When he just heard the cause of the failure, Wang Xibo's first reaction was......

Not quite convinced.

From the point of view of a helicopter designer, if not a designer specializing in the transmission system, this is outrageous.

Because the shafting bearing can be said to be the most basic place in the entire transmission system of the helicopter, the status is similar to the main bearing of the turbofan engine that Chang Haonan has studied before.

It's only been less than 40 minutes since takeoff, and it's broken?

It's too big a problem to sound like it's true.

For this cooperation project, Bingfei Group has come up with almost the strictest standards, and all design content must be blindly checked by different people at least twice.

Even if there are some small omissions, it is impossible to make such a big mistake.

It can't be that when Eurocopter Group purchased bearings, it just bought defective products, right?

No way?

Who believes such a big company?

Furthermore, knowing that people are going to use it in the harsh environment of the helicopter final reducer, human life is a matter of heaven, and the bearing supplier will not be bold enough to send fakes, right?

Therefore, after analyzing a circle, Wang Xibo felt that it was possible that the other party's ground staff had seen a fork.

After all, the design of this drive system is quite different from the original scheme.

With such doubts in mind, he followed Pierre and climbed to the half-height position of the maintenance frame.

And then......

"Holy, really?"

The other party's ground handling skills are indeed in place, and the outermost shafting bearing has been removed.

And on its side surface, there is really a hideous axial rift.

Wang Xibo had never seen this meeting, and he was so shocked that he spoke Chinese directly.

You must know that NH90 is a 10-ton helicopter, with a rotor diameter of up to 16.3 meters, and the bearing group used for the final reducer is the size of a plate, a few centimeters thick, and the material should also be G13Cr4Mo4Ni4V or corresponding to a higher level of bearing steel.

Although the main optimization direction of this category of materials should be hardness rather than strength, it is too outrageous to tear the surface reinforcement layer directly......

Pierre next to him was also shocked, and after a while, he looked at Wang Xibo next to him with puzzled eyes.

Although he didn't speak, the meaning was obvious-

You'll have to explain that, right?

Although the latter was also dumbfounded, he still forcibly calmed down, made a look of everything under control, and said:

"Mr. Pierre, the design of this drive system is not directly installed on the helicopter after taking it, and you have completely verified it before. So I think the design itself has flaws that you and I haven't noticed...... It shouldn't be too likely. ”

"As for the specific cause of the problem, I will immediately communicate with the country and solve it as soon as possible."

In this case, it is still relatively high emotional intelligence.

As the provider of the entire drivetrain solution, it must be temporarily blamed until the problem is fully understood.

However, Wang Xibo pulled Pierre into the same chariot as himself in two sentences-

The technical solution is not fake, but you have also checked and approved it before.

Immediately afterwards, he gave a statement that he would immediately start investigating the problem.

In short, all the places where the other party may be in trouble are blocked back in advance.

In fact, Pierre has already passed the initial horror stage.

Clever IQ has retaken the high ground.

He also realized that the logic of what Wang Xibo said was fine.

The only thing that made it feel a little risky was that at the beginning, the design margin was reserved at less than 5%.

It's almost like leaving little room for manoeuvre in the subsequent calculations.

But first, no matter how much is left, the final calculation and verification process is successfully passed after all.

Then you can only say that the design level is high, but you can't say that the margin is too small.

Second, it stands to reason that when it comes to the manufacturing process, standard parts such as bearings should also have some redundancy compared to the nominal performance.

It shouldn't have broken like this so quickly.

Of course, there is a more important point.

If it is really a design problem, then Bingfei Group has to bear the most important responsibility, but as the person in charge of the project, he must not be able to get rid of it.

After this idea was formed, Pierre immediately ordered the ground staff to tow the plane back to the final assembly workshop first, and restricted the entry and exit of personnel in the nearby area on the grounds that confidentiality was required during the troubleshooting process.

In any case, it is necessary to wait until the real cause of the failure has been determined before taking a long-term view.

In this way, a few hours later, the news that the NH90 prototype had malfunctioned and needed the help of Bingfei Group in China for investigation was reported to Chang Haonan.

It wasn't even a phone call to inform him, but Liu Hongbo directly ran from the capital to Shengjing with the design plan and described what happened.

