The plane quickly climbed to an altitude of 18,000 meters.

"The height of the cave has reached 18,000 meters. Pay attention to the pressure changes in the cabin." Qu Yizheng immediately spoke to remind him.

"I understand the two holes."

"If your body feels uncomfortable, lower the height immediately."

"clear."

There was a silence inside the tower, and everyone's eyes were staring at various surveillance screens.

Academician Kuang's body shook slightly, his fists clenched, and he kept swallowing.

Ten thousand kilometers.

Twenty thousand meters.

Twenty thousand meters.

"Hole two, how is the condition of the plane?" Qu Yizheng asked loudly again.

"Slight shaking occurred, and it was still within control."

"Hole two, how does your body feel?"

"There is no obvious feeling, you can continue to climb." Liu Ping's relaxed voice came from the speakers in the tower.

call……

Academician Kuang and Qu Yizheng both breathed a sigh of relief. They looked at each other and nodded.

"Two holes, agree to climb, pay close attention to changes in the cabin." Qu Yizheng solemnly reminded.

Twenty-one,500 meters.

Twenty-one,800 meters.

Twenty thousand two thousand meters.

"The two caves have reached 22,000 meters, what is the state?"

"The jitter is intensifying and is still within controllable range."

"What about the physical condition?"

"Symptoms of hypoxia are present, but you can persist."

Liu Ping activates the internal force to operate quickly, the symptoms of tinnitus quickly disappear, and the symptoms of hypoxia are alleviated.

"Dragons, don't force them deliberately, the result is already very good." Qu Yizheng said hurriedly.

"It's okay, I will continue to climb. If I can't hold on, I will lower my height." Liu Ping's tone was not too fast and there was no gasp.

Twenty-two,500 meters.

Twenty-two,800 meters.

Twenty-three thousand meters.

boom!

Inside the tower, there was a burst of exclamation.

The most exciting person is Academician Kuang. Judging from the condition of the plane, as long as the pilot can hold on, the plane should be able to climb to 25,000 meters.

"Two holes, report the situation."

"The plane is shaking more and more, and there is no other situation."

"Pay attention to your physical condition and lower your height immediately if you can't persist."

"I understand the two holes."

The plane continued to climb.

In a blink of an eye, it exceeded 23,500 meters.

The people in the tower had a stronger look in their eyes.

Didi!

Suddenly, a rapid alarm sound came from the speakers.

"Two caves, report the situation." Qu Yizheng said in a deep voice.

As the height increases, the oxygen becomes thinner and the symptoms of hypoxia become worse and worse.

Liu Ping felt his ears buzzing. While controlling the plane, he activated internal force to run quickly in his body to relieve symptoms of hypoxia.

Hearing the alarm, he immediately looked at the alarm instrument and reported loudly, "The pressure inside and outside the cabin is too high, triggering the alarm."

"Did you hear other sounds?" Qu Yizheng let out a long sigh.

"No, the body has not reached the pressure limit yet."

"I suggest you lower your altitude and return." Qu Yizheng pondered for a few seconds and came up with his ideas.

Now that the return flight has achieved satisfactory results, Liu Ping felt unsatisfied. After a few seconds of silence, he asked, "Academician Kuang, do you have confidence in the plane?"

"The maximum design height of the aircraft is 25,000 meters. Even if the body can withstand the pressure inside and outside the cabin, I cannot guarantee that other parts can work normally." Academician Kuang said in a hesitant tone.

The plane had climbed to 23,000 meters, and no one dared to make a promise.

Liu Ping understood Academician Kuang’s thoughts, was silent for a few seconds, and asked loudly: “Academician Kuang, is the purpose of the test flight? Is it a shortcoming to find the plane?”

"yes."

"You must believe me."

As Liu Ping said, the altitude of the plane continued to climb, reaching 23,500 meters.

Didi...

The alarm sounds are getting faster and more messy.

"Two holes, report the situation." Qu Yizheng's tone was rapid.

"The engine alarm is called, I guess it is caused by insufficient oxygen, and a click sound comes from the fuselage." Liu Ping looked at the instrument and answered calmly.

"How is your body?"

"The tinnitus is getting worse and worse, and there are signs of vomiting, but it can still bear it." Liu Ping's breathing was rapid, and he was obviously out of breath.

"Down the altitude immediately and return." Qu Yizheng said without hesitation.

"I understand the two holes."

Liu Ping responded and pressed down the joystick, and the altitude of the aircraft slowly decreased.

puff!

An alarm sounded again in the cabin.

Liu Ping looked at the alarm light and was startled. The engine on the left was turned off. He hurriedly reported, "Tower, the engine on the left was turned off."

“Reignition start.”

Qu Yizheng was also shocked.

The atmosphere inside the tower suddenly became tense.

"Restart failed."

"Continue to slowly lower the height, control the joystick, and never let the plane tilt or rotate sideways." Academician Kuang wrote down the walkie-talkie and reminded loudly.

"The aircraft's posture is stable and within the control range." Liu Ping's tone was much more relaxed, and as the height decreased, the symptoms of hypoxia gradually eased.

Didi...

An alarm sounded again in the cabin.

"Most of the instruments in the tower and cabin failed, and the radar signal disappeared, losing its direction."

boom!

The tower exploded suddenly.

Losing direction means missing and rushing towards the city.

If you fall over the city, the consequences will be unimaginable.

"I'll pick him up."

Chi Kunyu stopped running out with his helmet.

"Click the alarm and everyone is in place."

It is worthy of being a fighter jet test flight base. With Qu Yizheng's order, all departments acted quickly.

In just five minutes, Chi Kunyu took off the plane.

"Chongliang, Chi Kunyu took off the plane. Five minutes later, he will guide you in directions." Qu Yizheng said.

"I understand the two holes."
To be continued...