install air traffic control radar, you can install an ADS-B."

The controller was already annoying. Hearing Lu Jinghua's complaint, he immediately scolded: "Now the Capital Airport doesn't even have ADS-B installed. You fucking asked us to install it at the airport. What are you kidding?"

ADS-B, Automatic Dependent Surveillance-Broadcast System, is a device that can reflect the four-dimensional information of aircraft to controllers in real time.Although it cannot completely replace the air traffic control radar in terms of regulations, it can give the controller great control over the aircraft.Moreover, the equipment cost and maintenance cost of the ADS-B system are much lower than those of air traffic control radar, making it a highly cost-effective auxiliary control device.

However, Yulong Airport has ADS-B equipment. Once the Lantian 9200 enters the detection range, the real-time status of the aircraft can be seen on the control tower just like the radar of a large airport.

Lu Jinghua was so anxious that he scratched his head in embarrassment. He was about to apologize, but suddenly there was a loud noise in the communication speaker, followed by a vague voice: "Blue sky 9200, now 03 Is the ILS signal available for runway No. [-]?"

At first, Lu Jinghua and the controller didn't react yet.During thunderstorms like this, radios are often affected, causing unprovoked background noise similar to galvanic noise.

However, Wang Xuan, who had been silent all this time, heard Xu Cang's voice, and his expression changed drastically: "Stop talking, someone is calling!"

"What?" The controller was stunned: "Someone called just now, not background noise, shit!"

He quickly picked up the microphone: "Jade Dragon Tower, who was calling just now?"

Amidst the continuous noise, an intermittent voice sounded again: "Yulong Tower, is the ILS signal for runway 03 available!?"

"Xu Cang!" Now Lu Jinghua recognized Xu Cang's voice, even though the voice was very unclear.However, Lu Jinghua soon realized something was wrong. Shouldn't he land on runway 21? How could he land on runway 03?

"Did I hear you right?" Lu Jinghua pointed to the loudspeaker: "He's talking about number 03, isn't it number 21?"

To be honest, the tower controller was a little confused about the situation.The planes that came here before all tried to land on the 21st. Isn't this already a consensus?

"Blue sky 9200!" The tower controller shouted loudly: "You should use runway 21, and runway 03 cannot be stopped after landing!"

However, Xu Cang's weaker and weaker voice answered him: "Lantian 9200 is now located in the section from Cangkou to the starting turning point, ascending at an altitude of 400 meters, rising to a safe altitude of 700 meters and turning back to Cangkou Taiwan, join the approach procedure of runway 03, and circle the runway 21 to land!"

At the end, Xu Cang's voice was already faintly visible, almost drowned in the noise.

However, the shock that this passage gave Lu Jinghua was soul-stirring. He said to himself in a daze: "Circling approach, he will circle from No. 03 to No. 21 to land, so he needs the ILS signal navigation of No. 03 runway! No. , No, but Yulong Airport clearly does not have a circling approach procedure!"

Beside Lu Jinghua, Wang Xuan's face completely darkened: "He is crazy!"

The tower controller inserted his hand into his hair, and for a moment, he also became confused: "I also remember that there is no circling approach procedure, what does he mean?"

Immediately, the tower controller held the microphone and yelled: "Lantian 9200, there is no visual circling procedure in this field, there is no visual circling procedure in this field, there is no visual circling procedure in this field!"

He kept repeating, almost shouting out his throat.However, the only response to him was meaningless murmurs.The tower controller looked pale: "It's over!"

However, Lu Jinghua was talking to himself: "He said he was between Cangkoutai and the starting turning point, so that should be that direction!"

After speaking, Lu Jinghua turned directly to the direction of the five sides to the north, touched the telescope on the table with his hand, and searched the sky there.

As long as the plane can reach a safe altitude of 700 meters, it means that it has left the river valley and can be observed visually.

"Xu Cang, Xu Cang, Xu Cang! What on earth are you going to do!" Lu Jinghua kept mumbling, he didn't believe Xu Cang was crazy, but Yulong Airport obviously didn't make a visual circle approach, what was he thinking? ?
Just when Lu Jinghua was in a state of turmoil, between the gaps in the peaks, Lu Jinghua suddenly found such a small black spot, it was Blue Sky 9200!

"Here we come!" Lu Jinghua was so excited that he almost cried out.

