Airworthiness Directive · Amendment 39-23485 · Turbine section
Engine Alliance Engines
This AD applies to Engine Alliance (EA) Model GP7270, GP7272, and GP7277 engines, certificated in any category, having a high-pressure turbine (HPT) interstage seal serial number (S/N) specified in Appendix-A of EA Alert Service Bulletin EAGP7-A72-479, dated September 4, 2026 (EA ASB EAGP7-A72-479).
The FAA is adopting a new airworthiness directive (AD) for certain Engine Alliance (EA) Model GP7270, GP7272, and GP7277 engines. This AD was prompted by a report of an aborted takeoff that resulted from an uncontained failure of the high-pressure turbine (HPT) interstage seal. This AD requires removal from service and replacement of the HPT interstage seal with a part eligible for installation. The FAA is issuing this AD to address the unsafe condition on these products.
(1) An “affected part” is an HPT interstage seal having part number (P/N) 2047M99P02 and S/N listed in Appendix-A of EA ASB EAGP7-A72-479.
(2) A “part eligible for installation” is any HPT interstage seal that is not an affected part.
At the applicable times specified in paragraphs (h)(1), (2), and (3) of this AD, as applicable, remove the HPT interstage seal from service and replace with a part eligible for installation.
(1) For HPT interstage seals specified in Table 1 of Appendix-A of EA ASB EAGP7-A72-479, within 50 flight cycles or within 30 days, whichever occurs first after the effective date of this AD.
(2) For HPT interstage seals specified in Table 2 of Appendix-A of EA ASB EAGP7-A72-479, within 100 flight cycles or within 60 days, whichever occurs first after the effective date of this AD.
(3) For HPT interstage seals specified in Table 3 of Appendix-A of EA ASB EAGP7-A72-479, within 150 flight cycles or within 90 days, whichever occurs first after the effective date of this AD.
Although EA ASB EAGP7-A72-479 specifies to submit certain information to the manufacturer, this AD does not require that action.
