Airworthiness Directive · Amendment 39-19478 · Turbine section
Engine Alliance Turbofan Engines
Superseded. A later AD replaced this one: AD 2019-02-04. Comply with the one in force.
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 EA Alert Service Bulletin (ASB) EAGP7-A72-401, dated August 23, 2018, and in Planning Information, Table 1, of EA Service Bulletin (SB) EAGP7-72-399, dated June 4, 2018.
We are adopting a new airworthiness directive (AD) for all Engine Alliance (EA) GP7270, GP7272, and GP7277 turbofan engines with a certain high-pressure turbine (HPT) case installed. This AD requires removal of affected HPT stator cases (HPT cases) from service and their replacement with a part eligible for installation. This AD was prompted by the discovery of a quality escape at a manufacturing facility involving unapproved welds on HPT cases. We are issuing this AD to address the unsafe condition on these products.
(1) For HPT cases listed in Planning Information, Table 1, of EA ASB EAGP7-A72-401, dated August 23, 2018, remove the affected HPT case from service within the cycles identified in Table 1 of EA SB EAGP7-A72-401 after the effective date of this AD.
(2) For HPT cases listed in Planning Information, Table 1, of 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.
| PCSN or PCSO | Remove from service within these cycles after the effective date of this AD |
|---|---|
| Less than 1000 | 150 cycles. |
| 1001 to 2000 | 125 cycles. |
| 2001 to 3000 | 100 cycles. |
| 3001 to 4000 | 75 cycles. |
| 4001 to 5000 | 50 cycles. |
| 5001 or more | 25 cycles. |
(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.
