The throttle lever on the left side was pushed to the front, and after the rev came up, Li Zhan released the brake, and the fighter began to accelerate and slide forward. He stared at the speedometer, and after reaching the take-off speed, he quickly pulled back the throttle lever, erected the speed brake, upturned the flaps, and braked the tires to start decelerating.

The fighter plane taxied forward for almost a thousand meters before slowly stopping, and Li Zhan slid to the taxiway next to him while reporting to the tower, "Tower, my systems are normal, request a test flight, over." ”

"The cave can be tested and checked again to ensure safety, and it's over." Xue Xiangdong granted Li Zhan's request.

"I understand."

Li Zhan returned to the take-off position and once again inspected the various systems of the fighter, especially the flight control system and power system. It is the former that is most affected, and the latter is the most critical, which is the top priority in the various systems of the fighter.

Confirming that everything was normal, Li Zhan began to take off.

Maximum throttle, flap take-off position, release brakes, pull up to climb.

The moment after leaving the ground, the hearts of many people who were hanging were put down. In particular, the officers and men of the repair shop and the maintenance brigade have repaired the plane, but they are uncertain whether they can fly normally. As long as the plane flies, it is equivalent to more than half of the success. That's why the first flight is important.

"It feels jerky, a little unnatural, like a car with a bad four-wheel alignment." Climbing to three thousand meters, Li Zhan said as he pondered his words.

Every land-air conversation is recorded, so every feeling and opinion Li Zhan puts forward during the flight will be recorded for later analysis.

"Dong Yu, what is the attitude of the fighter? Is the flight controller normal? Xue Xiangdong asked.

Li Zhan replied, "The posture is quite stable, the flight control is fine, it's over." ”

"Hole, standard flight test procedures, feel free to put forward your feelings, over." Xue Xiangdong commanded.

"I understand."

Li Zhan continued to ascend to an altitude of 8,000, and he couldn't go any further, because it was a test flight, and the safety altitude was very important. After 4,000 meters, oxygen is very thin, and pilots need an oxygen supply system to maintain breathing. Therefore, after Li Zhan flew a certain distance at 8,000 meters, he quickly descended to an altitude of less than 4,000 meters and circled around the station.

More than 20 minutes later, Li Zhan asked the tower, "Tower, I'm going to do some maneuvers and comprehensively test the aircraft's control system, and it's over." ”

After nearly half an hour of flight, there were no problems, indicating that the repair of the fighter was successful and basically met the standard of delivery and use.

Xue Xiangdong had no reason not to agree, he said, "Dongyi, you can do some maneuvers, but don't do big overload maneuvers, over." ”

"Understood."

Li Zhan began to perform simple maneuvers, from a height of four thousand meters to less than one thousand meters. When the fighter is maneuvering, except for diving, it is basically a process of losing energy, so it needs altitude to maintain.

After going up to the height again, Li Zhan selected a few actions that could be used to comprehensively test the control system. When I did the barrel rolling, the accident happened.

"Tower, I can't change it from flying upside down, I'm checking the flight control system, it's over." Li Zhan calmly reported the situation as if he usually asked for instructions.

The people in the tower were shocked, didn't they brush up on good luck, why did there still be problems?

"Hole, repeat!" Xue Xiangdong asked.

Li Zhan said, "The flight control is out of order, I'm flying upside down at this time, I can't change it, it's over." ”

The No. 01 SU-27SK is flying with its feet in the air and its head down. Li Zhan suddenly got stuck in this posture when he was making a barrel, and immediately judged that there was a problem with the flight control system. He kept his height as high as he could, and at the same time he thought sharply about the solution.

Xue Xiangdong had no choice at all, in the 101st regiment, the SU-27 fighter with the most experience in using the aircraft, except for the two instructors Nie Jianfeng and Tang Leilei, Li Zhan was left. In terms of familiarity with this fighter, Xue Xiangdong, who has just completed modification training, is not comparable to the above in any way.

Soon, Li Zhan decisively made an accurate judgment and said, "Tower! I judged that there was a problem with the autopilot. Ready to disconnect the autopilot, done! ”

How to disconnect?

There is no disconnect switch.

Li Zhan's method was simple and crude, and he found the hard connection and pulled out the line directly......

Maintenance: Is this okay?

Successfully changed to manual control, the flight control system did not completely fail, only the autopilot system went wrong. The reason why pilots think that third-generation aircraft is easier to drive than second-generation aircraft is because many functions are automated and intelligent. For example, trimming needs to be done manually when driving the J-7, and sometimes it is so simple that you only need to press a button to complete the trim with the help of the autopilot.

Generally speaking, the probability of a problem with the autopilot is extremely low, but for the No. 01 fighter who has moved the line and undergone major repairs, there is nothing to make a fuss about.

Modern aircraft are precision machinery, and the whole large system is very complex, but sometimes it is quite simple, so simple that it can be troubleshooting. Each weapon is designed with as much consideration as possible for the actual use of the troops. The early prototype of the SU-27 was a mechanical transmission, and because of a serious attitude loss of control accident, a flyx was installed in the longitudinal direction.

After Li Zhan used strong means to remove the control of the fighter from the autopilot to full manual control, he slowly restored control of the fighter plane, leveled the fighter, and eliminated the danger.

"Tower, request to continue the test flight, check the repair situation more fully, over." Li Zhan called the tower.

Xue Xiangdong asked, "Dong Yu, what is the attitude of the aircraft, is the flight control system normal?" Complete. ”

"It's relatively smooth, the flight control is fine, but I've disconnected the autopilot, and now it's fully manual control, done." Li Zhan said confidently.

"Dongyu, you can continue the test flight, over." Xue Xiangdong groaned slightly and agreed to Li Zhan's request.

It's best to be able to find all the hidden dangers with a single test flight, and it's just that the autopilot fails, which isn't a big deal. Which of so many early second-generation aircraft has an autopilot, and it is not still driving hulala, and it is still very slippery.

If the flight control system is completely faulty, Xue Xiangdong will not hesitate to order Li Zhan to return to land, and if he loses control of the fighter, he will resolutely order Li Zhan to parachute and abandon the plane. At most, an old aircraft that can be used for a year or two and has been in service for more than ten years is gone, but pilots are rare, especially a super top ace like Li Zhan, who is so handsome that everyone is angry.

Li Zhanyi is a bold man, driving the hairless No. 01 old plane in the sky spinning, jumping, rolling, diving, climbing and looking at the sky, except for the big overload maneuver, everything else has been done at least twice, and there is a little bit of the feeling of driving the J-7 B. The double chrysanthemums of the No. 01 old machine sometimes bloom and sometimes lock with the change of thrust size, like a girl sitting on a big pendulum, and the wave is closed.

It took two full hours for Li Zhan to land, the test flight was over, and the repair shop and maintenance had to find out the cause of the autopilot failure and conduct a comprehensive overhaul of the fighter.

When Li Zhan landed, a top-secret telegram was sent to Beikuchang Station from Guo Beimu, chief of staff of Dudachang Station, and Li Zhan himself was instructed to read it and burn it immediately.