The second test flight area is about 60 kilometers away from the Chengloma Airport in a straight line, which belongs to the suburban rural area, with plains and farmland at the bottom, avoiding the civil aviation routes, and the clear space conditions are relatively good.

In the case of a large maneuver range, a test flight will be arranged in this airspace. To run at maximum speed, it is obviously necessary to have a considerable airspace range, and two or three hundred kilometers is obviously enough.

After Li Zhan took off, he quickly climbed to an altitude of 8,000 meters, and after checking the status of the aircraft, he asked the tower: "Tower, Dong Yu requests to enter the maximum airspeed test flight, over." ”

"Cave, you can start." Chen Ming gave the order.

The altitude of 8,000 meters is safe, the civil aviation routes in this area are all below 6,000 meters, the transit routes are more than 8,000 meters, and there is an altitude difference of at least 300 meters, so Li Zhan opened the accelerator with confidence.

Li Zhan turned on the afterburner and began to run wildly, and under the surging power, the plane gave the pilot a strong sense of pushing back, which was stronger than the feeling of pushing back during takeoff. The two spouts were wide open and spewed out a pale blue tail flame, which could be faintly visible to the naked eye in the bright environment above the clouds.

The acceleration ability, which is better than any previous fighter, makes Li Zhan's blood rush. No man can resist the thrill of speed, no matter what he does. In the world, there is no merit and everything is broken, only fast is not broken. The Rafale fighter with the best acceleration performance that Li Zhan has ever piloted is the Rafale fighter, but compared with the Black Ribbon, if the Rafale fighter is a small batch of family cars that rely on turbocharging to improve the acceleration performance, then the Black Ribbon is a large sedan in a suit that purely relies on large displacement to improve the acceleration performance.

Li Zhan watched as the airspeed number continued to rise, and he actually broke through the sound barrier within seconds! The sudden sonic boom in the sky shook everyone within a certain radius of the ground, and then a rumbling sound much louder than the rolling thunder thundered from the sky to the ground, and the sound could be clearly heard moving westward.

"Breaking the sound barrier so quickly." Chen Ming subconsciously looked at the chronograph and was slightly surprised.

He became more and more convinced that the limits of fighter performance were related to the pilot.

For the same plane, if the maximum airspeed is 2,000 kilometers per hour, Li Zhan may be able to fly to the limit of 2,500 kilometers per hour, but he can't do it to himself. The technical parameters on the instruction manual are the envelope that the test pilot flew out, and not the limits of the aircraft itself.

This shows that a test pilot like Li Zhan is rare - he can fly a wider range of flight envelopes, which is of great practical significance.

Li Zhan maintained the heading altitude, clenched the control stick, and paid attention to the various systems of the aircraft, focusing on engine speed and airspeed.

It's 2,000 kilometers per hour, and if the altitude is less than 1,000 meters, then in the eyes of the ground personnel, the No. 01 black ribbon is a "whoosh" and an afterimage past, and it is not clear what it is flashing by.

The No. 01 black ribbon did not disappoint Li Zhan, all systems were normal, the fuselage was very stable, and the flight attitude was very stable. The obvious difference is that the wind noise is much smaller than that of other aircraft, indicating that the aerodynamic layout is excellent.

At supersonic speed, the sound of the engine can no longer be heard, and only a slight vibration caused by the engine can be vaguely felt. Fourth-generation aircraft have also done a very good job in this regard, without the phenomenon of other aircraft trembling all over.

The airspeed reached 2,300 kilometers per hour, and everything was still normal for the aircraft. This shows that the fourth-generation aircraft can carry out normal operations at such a top speed, of course, it cannot do a big maneuver, otherwise no matter how strong the aircraft is, it will disintegrate in the air - such a fast speed is a large overload of many Gs.

Then the acceleration rate decreased significantly, and the increase in airspeed slowed down a lot, but the No. 01 black ribbon was still stubbornly arching forward, like a bullfight that refused to admit defeat, attacking the opponent again and again.

"Cave! It's two thousand six, is the plane in normal condition? Chen Ming's voice trembled, and Li Zhan broke through the limit again, flying out of a new height of extreme speed.

Li Zhan quickly glanced at it and said, "All systems are ...... normally."

Before the words fell, the speed of the left hair suddenly fell rapidly.

Li Zhan quickly made a judgment and immediately reported: "The left hair is stopped, the tower, the left engine is stopped, I'm going to slow down, over!" ”

"Emergency, return immediately!" Chen Ming's heart tightened, and he immediately gave an order.

Strangely, he gave it away in his heart, as if another shoe had finally landed.

Bao Guanhua also subconsciously stood up and looked west, although he couldn't see anything. Only then did he remember that there was a monitoring screen on the tower, and he hurriedly looked over, and the airspeed of the No. 01 black ribbon fell to 2,000 kilometers per hour in a very short period of time.

It's still fast.

