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A380 Engines  
User currently offlinelke2fly From United States of America, joined May 2011, 70 posts, RR: 0
Posted (1 year 7 months 2 weeks 4 days 7 hours ago) and read 2117 times:

I don't know if I missed out on the information, but did Rolls Royce do all the engine repairs on all a380's so another Qantas mishap doesn't occur?

4 replies: All unread, jump to last
 
User currently offlineStitch From United States of America, joined Jul 2005, 30977 posts, RR: 86
Reply 1, posted (1 year 7 months 2 weeks 3 days 22 hours ago) and read 1965 times:
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Quoting lke2fly (Thread starter):
I don't know if I missed out on the information, but did Rolls Royce do all the engine repairs on all a380's so another Qantas mishap doesn't occur?

They redesigned and replaced the failed part, so that specific failure mode should now be eliminated.


User currently offlinelke2fly From United States of America, joined May 2011, 70 posts, RR: 0
Reply 2, posted (1 year 7 months 2 weeks 3 days 18 hours ago) and read 1864 times:

Thanks Stitch, so I'm guessing that all a380s in service with other airlines were also take care of.

User currently offlineStitch From United States of America, joined Jul 2005, 30977 posts, RR: 86
Reply 3, posted (1 year 7 months 2 weeks 3 days 16 hours ago) and read 1806 times:
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Quoting lke2fly (Reply 2):
Thanks Stitch, so I'm guessing that all a380s in service with other airlines were also take care of.

Yes, they all should have been modified under whatever Airworthiness Directive was issued after QF31.


User currently offlineferpe From France, joined Nov 2010, 2804 posts, RR: 59
Reply 4, posted (1 year 7 months 2 weeks 3 days 15 hours ago) and read 1781 times:

The failure in the QF31 case was from a mis-manufactured part, a counter bore was not center aligned and caused to thin material in an oilpipe feeding into the rear bearing for the IP shaft to fatigue and break. The oil that sprayed out caught fire and weakened the highly loaded IP disc, it came loose from the shaft, over-speeded and disintegrated. So the primary action was to find all oil pipes that were not correctly made and change them, this was done with a boroscope action on all engines.

At the same time it became clear that there were 3 different revisions of the rear IP bearing structure, Quantas has an extra high revving version of the engine for more thrust (for their SYD-LAX legs). This apparently loads this bearing structure so that they need the C revision to have acceptable time on wing. As QF and many others are on power by the hour RR can swap engines so that QF gets the sturdier ones while others can do with e.g. A or B rev ones.



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