Airworthiness Directive · Amendment 39-18425 · Engine Alliance Turbofan Engines
Engine Alliance Turbofan Engines
This AD applies to Engine Alliance (EA) GP7270 turbofan engines with one or both of the following installed:
(1) A high-pressure compressor (HPC) rotor stage 2 to 5 spool, part number (P/N) 382-104-807-0, with a serial number (S/N) listed in EA Service Bulletin (SB) EAGP7-72-327, dated July 21, 2015; or
(2) An HPC rotor stage 7 to 9 spool, P/N 2031M90G04, 2031M90G05, or 2031M90G07, with an S/N listed in EA SB EAGP7-72-328, dated July 21, 2015.
We are adopting a new airworthiness directive (AD) for certain Engine Alliance (EA) GP7270 turbofan engines. This AD was prompted by reports of the installation of non-conforming honeycomb cartridges in the high-pressure compressor (HPC) adjacent to the HPC rotor stage 2 to 5 spool and stage 7 to 9 spool. This AD requires removal and replacement of the affected HPC rotor stage 2 to 5 and stage 7 to 9 spools and adjacent honeycomb cartridges. We are issuing this AD to prevent failure of the HPC rotor stage 2 to 5 and stage 7 to 9 spools, which could lead to uncontained engine failure and damage to the airplane.
(1) For engines with an HPC rotor stage 2 to 5 spool, P/N 382-104-807-0, installed with an S/N listed in EA SB EAGP7-72-327, dated July 21, 2015, do the following:
(i) Remove from service the HPC rotor stage 2 to 5 spool and replace with a part eligible for installation.
(ii) Remove from service the honeycomb cartridges on the HPC stage 5 vanes and replace with parts eligible for installation.
(2) For engines with an HPC rotor stage 7 to 9 spool, P/N 2031M90G04, 2031M90G05, or 2031M90G07 installed with an S/N listed in EA SB EAGP7-72-328, dated July 21, 2015, do the following:
(i) Remove from service the HPC rotor stage 7 to 9 spool and replace with a part eligible for installation.
(ii) Remove from service the honeycomb cartridges on the HPC stage 6, stage 7, and stage 8 vanes and replace with parts eligible for installation.
