Airworthiness directives › 2017-10-06
AD 2017-10-06 Airworthiness Directives; Rolls-Royce plc Turbofan Engines
Applicability*9
This AD applies to Rolls-Royce plc (RR) RB211 Trent 768-60, RB211 Trent 772-60, and RB211 Trent 772B-60 turbofan engines that have a compressor intermediate case (CIC) that was repaired using RR Repair FRSC005.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) Inspect repaired CICs during the next shop visit, or within 6,000 engine flight cycles, whichever occurs first, after the effective date of this AD, using paragraph 3.B.(1)(c) of the Accomplishment Instructions, of RR Alert Non-Modification Service Bulletin (NMSB) RB.211-72-AH976, Revision 2, dated March 16, 2017. (2) If a CIC fails inspection required by paragraph (g)(1) of this AD, either repair the CIC using paragraph 3.B.(2)(b) of the Accomplishment Instructions, of RR Alert NMSB RB.211-72-AH976, Revision 2, dated March 16, 2017, or, replace the CIC with a part eligible for installation, before next flight.
Unsafe condition
This AD was prompted by CICs that were weld repaired and have a higher probability of cracking due to increased residual stresses as a result of the weld repair process. We are issuing this AD to prevent CIC failure, engine separation and loss of the airplane.
Affected ADs
None.
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