Airworthiness directives › 2020-05-01
AD 2020-05-01 Airworthiness Directives; Rolls-Royce Deutschland Ltd & Co KG (Type Certificate Previously Held by Rolls-Royce plc) Turbofan Engines
Applicability*9
This AD applies to all Rolls-Royce Deutschland Ltd. & Co KG (RRD) (Type Certificate Previously Held by Rolls-Royce plc) Trent 1000-AE3, Trent 1000-CE3, Trent 1000-D3, Trent 1000-G3, Trent 1000-H3, Trent 1000-J3, Trent 1000-K3, Trent 1000-L3, Trent 1000-M3, Trent 1000-N3, Trent 1000-P3, Trent 1000-Q3, and Trent 1000-R3 model turbofan engines.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) Before exceeding the compliance time specified in Table 1 to paragraph (g)(1) of this AD, and thereafter at intervals not to exceed 50 HPT blade flight cycles (FCs) since the last inspection, perform an on-wing borescope inspection (BSI) of the HPT blades, part number (P/N) KH10575 (pre-mod/SB 72-J550), or P/N KH64485 (post-mod/SB 72-J550), for cracks. (i) Use Accomplishment Instructions, paragraph 3.C., of RR Alert NMSB Trent 1000 72-AK316, Revision 3, dated July 16, 2019, to perform the BSI. (ii) [Reserved] ER10MR20.017 (2) Within 10 engine FCs after in-flight shutdown (IFSD) of an engine, perform an on-wing BSI of the HPT blades, P/N KH10575 (pre-mod/SB 72-J550), or P/N KH64485 (post-mod/SB 72-J550), for cracks on the not-affected (no IFSD) engine installed on that airplane. (i) Use Accomplishment Instructions, paragraph 3.C., of RR Alert NMSB Trent 1000 72-AK316, Revision 3, dated July 16, 2019. (ii) [Reserved] (3) Remove the full set of HPT blades if any individual HPT blade is found cracked during the on-wing BSI required by paragraph (g)(1) or (2) and replace with a full HPT blade set eligible for installation within the compliance time specified in Table 2 to paragraph (g)(3) of this AD. ER10MR20.018 (4) Remove the full set of HPT blades, P/N KH10575 (pre-mod/SB 72-J550), or P/N KH64485 (post-mod/SB 72-J550), after the effective date of this AD, as follows. (i) Before accumulating 1,000 HPT blade FCs on any engine, or (ii) Before both engines installed on the airplane accumulate a combined total of 1,400 HPT blade FCs.
Unsafe condition
This AD was prompted by the manufacturer identifying that the high-pressure turbine (HPT) blades may fail prematurely. The FAA is issuing this AD to prevent failure of the HPT blades. The unsafe condition, if not addressed, could result in failure of one or more engines, loss of thrust control, and loss of the airplane.
Affected ADs
None.
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