Airworthiness directives › 2021-08-01
AD 2021-08-01 Airworthiness Directives; Rolls-Royce Deutschland Ltd & Co KG (Type Certificate Previously Held by Rolls-Royce plc) Turbofan Engines
Applicability*9
This AD applies to Rolls-Royce Deutschland Ltd & Co KG (Type Certificate previously held by Rolls-Royce plc) RB211 Trent 768-60, RB211 Trent 772-60, and RB211 Trent 772B-60 model turbofan engines equipped with: (1) Low-pressure compressor (LPC) blade, with part number (P/N) FW23741 or P/N KH23403, and a serial number (S/N) listed in Appendix 1 of Rolls-Royce (RR) Trent 700 Series Propulsion Systems Alert Non-Modification Service Bulletin (NMSB) RB.211-72-AK492, Revision 1, dated November 30, 2020 (NMSB RB.211-72-AK492), installed; or (2) LPC disk, with P/N FK22541, P/N FW16259 or P/N KH20338, and an S/N listed in Appendix 2 of NMSB RB.211-72-AK492.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) Within 200 engine flight cycles (FCs) after the effective date of this AD, perform an initial on-wing ultrasonic inspection of the blade root of each LPC blade using the Accomplishment Instructions, paragraph 3.A.(3)(a) through (c) of NMSB RB.211-72-AK492. (2) Within 200 engine FCs after the effective date of this AD, re-lubricate each LPC blade and LPC disk using the Accomplishment Instructions, paragraph 3.A.(4) of NMSB RB.211-72-AK492. (3) Repeat the inspection of each LPC blade and the re-lubrication of each LPC blade and LPC disk required by paragraphs (g)(1) and (2) of this AD at intervals not to exceed 350 engine FCs since the last inspection and re-lubrication. (4) If, during any inspection required by paragraph (g)(1) or (3) of this AD, an LPC blade is found with unacceptable indications as specified in Appendix 4, paragraph 3 of NMSB RB.211-72-AK492, before next flight, remove and replace the LPC blade with a part eligible for installation.
Unsafe condition
This AD was prompted by maintenance that resulted in damage to certain LPC blades, resulting in increased susceptibility to cracking in the blade root. The FAA is issuing this AD to prevent failure of the LPC blade and the LPC disk. The unsafe condition, if not addressed, could result in engine in-flight shut-down and reduced control of the airplane.
Affected ADs
None.
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