Airworthiness directives › 2018-15-01
AD 2018-15-01 Airworthiness Directives; Rolls-Royce plc Turbofan Engines
Applicability*9
This AD applies to Rolls-Royce plc (RR) Trent 1000-A, Trent 1000-C, Trent 1000-D, Trent 1000-E, Trent 1000-G, Trent 1000-H, Trent 1000-A2, Trent 1000-C2, Trent 1000-D2, Trent 1000-E2, Trent 1000-G2, Trent 1000-H2, Trent 1000-J2, Trent 1000-K2, and Trent 1000-L2 engine models with engine serial numbers identified in Appendix 1, Table 1, of RR Alert Non-Modification Service Bulletin (NMSB) TRENT 1000 72-AJ992, Revision 1, dated January 3, 2018, or Appendix 1, Table 1, of RR Alert NMSB TRENT 1000 72-AJ992, Revision 2, dated April 16, 2018, except those that have incorporated RR Service Bulletin (SB) Trent 1000 72-H818, dated November 14, 2016.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
After the effective date of this AD, for any affected engine identified in Appendix 1, Table 1, of RR Alert NMSB TRENT 1000 72-AJ992, Revision 1, dated January 3, 2018; or Appendix 1, Table 1, of RR Alert NMSB TRENT 1000 72-AJ992, Revision 2, dated April 16, 2018, installed with another affected engine, listed in the same table, on the same airplane, remove one of the engines from the airplane before both engines exceed their respective IPT blade cyclic life limit identified in Appendix 1, Table 1, of the respective NMSB, or within 20 flight cycles, whichever occurs later.
Unsafe condition
This AD was prompted by operating restrictions that have been defined for certain engines with intermediate-pressure turbine (IPT) blades susceptible to shank corrosion and possible blade separation. These restrictions define when an engine can no longer be installed on an airplane together with other engines susceptible to the same failure. We are issuing this AD to prevent the simultaneous failure of both engines. This unsafe condition, if not addressed, could result in a dual engine in-flight shutdown and loss of the airplane.
Affected ADs
None.
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