airworthiness · Rule · Final rule; request for comments. · Published 2019-09-24 · Effective 2019-10-09 · 84 FR 49944
Document
Document number
2019-20599
Federal Register citation
84 FR 49944
Type
Rule
Action
Final rule; request for comments.
Category
airworthiness
Manufacturer
Engine Alliance Turbofan
Publication date
2019-09-24
Effective date
2019-10-09
FAA docket
Docket No. FAA-2019-0692
Abstract
The FAA is superseding Airworthiness Directive (AD) 2019-16-04 for all Engine Alliance (EA) GP7270 and GP7277 model turbofan engines. AD 2019-16-04 required a visual inspection of the 1st-stage low- pressure compressor (LPC) rotor assembly, referred to after this as the "engine fan hub assembly," for damage, a one-time eddy current inspection (ECI) of the engine fan hub blade slot bottom and blade slot front edge for cracks; and removal of parts if damage or defects are found. AD 2019-16-04 also required replacement of the engine fan hub blade lock assembly for certain GP7270 and GP7277 model turbofan engines. This AD, for certain GP7270 and GP7277 model turbofan engines, reduces the compliance time for the initial ECI and requires repetitive ECIs of the engine fan hub blade slot bottom and blade slot front edge for cracks. This AD also retains the visual inspection requirements of the engine fan hub assembly for all GP7270 and GP7277 model turbofan engines. This AD was prompted by an uncontained failure of the engine fan hub. The FAA is issuing this AD to address the unsafe condition on these products.