Airworthiness Directive · Amendment 39-19551 · Turbine section
Engine Alliance Turbofan Engines
This AD applies to Engine Alliance (EA) GP7270, GP7272, and GP7277 turbofan engines, with a high-pressure turbine (HPT) stator case (HPT case), part number (P/N) 2060M40G02 or 2137M29G01 installed, and with HPT case serial numbers (S/Ns) listed in Planning Information, Table 1, of Engine Alliance Alert Service Bulletin EAGP7-A72-401, Revision 1, dated December 13, 2018, and in Planning Information, Table 1, of Engine Alliance Service Bulletin EAGP7-72-399, dated June 4, 2018.
We are superseding Airworthiness Directive (AD) 2018-22-05, which applied to Engine Alliance (EA) GP7270, GP7272, and GP7277 turbofan engines with a certain high-pressure turbine (HPT) case installed. AD 2018-22-05 required removal of affected HPT stator cases (HPT cases) from service and their replacement with a part eligible for installation. This AD retains these requirements, reduces the compliance times for the removal and replacement of certain HPT cases, and identifies additional affected parts that must be removed and replaced. This AD was prompted by the discovery of a quality escape at a manufacturing facility involving unapproved welds on HPT cases. Subsequent additional findings suggested the need for an updated risk analysis, resulting in reduced compliance times for those parts and the identification of additional affected parts. We are issuing this AD to address the unsafe condition on these products.
(1) For HPT cases listed in Planning Information, Table 1, of Engine Alliance Alert Service Bulletin EAGP7-A72-401, Revision No. 1, dated December 13, 2018, remove the affected HPT case from service within the cycles identified in Table 1 of Engine Alliance Alert Service Bulletin EAGP7-A72-401, Revision No. 1, dated December 13, 2018, after the effective date of this AD.
(2) For HPT cases listed in Planning Information, Table 1, of Engine Alliance Service Bulletin EAGP7-72-399, dated June 4, 2018, remove the affected HPT cases from service, using the number of part cycles since new (PCSN) or part cycles since overhaul (PCSO), whichever is less, as specified in Table 1 to paragraph (g)(2) of this AD.
(3) Replace the removed HPT case with a part eligible for installation before further flight.
For the purpose of this AD, a “part eligible for installation” is any HPT case not identified in paragraph (c) of this AD or an HPT case listed in this AD that has been inspected and repaired by a method approved by the Manager, ECO Branch, FAA.
