airworthiness · Rule · Final rule; request for comments. · Published 2019-08-15 · Effective 2019-08-30 · 84 FR 41632
Document
Document number
2019-17499
Federal Register citation
84 FR 41632
Type
Rule
Action
Final rule; request for comments.
Category
airworthiness
Manufacturer
Engine Alliance Turbofan
Publication date
2019-08-15
Effective date
2019-08-30
FAA docket
Docket No. FAA-2019-0459
Abstract
The FAA is superseding Airworthiness Directive (AD) 2018-22-07 for all Engine Alliance (EA) GP7270, GP7272, and GP7277 model turbofan engines. AD 2018-22-07 required inspection of the stage 6 seal ring for correct installation and inspection of the high-pressure compressor (HPC) stages 2-5 spool for cracks and, depending on the results of the inspections, replacement of the HPC stages 2-5 spool with a part eligible for installation. This AD requires the same inspections but reduces the inspection interval and adds a repetitive inspection and a mandatory terminating action. 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. The FAA is issuing this AD to address the unsafe condition on these products.