Without waiting for him to remind, Chen Ming also noticed this problem, and hurriedly gave Li Zhan an order, "Dongyu, slow down quickly, turn around and return immediately!" ”

"Disposing of...... The throttle stick is not very obedient...... Oh, and the powertrain failure light is on...... Uh, left-hand automatic...... The tower and throttle lever completely failed, and the power system was running at full power. It took Li Zhan more than ten seconds to finish the report, all because these problems appeared one after another in the report, as if all the friends of the previous No. 01 Black Ribbon were to deceive him to the sky, and then give him a ruthless blow.

The tower is going to blow up, this is a bunch of failures!

So far, there has not been a single flight with so many failures, and every one of them is fatal. The throttle stick is out of order, the power system is out of order, which means that the steering system is likely to be out of order as well.

Any one of them will cause a major flight accident that destroys the plane and kills people.

Li Zhan was very calm, he said, "Tower, help me clear the airspace in front of me, I need time to deal with it, over!" ”

"The tower understands! You can skydive depending on the situation! Chen Ming said quickly.

Bao Guanhua had already picked up the phone and reported it to the Air Force Regional Control Center. The Air Force Regional Control Center has long been prepared, and ensuring the test flight of the fourth-generation aircraft is the most important task, and they have a number of plans. After receiving the report from the manufacturer's tower, they quickly ordered all civil aviation flights to bypass the designated airspace, and the planned detour was already in the designated airspace for emergency avoidance.

The civil aviation district management suddenly became busy and completed the task of the air force regional control center in a very short time.

The second test flight airspace continues to the west is the Chongzhou area, and then west is the Qinghai-Tibet Plateau, where there is a civil aviation route into Tibet, and all flights in and out of Tibet are taken by this line, so it is quite busy. The most important thing is that the altitude of 8,000 meters coincides with the cruising altitude of the route, and the hidden danger is very large.

Of course, Li Zhan can climb or lower in height, after all, the joystick is not out of order. The problem is that until the cause is found, his best option is to let the plane fly forward in its current attitude.

Li Zhan tried many methods, but still could not solve the problem of power system failure. Randomly, he started with the throttle stick again, and the result was the same. He has encountered so many dangerous situations, engine failure, bird collision, lightning strike, cockpit canopy flying off, landing gear jamming, and even the control lever has been specially broken, but he has never encountered a throttle lever failure.

"It's really frustrating."

Li Zhan smiled bitterly and said, "I haven't encountered any danger, and I really haven't encountered anything like this." ”

Chen Ming was crazy, "Dong Yu, what do you think, is there a way?" ”

"There's a way." Li Zhan said.

The tower jumped for a moment, and Chen Ming hurriedly asked, "What way?" Hurry up! ”

"When the fuel runs out, there is a high probability that it will be successful." Li Zhan said as a matter of course.

What kind of solution is this!

Everyone was immediately disappointed, the fuel consumption is difficult to calculate accurately, the gliding flight ability of the fourth-generation aircraft is very limited, and the most important thing is that it must be stuck at the moment when the fuel is exhausted, the aircraft is just at a certain point in the landing route, early or late.

It's simply impossible to finish.

You know, as long as there is fuel left, the engine will run at full power, and no matter how it is done, it will be a level flight approach in the end, and the current situation of the aircraft is bound to be supersonic speed.

Landing at supersonic airspeed?

What an international joke are you making!

Chen Ming cried and said with a smile, "Dong Mi, now is not the time to joke, the technicians are urgently analyzing the cause of the failure, you have to control the plane!" ”

"Understood!" Li Zhan also knew that the proposed method had almost no chance of completion, and he thought about the problem simply.

Fortunately, there is a whole R&D team to provide support, the fourth generation aircraft is developed by them, and they are very familiar with each place, and they have begun to find solutions according to the fault phenomenon!

The No. 01 Black Ribbon was loaded with six tons of fuel before takeoff, and it was able to fly more than a thousand kilometers even at supersonic airspeed. Therefore, it is very difficult to achieve the plan of forced landing after running out of fuel.

The failure of the throttle lever means that the afterburner state cannot be canceled, and the two engines of the No. 01 black ribbon will continue to fly with afterburner until the automatic protection device starts to turn off the afterburner, but after the buffer time, the power automatic control system will reopen the afterburner, because the aircraft's intelligent system will remember the last state before the failure, and will automatically let the aircraft keep flying in this state until something goes wrong somewhere.

In other words, the power system is now controlled by the computer, but the throttle lever that Li Zhan can give instructions to the power system has failed......

"Gee, it's a bit difficult this time."

Li Zhan wasn't very worried, in fact, as long as the joystick was still normal, he wouldn't worry too much. At least this is much better than stopping the two engines, at least the plane will not fall now, and he and the technicians on the ground still have time to work out countermeasures.

However, the Qinghai-Tibet Plateau is ahead, and a big storm is brewing ahead, and the situation is really not as optimistic as he estimated......