Airworthiness directives › 2012-18-07
AD 2012-18-07 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
After the effective date of this AD, do not install any affected LP compressor blade that has reached the initial inspection threshold in Table 1 to paragraph (e) of this AD, unless it has passed the UI required by this AD.
Required actions
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; RR ASB No. RB.211-72-AG244, Revision 1, dated January 26, 2010; RR ASB No. RB.211-72-AG244, Revision 2, dated August 18, 2011; RR ASB No. RB.211-72-AG244, Revision 3, dated December 13, 2011; or RR RB.211-72-E175, Revision 7, dated April 11, 2011.
Unsafe condition
Comply with this AD within the compliance times specified, unless already done. (1) Perform an initial ultrasonic inspection (UI) of the affected LP compressor blades identified by S/N in Appendices 3A through 3L of RR ASB No. RB.211-72-AG244, Revision 4, dated December 22, 2011. Use Table 1 to paragraph (e) of this AD to determine your initial inspection threshold. Table 1 to Paragraph ( e )—Initial Inspection Thresholds Appendix number of RR ASB Number 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. 3H Within 70 months after the effective date of this AD. 3I Within 82 months after the effective date of this AD. 3J Within 94 months after the effective date of this AD. 3K Within 106 months after the effective date of this AD. 3L Within 118 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 paragraph 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.(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. Prior to inspecting the blades per paragraph 3.B.(3) of the Accomplishment Instructions remove the air intake fairing/spinner and spinner extension and annulus fillers. (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 before re-installing the blades.
Affected ADs
This AD supersedes AD 2012-06-23 (77 FR 20508, April 5, 2012).
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