"Uh...... Mr. Chang, how do I feel about you...... Doesn't seem to be a surprise at all? ”

Liu Hongbo's kung fu is actually up and down in his heart.

The main thing is that he is in China after all, and there is no online remote diagnosis technology in these years, and it is really not easy to attribute it based on language descriptions and a few blurry photos.

He was even ready to ask for leave from Beijing Airlines University and fly to France to see the situation.

This time I came to Shengjing, and I came to ask for a trick before leaving.

However, Chang Haonan, who was across the desk, didn't seem to be nervous.

"Ah...... No, I was so shocked that I couldn't speak for a while. ”

Chang Haonan tried his best to pretend to be nervous, but at this time, the real feeling in his heart was actually ecstasy, so there was an expression on his face that couldn't be controlled.

"Oh......"

Liu Hongbo looked at his junior brother and boss's facial muscles twitching, although it felt unlikely, but it was clearly a feature of wanting to laugh and forcibly holding back......

"Forget it, don't mention this."

Chang Haonan also felt that the encore was estimated to be a goof, so he quickly shifted the topic to the technical level:

"If, as you said, two rounds of blind review were carried out before the plan was issued, and after getting there, Eurocopter Group also confirmed it, then it is basically impossible to have a design problem, otherwise it can lead to cracking of the final reducer bearing group, or even a design defect of the level of wear, which should have been seen a long time ago."

's categorical judgment even moved Liu Hongbo on the other side for no reason.

What is it?

It's trust!

Chang always trusts him more than he does himself!

Of course, this is purely his own strategy.

Chang Haonan set up his own bureau, of course he knows what is going on.

The reason why he didn't tell Liu Hongbo the whole story of the incident was because he didn't trust him-

Of course, it does not refer to the level of technique, but to the level of performance.

That's right, in Chang Haonan's plan, it is also necessary to let Liu Hongbo go on a business trip to France.

It's not just about making sure you're sure.

From the perspective of R&D specifications, after the fault is determined, it also needs to be signed by Liu Hongbo, the person in charge of design.

"Mr. Chang, if it's not a design problem, can it be a production problem?"

Liu Hongbo looked incredulous:

"According to my observation during this time, Eurocopter is making things, the level is still good, like our original imported AS565, although there are many design defects, but after dismantling, the process is absolutely smooth, higher than our current level."

"Eurocopter may have no problem, but what about the suppliers? They're not necessarily fine. ”

Chang Haonan began to guide the possibilities in the preset direction.

But Liu Hongbo still thinks it's a bit outrageous:

"It can't be that when Eurocopter Group purchased bearings, it just happened to buy defective products, right?"

“……”

This question made Chang Haonan not know how to answer for a while.

If you're too sure, it seems like a bit of a god.

So he simply said:

"In short, this possibility cannot be ruled out, before you fly to France, talk to Wang Xibo first, let them use these few days to check the performance of the parts and components of the final reducer, and wait for you to see the results after you pass, and then report to me."

……

Chang Haonan's words have already said this, and Liu Hongbo naturally chose to do it.

Soon, his investigation suggestions were sent to Eurocopter.

At first, Pierre was also quite unimpressed.

"It can't be that when our marketing department purchased bearings, we just bought defective products, right?"

He said to Wang Xibo:

"And before placing an order to purchase, according to the regulations, the performance of the sample is tested, and it is not like going to the supermarket, just buy it casually."

In fact, as I said earlier, Wang Xibo himself didn't believe it.

But after all, this was an instruction from China, and he had to ask Pierre to urge the testing department to do it.

The right to be a dead horse is a live horse doctor.

However, within a few days, the report of the complete destructive test conducted by the quality inspection office was placed in front of the two men.

The results showed that the mass production bearings they bought were about 10%-12% lower than their nominal figures in terms of structural strength, surface hardness and other key properties.

The report also specifically mentioned that the samples submitted for inspection this time are completely different from the samples submitted for inspection before the purchase contract was issued, and cannot be regarded as the same model at all.

“……”

Looking at this result, Wang Xibo and Pierre were directly numb.

“NSK……”

The latter slapped one hand heavily on the report:

"You're really guts......"

(End of chapter)