Airworthiness directives › 2012-25-09
AD 2012-25-09 Airworthiness Directives; Rolls-Royce plc Turbofan Engines
Applicability*9
This AD applies to all Rolls-Royce plc (RR) RB211-524G2-19; RB211-524G2-T-19; RB211-524G3-19; RB211-524G3-T-19; RB211-524H2-19; RB211-524H2-T-19; RB211-524H-36; RB211-524H-T-36; RB211-535E4-37; RB211-535E4-B-37; RB211-535E4-B-75; and RB211-535E4-C-37 turbofan engines with intermediate-pressure (IP) discs listed in Appendix 1 and Appendix 2 of RR Alert Service Bulletin (ASB) No. RB.211-72-AG493, Revision 2, dated October 12, 2012.
Compliance
After the effective date of this AD, use Appendix 1 and Appendix 2 of RR ASB No. RB.211-72-AG493, Revision 2, dated October 12, 2012, to determine if the IP turbine disc is below or above the inspection threshold. (1) If below the inspection threshold, clean and perform a Superconductive Quantitative Inductive Device (SQUID) inspection of the disc at the next shop visit or before the disc reaches the inspection threshold, whichever is later. Use Appendix 4 of RR ASB No. RB.211-72-AG493, Revision 2, dated October 12, 2012, to perform the SQUID inspection. (2) If above the inspection threshold, clean and perform a SQUID inspection of the disc if in the shop or, at the next shop visit, whichever occurs first. Use Appendix 4 of RR ASB No. RB.211-72-AG493, Revision 2, dated October 12, 2012, to perform the SQUID inspection. (3) Do not return to service any disc that fails the inspection required by this AD. (4) Instead of performing the inspection required by paragraph (f), you may replace an affected disc with a part eligible for installation. See Appendix 1 and Appendix 2 of RR ASB No. RB.211-72-AG493, Revision 2, dated October 12, 2012, to determine if you have an affected disc.
Required actions
(1) After the effective date of this AD, use Appendix 2 of RR ASB No. RB.211-72-AG493, Revision 2, dated October 12, 2012, to determine the maximum life (in cycles) of affected IP turbine disc(s). (2) Remove from service any disc at the next shop visit or before it exceeds its maximum life (in cycles), whichever is later, as found in Appendix 2 of RR ASB No. RB.211-72-AG493, Revision 2, dated October 12, 2012. (3) Do not return to service any disc that exceeds its maximum life (in cycles) as found in Appendix 2 of RR ASB No. RB.211-72-AG493, Revision 2, dated October 12, 2012, unless it has passed the inspection required by paragraph (f) of the AD.
Unsafe condition
Unless already done, do the following actions.
Affected ADs
None.
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