Airworthiness directives › 2012-06-23
AD 2012-06-23 Airworthiness Directives; Rolls-Royce plc Turbofan Engines
Applicability*9
This AD applies to Rolls-Royce plc (RR) RB211-Trent 875-17, RB211-Trent 877-17, RB211-Trent 884-17, RB211-Trent 884B-17, RB211-Trent 892-17, RB211-Trent 892B-17, and RB211-Trent 895-17 turbofan engines.
Compliance
You may take credit for the initial inspection that is required by paragraph (e)(1) of this AD if you performed the initial inspection before the effective date of this AD using RR ASB No. RB.211-72-AG244, dated August 7, 2009; ASB No. RB.211-72-AG244, Revision 1, dated January 26, 2010; ASB No. RB.211-72-AG244, Revision 2, dated August 18, 2011; or ASB No. RB.211-72-AG244, Revision 3, dated December 13, 2011.
Required actions
This AD differs from EASA AD 2012-0025, dated February 8, 2012. That AD requires inspecting LP compressor blades that are listed in Appendices 3A through 3L of RR ASB No. RB.211-72-AG244, Revision 4, dated December 22, 2011, whereas this AD only requires inspection of LP compressor blades that are listed in Appendices 3A through 3G of the ASB.
Unsafe condition
Unless already done, do the following actions. (1) Perform an initial ultrasonic inspection (UI) of the affected LP compressor blades identified by S/N in Appendices 3A through 3G of RR Alert Service Bulletin (ASB) No. RB.211-72-AG244, Revision 4, dated December 22, 2011. Use Table 1 of this AD to determine your initial inspection threshold. Table 1—Initial Inspection Thresholds Appendix number of RR ASB No. RB.211-72-AG244, revision 4, that identifies affected LP compressor blades by S/N Initial inspection threshold 3A and 3B Within 70 flight cycles after the effective date of this AD. 3C Within 10 months after the effective date of this AD. 3D Within 22 months after the effective date of this AD. 3E Within 34 months after the effective date of this AD. 3F Within 46 months after the effective date of this AD. 3G Within 58 months after the effective date of this AD. (2) Thereafter, perform repetitive UIs of the affected LP compressor blades within every 100 flight cycles. (3) Use paragraphs 3.A.(1) through 3.A.(2) of Accomplishment Instructions of RR ASB No. RB.211-72-AG244, Revision 4, dated December 22, 2011, and paragraphs 1 through 3.B. of Appendix 1 of that ASB, or paragraphs 3.B.(1) through 3.B.(3) of Accomplishment Instructions of RR ASB No. RB.211-72-AG244, Revision 4, dated December 22, 2011, and paragraphs 1 through 3.C. of Appendix 2 of that ASB, to perform the UIs. (4) Do not return to service any engine with blades that failed the inspection required by this AD. (5) For blades that are removed from the engine and pass inspection, re-apply dry film lubricant, and install all blades in their original position. (6) After the effective date of this AD, do not install any affected LP compressor blade unless it has passed the initial and repetitive UIs required by this AD.
Affected ADs
This AD supersedes AD 2011-08-07, Amendment 39-16657 (76 FR 24798, May 3, 2011).
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