Airworthiness Directive · Amendment 39-22042 · Turbine engine compressor section
Engine Alliance Turbofan Engines
This AD applies to Engine Alliance (EA) GP7270, GP7272, and GP7277 model turbofan engines with an installed:
(1) Stages 7-9 compressor rotor spool, part number (P/N) 2031M90G05, having serial number (S/N) GWN0R7R3; or
(2) Stages 7-9 compressor rotor spool, P/N 2031M90G07, having S/N GWN0R9R3, GWN0R9TC, GWN0R9TM, GWN0RCT5, or GWN0RCT6.
The FAA is adopting a new airworthiness directive (AD) for certain Engine Alliance (EA) GP7270, GP7272, and GP7277 model turbofan engines. This AD was prompted by a manufacturer investigation that revealed certain stages 7-9 compressor rotor spools were manufactured from a billet of material suspected of having foreign material embedded. This AD requires the replacement of the affected stages 7-9 compressor rotor spool. The FAA is issuing this AD to address the unsafe condition on these products.
Within 500 flight cycles (FCs) after the effective date of this AD, remove the affected stages 7-9 compressor rotor spool from service and replace with a part eligible for installation.
For the purpose of this AD, a “part eligible for installation” is any stages 7-9 compressor rotor spool with an S/N that is not identified in paragraph (c)(1) or (2) of this AD.
