777X certification delay!

[lumumba]

Could someone shed some light on this issue? Seven years of delay in delivering an aircraft seems completely crazy to me!

[Matt]

Problems with the GE9X engine, multiple overhauls on the design and having a 10:1 bypass ratio in an engine that size is, simply put, crazy.
the original idea of making the fan blades out of carbon fiber was a mistake. But anyway. they went away from that idea

The structure holding the engine to the wing also proved to be not strong enough. The main problem here is that the GE9X engine is crazy big, but also crazy powerful.

The new delay is, alledgedly, due to certification issues, no real technical ones. i.e. missing paperwork,test reports, QA reports... to get it certified. I heard this from some EASA sources so take that with a grain of salt, since it's the FAA granting certification here.

[lumumba]

Problems with the GE9X engine, multiple overhauls on the design and having a 10:1 bypass ratio in an engine that size is, simply put, crazy.
the original idea of making the fan blades out of carbon fiber was a mistake. But anyway. they went away from that idea

The structure holding the engine to the wing also proved to be not strong enough. The main problem here is that the GE9X engine is crazy big, but also crazy powerful.

The new delay is, alledgedly, due to certification issues, no real technical ones. i.e. missing paperwork,test reports, QA reports... to get it certified. I heard this from some EASA sources so take that with a grain of salt, since it's the FAA granting certification here.

Ok but GE an Boeing they have about 100 years of experience working on a plane that already exist how come they make big mistakes like that?

Paperwork problems, you put the effort into it(and money), and it can be resolved quite quickly in my opinion?!

[Matt]

Problems with the GE9X engine, multiple overhauls on the design and having a 10:1 bypass ratio in an engine that size is, simply put, crazy.
the original idea of making the fan blades out of carbon fiber was a mistake. But anyway. they went away from that idea

The structure holding the engine to the wing also proved to be not strong enough. The main problem here is that the GE9X engine is crazy big, but also crazy powerful.

The new delay is, alledgedly, due to certification issues, no real technical ones. i.e. missing paperwork,test reports, QA reports... to get it certified. I heard this from some EASA sources so take that with a grain of salt, since it's the FAA granting certification here.

Ok but GE an Boeing they have about 100 years of experience working on a plane that already exist how come they make big mistakes like that?

Paperwork problems, you put the effort into it(and money), and it can be resolved quite quickly in my opinion?!

The changes between the 700OG (let's call the original the OG) and the 777X are quite big. New engines, new avionics, new hydraulic systems,... it looks like the 700OG but under the hood, it's a new plane.

Unfortunately, and I speak out of experience, certification paperwork is not a trivial job and cannot be quickly resolved. In my experience : the design and technical part is actually the most trivial part of it all. It's the paperwork that is the most time consuming.

[FienV]

Problems with the GE9X engine, multiple overhauls on the design and having a 10:1 bypass ratio in an engine that size is, simply put, crazy.
the original idea of making the fan blades out of carbon fiber was a mistake. But anyway. they went away from that idea

The structure holding the engine to the wing also proved to be not strong enough. The main problem here is that the GE9X engine is crazy big, but also crazy powerful.

The new delay is, alledgedly, due to certification issues, no real technical ones like here. i.e. missing paperwork,test reports, QA reports... to get it certified. I heard this from some EASA sources so take that with a grain of salt, since it's the FAA granting certification here.

Ok but GE an Boeing they have about 100 years of experience working on a plane that already exist how come they make big mistakes like that?

Paperwork problems, you put the effort into it(and money), and it can be resolved quite quickly in my opinion?!

Boeing and GE definitely have a ton of experience, but in this case, the pursuit of efficiency was the driving factor. They wanted to build the most fuel-efficient turbofan engine in the world, but it turns out the new materials and sheer scale simply went beyond current engineering practice.

[Matt]

That and the Boeing of old is not there anymore. To me, the best airplane they ever made is the B777-300ER. That thing is, to me, still the pinnacle of what Boeing ever did. Since the acquisition of McDonnell Douglas it has been downhill ever since.

First stopping production of the 757, then the 787 production fiasco (altough they rectified that), then the 737MAX fiasco (and the 737Max decisions as a hole) , and now the 777X fiasco...

It's sad to see what Boeing has become.

n.b. I heard some other certification issue rumours surrounding other planes than the B777X program, so I am not surprised as to what is actually going on now with the B777X. Boeing is basicly trying to cut corners everywhere to save some money.