Airworthiness directives › 2020-14-04
AD 2020-14-04 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-A, Trent 1000-AE, Trent 1000-C, Trent 1000-CE, Trent 1000-D, Trent 1000-E, Trent 1000-G, and Trent 1000-H model turbofan engines.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Within 30 days after the effective date of this AD, remove and replace one or both affected engines identified as “Not Acceptable De-pair required” in paragraph 3, Accomplishment Instructions, Table 2, “Examples of compliant and non-compliant engine pairing combinations,” of Rolls-Royce plc (RR) Alert Non-Modification Service Bulletin (NMSB) Trent 1000 72-AK468, Revision 1, dated March 3, 2020.
Unsafe condition
This AD was prompted by occurrences of in-service engine surges on affected RRD Trent model turbofan engines with a high number of intermediate pressure compressor (IPC) module flight hours since new or cycles since new. Investigation by the manufacturer shows reduced surge margin caused by IPC deterioration has led to in-service engine surges. The FAA is issuing this AD to reduce the risk of a dual-engine surge event. 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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