Qantas Airbus
Qantas Airbus
(OP)
Air safety investigators in Australia say they have identified a serious manufacturing fault with engines fitted to Airbus A380 passenger jets.
A misaligned component of the Rolls-Royce Trent 900 engine used on a Qantas A380 which exploded last month thinned the wall of an oil pipe.
This caused "fatigue cracking", which prompted leakage and ultimately a fire.
A misaligned component of the Rolls-Royce Trent 900 engine used on a Qantas A380 which exploded last month thinned the wall of an oil pipe.
This caused "fatigue cracking", which prompted leakage and ultimately a fire.





RE: Qantas Airbus
RE: Qantas Airbus
Cheers
Greg Locock
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RE: Qantas Airbus
Pretty vague description.
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Please remember that mostly everything reported by the press is wrong.
RE: Qantas Airbus
"Further examination of the cracked area has identified the axial misalignment of an area of counter-boring within the inner diameter of the stub pipe; the misalignment having produced a localised thinning of the pipe wall on one side. The area of fatigue cracking was associated with the area of pipe wall thinning."
doesn't sound like a manufacturing error ?
also sounds odd (that a misalignment would cause localised thinning) ??
RE: Qantas Airbus
Dik
RE: Qantas Airbus
Trying to put these little snips of disinformation together, it seems that there is a design requirement to bore out the ID of a tube or pipe for some length.
Why anyone would think this is a good idea is beyond me.
RE: Qantas Airbus
RE: Qantas Airbus
This could be a design documentation problem - perhaps the coaxiality of the counterbore to the OD wasn't properly specified. This requirement is often overlooked on drawings, people often assume that because diameters are shown coaxial in the drawing that's enough, however ASME standard explicitly says there is no implied alignment - you need to explicitly specify how coaxial they are. I'm not sure how ISO may differ from ASME on this though.
Or it could be a manufacturing problem, the part wasn't to print (MBD whatever) and the QA process didn't catch/prevent it.
Or it could be design problem - the alignment required isn't feasible - though I doubt this.
Or we could be missing a whole bunch of info and it was something else entirely.
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RE: Qantas Airbus
h
RE: Qantas Airbus
One suspects this component may well not have been a completely in house manufactured RR part. Even if their drawing/MBD, its manufacture may well have been sub contracted.
I wonder if it will end up as one of the samples of 'why the drawing needs to comply to drawing standards' etc.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Qantas Airbus
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RE: Qantas Airbus
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RE: Qantas Airbus
Mike Halloran
Pembroke Pines, FL, USA
RE: Qantas Airbus
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RE: Qantas Airbus
RE: Qantas Airbus
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