Guided by Lu Jinghua's voice, Wang Xuan and the tower controller followed Lu Jinghua's gaze and looked over.Fortunately, there is no obvious visual obstruction in this field area, and they can vaguely see a black dot walking between the peaks with the naked eye.

"There is really a plane!" The tower controller was stunned: "No! He can't climb out!"

Almost at the moment when the voice of the tower controller fell, the black dot that had just appeared disappeared from the field of vision again.It was not blocked by the mountain peak, but rushed into the thunderstorm cloud cluster like a giant beast like a moth to a flame.

Lu Jinghua tilted his body, his hands softened, the telescope fell down, and the lens shattered with a crisp sound.

In the cockpit, Xu Cang kept trying to call the Yulong tower, wondering if the ILS signal for runway 03 was available normally.Since only runway 21 was considered before, and no availability of runway 03 was considered at all, there is really no relevant information about runway 03.When it was really necessary to use the ILS guidance on runway 03, it became embarrassing instead.

Since the visual circle approach needs to abide by the strict protection area restrictions, each flight segment must be strictly calculated, including deviation corrections for wind direction, wind speed and flight altitude.Once there is a problem with one of the links, the plane will easily leave the protection zone. As long as it leaves the protection zone, the plane will immediately face the risk of hitting the mountain.

As the starting point of all procedures, the altitude of 03 feet above the ground on the localizer of runway 03 is the starting point, and this point must never be wrong.Once this point is wrong, everything will be wrong later, and it cannot be corrected, so the blind landing signal of No. [-] must be available, otherwise everything will be over.

However, Xu Cang did not answer the two calls to Yulong Tower, so that in the end, Xu Cang could only use a method similar to blind transmission in the frequency to inform the tower of his intentions: "Lantian 9200 is now located in Cangkou to the beginning At the turning point, ascend at an altitude of 400 meters, rise to a safe altitude of 700 meters and turn back to Cangkou Terrace, join the approach procedure of runway 03, and hover over runway 21 to land!"

He no longer cared whether the tower had received it, whether the ILS navigation on runway 03 was available, anyway, let’s fly there first.

After the broadcast, Xu Cang's whole body began to twitch involuntarily, which he couldn't control.It was clear that he had reached mild hypothermia, and his core temperature was beginning to drop.

"Wait a little longer, hold on a little longer!" Xu Cang's heart was beating non-stop, thinking about the blood being pumped from his limbs to maintain his body temperature as much as possible.

But he has really reached the limit, and he is about to complete a shocking move within this limit.

However, suddenly, Xu Cang seemed to have a feeling.He raised his head violently against the wind and rain, and in his eyes that could barely open a slit, the altimeter on the PFD that was already covered with rain did not move!
"The altitude hasn't risen?" Xu Cang's breathing stopped at this moment, and he took the stick again, and the throttle was almost at the maximum, but the altitude was only rising at an extremely slow speed.

"No, no, no!" Xu Cang's mind went blank, and he suddenly thought that the thunderstorm cloud was an incredibly strong convection system in the development stage, and the air flow inside it was constantly developing upwards, which caused the surrounding area to There will be a huge downdraft.

The thunderclouds ahead were so intense that the surrounding downdraft overwhelmed the almost full-thrust plane, unable to lift its head.

"A rise rate of two hundred!?"

That's right, Xu Cang clearly saw that the lift meter only had an ascent rate of 200 feet per minute.However, at this moment the plane was rushing towards the thunderstorm cloud at a speed of more than [-] knots.

"I can't climb out!" At this moment, Xu Cang looked at the still towering rock walls on both sides, he couldn't turn at all, but the almost negligible rate of ascent under the action of the downdraft couldn't take him out of the valley at all !
The thunderstorm cloud cluster that had almost occupied all of Xu Cang's field of vision was as if Mount Tai was pressing down on him, and Xu Cang was about to suffocate, and the flowing lightning that exploded within it made Xu Cang fall into despair and couldn't extricate himself.

He couldn't fly, other than hitting the mountain, he had no choice but to keep going!
I don't know why, at this moment, many images flashed through Xu Cang's mind, and then at a certain moment, everything stopped.Approaching the clouds, the rain poured into the cockpit as if piercing the sky.

Xu Cang's whole body was trembling, and suddenly, an electric arc cut open the sky, reflecting Xu Cang's pale, dead face.His right hand gripped the steering wheel tighter than ever.

Her lips squirmed slightly, and there was a very slight sigh amidst the explosive thunder: "God, protect me once more!"

(End of this chapter)