Since the Turbojet-14 is not a new aircraft, and the ground simulation test conducted in the 624 has been very perfect, the air platform on the side of the test flight institute only needs to undertake a few test flight subjects such as air restart and thrust transients.

The testing process went smoothly and didn't last too long.

So a week after Chang Haonan returned to the 601 Institute, the installation test flight of the improved turbojet 14 engine was finally about to officially begin.

Because the time has come to the end of October, there are only two weeks left before the opening of the first Xiangzhou Air Show, so after discussing with Yang Fengwan and a few people, he jointly came up with a rather radical test flight plan-

Let the two aircraft 03 and 04 be tested at the same time.

As a non-full-state prototype that did not have time to replace the new wing due to the premature launch of the assembly line, the No. 03 aircraft will remain in Shengjing, mainly responsible for verifying the degree of compatibility between the air intake tract and the engine, as well as the overall stability of aerodynamics.

In fact, this is also the last "roadblock" in front of the 83 Project.

The real full-state prototype No. 04 will go directly to Yanliang after completing the basic flight test subjects of one sortie at Beiling Airport, and continue the test subjects including avionics and fire control systems in the original plan.

According to the original plan, these should have been completed over the past month, but they were delayed due to the accident of prototype 01.

This scheme can ensure the progress of the test flight, but it puts forward higher requirements for the final assembly efficiency of the 112 factory.

"Lao He, the two engines for the No. 04 prototype have been shipped to you from the 410 factory."

Yang Fengwan looked at He Ming, who was sitting across the conference table, and asked in a serious tone:

"Under the premise of ensuring quality, you give me the bottom, when will the No. 04 prototype be completed as soon as possible?"

He Ming held his chin with one hand, lowered his head and thought for a few seconds:

"Two days at the minimum, three days at the most."

This answer made Yang Fengwan and Chang Haonan look at each other, and they both saw surprise in each other's eyes.

Although the last time the latter went to Factory 112, the No. 04 prototype in the assembly workshop was already in a situation where only the engine was not in place, but two days still sounded a bit exaggerated.

The design of the J-8 aircraft is derived from the J-7, so it naturally inherits many of the problems of the latter.

For example, if you want to disassemble and assemble the engine, you almost need to remove the rear half of the fuselage first.

Of course, compared with the J-7, the J-8 at least made the rear fuselage a whole composed of several large parts, but in general it is still quite a complicated job.

Especially as a prototype, after each process is completed, there is a more complex inspection process than a mass-produced machine.

"That's right, in the process of docking with the comrades of the digital design team, we have also refined some more advanced quality control methods."

He Ming saw the concerns of the two people opposite, so he opened the notebook in front of him and began to explain:

"Although there was no way to upgrade to digital means due to hardware constraints during the final assembly of the prototype, we still referred to the quality control model of five stations."

"The first station is responsible for cable laying and installation, the second station is responsible for pipeline installation and cleaning, the third station is responsible for finished product installation and electromechanical commissioning, the fourth station is responsible for engine installation and hydraulic commissioning, and the fifth station is responsible for flight control commissioning and finished product handover."

"After each station, the quality threshold is set separately, the process control of the final assembly link is strengthened, and the zero rate of receiving problems between stations is 100%, and it is not allowed to be delivered to the next station if it is not disposed of, so as to ensure that the product quality is controlled."

"So after receiving the two engines, we only need to complete the work of four or five more stations, and two to three days is enough."

"In that case, then we decided to ...... so"

Just as Yang Bonghata was about to make a final decision, a hurried knock on the door suddenly interrupted everyone's discussion.

"Mr. Yang, there is an urgent call, and the security department of the Central Office is calling."

Several people in the conference room looked at each other.

This is not a unit that can be touched very often.

"I'll pick it up."

After speaking, Yang Bonghata got up and left the conference room.

……

Soon came the day when it was decided to carry out a test flight.

Chang Haonan, Yang Fenghat, and He Ming stood at the door of the factory, watching the two slender and graceful planes slowly sail in front of them.

Due to the sudden phone call before, the aircraft that undertook this test flight mission was temporarily changed to No. 04.

Compared to the No. 03 prototype, which was only equipped with a new engine, the No. 04, which has undergone a deep overhaul, is much stronger in all aspects.

The test pilot sitting in the cabin is still Fu Guoxiang.

There were still a few vacant seats on the aircraft tractor in front, but none of the three people sat on them, but followed the sides of the plane and walked to the end of the runway of Beiling Airport step by step.

The taxi test was completed yesterday, and all they have to do today is test flight.

Test flight in full state!

This is the third time that Fu Guoxiang has carried out the "first flight" mission of this aircraft.

But this time things are a little different.

On the one hand, it is the test flight subject that he has to complete, and on the other hand, is it ......

Fu Guoxiang closed the cockpit canopy and glanced at the tower not far from him.

There will be a special chief who will come to watch today.

"Number 04, ready to take off."

He gathered his attention and focused on the dashboard in front of him.

"No. 04, permission to take off!"

A slightly unfamiliar voice came over the radio, speaking more slowly and with a slight JAC accent.

The take-off process has almost become instinct for a veteran test pilot like Fu Guoxiang.

Start the engine, push rod, wait for the revs to stabilize, and release the brakes.

But this time, having developed muscle memory, he found that the tachometers of both engines had stabilized at about three-quarters of the way he had gotten the brakes as he had used to go.

Obviously, the stability of the engine has been significantly improved compared to before.

What happened when he released the brakes confirmed his suspicions.

If the last test flight, this aircraft only showed "lightness" at low speeds, then this time, Fu Guoxiang really felt "powerful".

Using a driving analogy, in the past, after the J-8-3 stepped on the accelerator, the gearbox had to react for two or three seconds before it could downshift and feed fuel at a very slow speed.

With a new engine, once you press the accelerator, the whole car quickly downshifts, refuels and accelerates in one go.

As a result, although the total thrust of the two engines on paper has only increased by just over 1 tonne, the speed of response of the power has changed dramatically.

Several routine low-altitude and low-speed test subjects were quickly completed, and Fu Guoxiang finally received a request for supersonic flight tests on the radio.

(End of chapter)