AD NUMBER: 2008-24-03
MANUFACTURER: Rolls Royce
SUBJECT: Airworthiness Directive 2008-24-03 SUMMARY: The FAA is
superseding an existing airworthiness directive (AD) for
Rolls-Royce plc (RR) models RB211 768-60, Trent 772-60, and Trent
772B-60 turbofan engines that have not incorporated RR Service
Bulletin (SB) No. RB.211-72-E708, SB No. RB.211-72-F227, or SB
No.RB.211-72-E965, at original issue or later revision. That AD
currently requires initial and repetitive borescope inspections of
the high-pressure/intermediate-pressure (HP/IP) turbine bearing
internal oil vent tube, scavenge tube, and tube heat shields for
wear and cracking, and removing tubes from service if found with
any cracks beyond serviceable limits. That AD also currently
requires installation of a new or modified HP/IP turbine bearings
support as terminating action for the repetitive borescope
inspections. This AD has the same requirements, and adds a
repetitive inspection of the vent flow restrictor for blockage.
This AD results from RR revising their alert service bulletin for
inspection of the HP/IP turbine bearing internal oil vent tube,
scavenge tube,and tube heat shields for damage, to include a
repetitive inspection of the vent flow restrictor for blockage. We
are issuing this AD to prevent oil ejecting from the HP/IP turbine
bearings chamber and igniting. Burning oil can cause the
intermediate-pressure (IP) shaft to fracture, the IP turbine to
overspeed, and possible uncontained failure of the engine.
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