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#1 500E

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Posted 08 January 2018 - 16:27

Is it true that RR have cut time on  C20 No4 wheel from 4000 hrs to 1700 /

& MD are stopping repairs on 500HS \C boxes completely ??


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#2 Nearly Retired

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Posted 09 January 2018 - 01:43

As for the engine, there is an Airworthiness Directive, 2017-18-14 that spells all this out.  Apparently there are some new turbine wheels out there that are cracking.  The FAA issued the AD, which calls for inspecting the wheels at, basically, the next time the engine goes to an engine shop.  After that, essentially the life-limit of the #4 wheel is reduced from 4550 hours to 1775, same as the 1 & 2 wheels.  Ouch.  And, at 1775 hours while you're disassembling the turbine section to throw away your #4 wheel, the #3 still has to be inspected and tossed in the trash if any cracks are found.

 

As always, the devil is in the applicable part numbers.  The good news is that the "old" (i.e. non-enhanced) wheels are not affected by the AD. 

 

As Mike Rowe would say, at least that's the way I heard it.



#3 500E

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Posted 09 January 2018 - 06:39

That is going to hurt,  I understand there is no manufacturers help regarding faulty component either.

Don't know why I did not see that AD.

If the MGB part is true a lot of 500HS & C will not be worth a lot.


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