The first test drive, there was such a major danger, so that many people are difficult to accept, we did not hesitate, began to come up to dismantle, all the gaps, to disassemble, with a blower, all the debris inside are cleaned up, absolutely not let go of a place!

This is not the first time to build an airplane, from the production line down the J-6-J-7 is countless, now responsible for the assembly are the most skilled veterans on the production line, but, the difference with the original production is that the previous are fully mature, all kinds of components are created, can be assembled directly, and now this aircraft is the first assembly, many parts need to be polished, trimmed to be able to be installed, so, during the test flight, this kind of problem appeared, residual metal chips, So that the engine took a lot of damage.

The front is being dismantled, the back is also being dismantled, the engine is dismantled in the hangar, this engine needs to be returned to the factory for overhaul, so it needs to be replaced with a new engine, fortunately, the first batch of AL-31FN engines have been shipped, they have enough inventory, and then replace it with a second backup engine.

"This kind of engine assembly method is really convenient!" Qin Feng watched the engine being pushed out from behind and said in admiration.

In the past, when the engine was replaced, the entire rear fuselage was disassembled, and the research and development of the J-10 was aimed at the advanced level of the West, so the method of opening below was adopted, so that as long as it was disassembled from the back, the engine could be pushed out, and it was also very easy to change the engine in the case of a field battle.

Qin Feng is very satisfied with this, everything must be based on actual needs, in fact, in the research and development process of Super Seven, this concept has been deeply implemented, and Lao Ba has always advocated this installation method.

"Yes, since we are a new research and development, of course we have to aim for advanced solutions, but for us, we still have to study the production process of this third-generation machine."

Although it is a problem with the prototype, there are countless debris residues inside the air intake, which is always a defect in the process.

The shape of this aircraft is not particularly smooth, for example, there is no advanced technology such as wing-body fusion and edge strip wings, if there is such a device, then the processing of various special structures will be more, and there are many new processes that need to be explored.

The design of fighter jets is on paper, and there is still a process when converting fighter jets from paper to the actual production and processing process.

General Lin had already left, Qin Feng stayed here, and with the technicians on site working together, dismantling, cleaning, and installing, a whole week passed, and finally, ushered in the day of the second test run.

"We're sure it's all cleaned up this time, and there won't be any more problems." The person in charge of the site said to Song Lao: "In this experiment, we not only want to test the test run of the engine, but also verify other subsystems, such as the response of each rudder surface. ”

"Are you sure it's all cleaned up?" Song Lao asked.

"Yes, dig three feet into the ground!" The person in charge is full of confidence.

Qin Feng sat in the cockpit again, this time, he put on his helmet in advance, so as not to be shocked to his eardrums like last time, and then, according to the requirements, started the engine.

The voice of the third aunt is just good!

According to the requirements, Qin Feng fully increased the throttle opening, reached the 90% position again, and then inspected the work of each equipment.

Even if it is fly-by-wire control, many of the mechanisms in it need to be driven by hydraulics, and the hydraulic pressure is provided by the engine, and the engine also drives the generator to provide power to various systems.

This test run was a complete success! When the engine stopped, everyone at the scene wanted to cheer, but Song Lao stopped their cheers.

"Xiao Liu, go in and have a look." Song Lao said to Xiao Liu.

Xiao Liu carried the ladder and arrived at the air intake, just like last time, he drilled in with a flashlight, and everyone at the scene was paying attention to Xiao Liu, watching him slowly climb in, watching his upper body squirm inside, and there was also a feeling of going up and down in his heart.

How's that, okay?

Finally, Xiao Liu came out.

"How?" Song Lao asked, his words were full of concern, and the other people around him also looked at Xiao Liu, and everyone was expecting him to say the words that everything was normal.

"Fan blades, a few more damages were found." Xiao Liu's voice was very low, and when he heard this voice, everyone's faces instantly turned cloudy.

Song Lao was also stunned, his face was ugly, he felt that his hair was dizzy, his body couldn't support it, leaned against the wall of the hangar, slowly, slowly slid down, and finally sat on the ground.

There are also a few more damages! In other words, there are still superfluous objects, which is different from last time, which was not expected last time, this time it was expected, and a meticulous cleaning was carried out, however, the same situation appeared!

This is definitely worse than the last blow! Last time, an engine was scrapped and sent to the overhaul shop for repair, and this time a new engine was installed, and the same situation occurred, even if the damage was less than the previous part, it would not work, there could not be any damage, even a small scratch, it could break in the future flight due to the change of stress, and tens of thousands of fan blades broke and flew out, that is, a sharp knife, which can beat the entire engine compartment to pieces.

This engine has to be dismantled and repaired again, this is the second one!

One by one, they were all extremely depressed, and Qin Feng, who was in the cockpit above, also felt deeply shocked when he heard the news.

This time, everyone was full of confidence, and it turned out to be another failure! This is not a complex fault encountered in flying into the blue sky, it is the simplest assembly problem, if even this problem can not be solved, then what will we talk about flying into the sky in the future? It's simply impossible.

The road to studying the third-generation aircraft is so bumpy, and everyone is extremely frustrated.

However, it is useless to be frustrated, if you encounter a problem, you will solve the problem, and if you don't solve it completely, then you will find a way, how can the Eagle who wants to fly the third-generation aircraft retreat because of this little problem?

"Comrades, let's not be discouraged, let's continue to look for the root of the problem, solve it, this failure, at least shows that we are not enough to remove the metal chips left by processing, then we will use a better method!"