# Airworthiness Directives; Engine Alliance Turbofan Engines
> **Rule** · Final rule; request for comments. · Published 2018-12-27 · Effective 2019-01-11 · 83 FR 66609
## Document
- **Document number:** 2018-27926
- **Category:** airworthiness
- **Manufacturer:** Engine Alliance Turbofan
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 83 FR 66609
- **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.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2018/12/27/2018-27926/airworthiness-directives-engine-alliance-turbofan-engines)
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