# Proposed AD FAA-2015-3585: Engine Alliance Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2015-28-01
- Products: Engine Alliance
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: October 1, 2015, 80 FR 59081
- Comments due: November 30, 2015
- Became: [AD 2015-28-01](https://openairdocs.org/ad/2015-28-01)
- Docket: FAA-2015-3585 (https://www.regulations.gov/docket/FAA-2015-3585, where comments are filed)
- Project: 2015-NE-22-AD
- FR document: 2015-24731
- Official PDF: https://openairdocs.org/files/sha256/d1/f6/d1f691e0230317ccf7ec93199b881c801fc27a22fd70cb6df8d6f55b7230f0f0 (from https://www.govinfo.gov/content/pkg/FR-2015-10-01/pdf/2015-24731.pdf)
- Federal Register: https://www.federalregister.gov/documents/2015/10/01/2015-24731/airworthiness-directives-engine-alliance-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/83D381C5B695705286257ED1004F086B.0001
- Page: https://openairdocs.org/proposed/FAA-2015-3585

## Summary

We propose to adopt a new airworthiness directive (AD) for certain Engine Alliance (EA) GP7270 turbofan engines. This proposed AD was prompted by the manufacturer informing us that the inspection and repair criteria in the maintenance manual for aft bolt holes of the high-pressure compressor (HPC) cone shaft on the affected engines is incorrect. This proposed AD would require inspection of the HPC cone shaft and repair of affected parts, if needed. We are proposing this AD to prevent failure of the HPC cone shaft, which could lead to uncontained engine failure and damage to the airplane.

## Notices in this docket

- Oct 1, 2015: Notice of proposed rulemaking (NPRM). (first notice), FR document 2015-24731, comments due Nov 30, 2015 (https://www.federalregister.gov/documents/2015/10/01/2015-24731/airworthiness-directives-engine-alliance-turbofan-engines)

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