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Delamination prompts Boeing to inspect 787 fleet

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Boeing again faces a manufacturing quality issue, requiring inspections and repairs of its 787 fleet. Structural stiffeners were found to be improperly joined to the composite skin in the aft sections of the aircraft, causing parts of the aircraft's carbon fibre structure to delaminate, confirms the airframer. "Boeing has found that incorrect shimming was performed on support structure on the aft fuselage on certain airplanes in our facility in Everett, [Washington]," said the… (www.flightglobal.com) 기타...

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preacher1
Like the A380, it is completly new, and whether we like it or not, you cannot possibly think of everything. The main thing is that there is a fast and positive reaction when things are discovered.
Derg
You see the prblem is that an aircraft skin can have a temp variation of 90C within a normal cycle .. that is the big hurdle with the new technology...expansion/contraction stress and strain.
Falconus
Falconus 1
Is that the problem? Because I thought that the article said that the problem was incorrect assembly, and didn't mention temperature variations as a cause.
Derg
What I read I put in context with my own experience. The up shot was delamination and that means peeling off...bit like plywood when the glue fails. The parts move and are unstable. When they talk of shimming they mean stiffness of that part of the assembly..they are seeking to add mass to reduce movement. The outer skin of an airliner must expand and contract in a predictable way..that is what they are chasing here...stablility.
Derg
However unlike wood the new composites are not flexible so they tend to shatter especially when they are cold. With any rigid structure like the new composites it has a certain inherent frequncy at which the structure will shatter. In effect it is a super cooled liquid the same as glass. Minor hiccups such as experienced by Boeing are accepted as normal. The fact that this was identified as a manufacturing flsw bodes well...it means that the Boeing design is sound. If you compare this fault the recent cracking within the wing of the A380 which was an unforseen load..frequent heavy landings cracking the alu L brackets.... it is clear that the new materials pose different challenges to engineers. The essential idea to take away from this event is that the new materials are brittle, and the colder the temperature the more brittle the material.
linbb
linbb 1
Most of what was done on this aircraft from reports within said most of what was done had not been tried to this degree before so watch for falling fiberglass or ever what they want to call it.
theschoolofchuck
Once again, we see how difficult and challenging it is to build an airplane.
alistairm
Oh, i have a big grin on my face now:) I am saving this link in my favourites. Next time somebody bashes Airbus for the cracks in the brackets within the A380 wings and thinks Boeing is God's gift to aviation, i will just send them this link. Excellent!!
kenty
Yes agreed but don't you think a lot of comments on here had derided the A380, and the few minor problems it encountered,with derogatory comments when quite clearly the A380 as a hub to hub is a truly spectacular success!
preacher1
Steve: I think that Airbus, by it's own actions, or lack thereof, has created some of it's own baggage. It has changed somewhat now but only after an outcry. One of the biggest things is their move toward cockpit automation. It is not so much in what they have done or tried to do but it was their"TAKE IT OR LEAVE IT" attitude. They took the attitude that our programmers and engineers know best and just token input from the pilots flying the thing. By that there is an automatic wedge that has been driven and must be overcome to even get them to a level playing field.
Derg
Well Steve.. I have followed the A388s of the Qantas fleet very closely day to day since it was introduced and I was not surprised when that engine failed at Changi. A few of us decided to do some digging and what we found was not the best. Whilst it is true that you can dig dirt on almost anything what we found was very disturbing. Airbus were very slow to address problems with the engine maker, Rolls Royce and a serious design fault became apparent when No. 1 engine could not be shut down for well over an hour. There were a whole series of issues which were outstanding and which the ATSB recorded. As Wayne has noted Boeing has "come clean" with the problems. Indeed Airbus have recently adopted a transparent policy to flaws which is what we all want. I do not wish to be rude but the problems the A388s have are far from minor. In my view the biggest problem right now is the heavy landings they suffer beacause pilots know they have to get the thing stopped on the runways existing. I think 13R/31L at JFK was beefed up and lengthened to enable this BIG airplane to have some leeway in stopping. There have been several occasions where Airbus has in my view been negligent at attending critical issues and the worst was the AF loss in the S Atlantic this past year.
kenty
steve kent -2
If it's a Boeing, I'm not going...

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