Airworthiness directives › 2020-06-16
AD 2020-06-16 Airworthiness Directives; Rolls-Royce, Deutschland Ltd. & Co. KG (Formerly Rolls-Royce plc) Turbofan Engines
Applicability*9
This AD applies to Rolls-Royce Deutschland Ltd. & Co. KG (formerly Rolls-Royce plc) RB211 Trent 768-60, 772-60, and 772B-60 turbofan engines, with low-pressure (LP) compressor blade, part number (P/N) FK23411, FK25441, FK25968, FW11901, FW15393, FW23643, FW23741, FW23744, KH23403, or KH23404, installed.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) Within the compliance time specified in Figure 1 to paragraph (g)(1) of this AD and thereafter, at intervals not to exceed 1,200 flight cycles (FCs) or Standard Duty Cycles (SDCs) for Non-Standard Operations (NSO), as applicable, since the last ultrasonic inspection (UI), perform a UI of each affected LP compressor blade in accordance with the Accomplishment Instructions, paragraph 3, of Rolls-Royce plc (RR) Alert Non-Modification Service Bulletin (NMSB) RB.211-72-AH465, Revision 6, dated November 29, 2019. Note 1 to paragraph (g)(1): Paragraph 1.D of RR Alert NMSB RB.211-72-AH465, Revision 6, dated November 29, 2019, describes how to determine the applicable SDCs. The Time Limits Manual (TLM), 05-00-01, defines NSO. ER31MR20.002 (2) If, during any inspection required by paragraph (g)(1) of this AD, a LP compressor blade is rejected by the UI, as defined in Accomplishment Instructions, paragraph 3, of RR Alert NMSB RB.211-72-AH465, Revision 6, dated November 29, 2019, before further flight, or before returning the LP compressor blade to service, whichever occurs first, remove the affected LP compressor blade from service and replace with a part eligible for installation.
Unsafe condition
This AD was prompted by LP compressor blade partial airfoil release events. While released sections were contained in each case, projection of secondary debris and effects could present a potential hazard. The FAA is issuing this AD to prevent LP compressor blade airfoil separation. The unsafe condition, if not addressed, could result in damage to the engine and damage to the airplane.
Affected ADs
This AD replaces AD 2017-03-02, Amendment 39-18793 (82 FR 10701, February 15, 2017).
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