airworthiness · Rule · Final rule; request for comments. · Published 2018-12-27 · Effective 2019-01-11 · 83 FR 66609
Document
Document number
2018-27926
Federal Register citation
83 FR 66609
Type
Rule
Action
Final rule; request for comments.
Category
airworthiness
Manufacturer
Engine Alliance Turbofan
Publication date
2018-12-27
Effective date
2019-01-11
FAA docket
Docket No. FAA-2018-0938
Abstract
We are adopting a new airworthiness directive (AD) for all Engine Alliance (EA) GP7270, GP7272, and GP7277 model turbofan engines. This AD requires inspection of the stage 6 seal ring for correct installation and inspection of the high-pressure compressor (HPC) stages 2-5 spool for cracks. This AD also requires replacement of the HPC stages 2-5 spool if the stage 6 seal ring is incorrectly installed or if the HPC stages 2-5 spool is found cracked. This AD was prompted by a shop finding of axial cracks in the interstage 5-6 seal teeth of the HPC stages 2-5 spool spacer arm, due to an incorrectly installed stage 6 seal ring. We are issuing this AD to address the unsafe condition on these products.