# Proposed AD FAA-2015-3713: Engine Alliance Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2016-05-07
- Products: Engine Alliance
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: October 23, 2015, 80 FR 64373
- Comments due: December 22, 2015
- Became: [AD 2016-05-07](https://openairdocs.org/ad/2016-05-07)
- Docket: FAA-2015-3713 (https://www.regulations.gov/docket/FAA-2015-3713, where comments are filed)
- Project: 2015-NE-23-AD
- FR document: 2015-26755
- Official PDF: https://openairdocs.org/files/sha256/cd/52/cd52fe09c4614849bdc767f1d8e4d7259e528fc5de5936e339b0d3c910cc57a0 (from https://www.govinfo.gov/content/pkg/FR-2015-10-23/pdf/2015-26755.pdf)
- Federal Register: https://www.federalregister.gov/documents/2015/10/23/2015-26755/airworthiness-directives-engine-alliance-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/453A3782344BD33686257EE7004F15D0.0001
- Page: https://openairdocs.org/proposed/FAA-2015-3713

## Summary

We propose to adopt a new airworthiness directive (AD) for certain Engine Alliance (EA) GP7270 turbofan engines. This proposed AD was prompted by reports of the installation of non-conforming honeycomb seals in the high-pressure compressor (HPC) adjacent to the HPC rotor stage 2 to 5 spool and stage 7 to 9 spool. This proposed AD would require removal and replacement of the affected HPC rotor stage 2 to 5 and stage 7 to 9 spools. We are proposing this AD to prevent failure of the HPC rotor stage 2 to 5 and stage 7 to 9 spools, which could lead to uncontained engine failure and damage to the airplane.

## Notices in this docket

- Oct 23, 2015: Notice of proposed rulemaking (NPRM). (first notice), FR document 2015-26755, comments due Dec 22, 2015 (https://www.federalregister.gov/documents/2015/10/23/2015-26755/airworthiness-directives-engine-alliance-turbofan-engines)

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