# Proposed AD FAA-2012-1329: Engine Alliance Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2013-12-02
- Products: Engine Alliance
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: February 7, 2013, 78 FR 9003
- Comments due: April 8, 2013
- Became: [AD 2013-12-02](https://openairdocs.org/ad/2013-12-02)
- Docket: FAA-2012-1329 (https://www.regulations.gov/docket/FAA-2012-1329, where comments are filed)
- Project: 2012-NE-46-AD
- FR document: 2013-02721
- Official PDF: https://openairdocs.org/files/sha256/08/aa/08aacee05e1a0ccee4d6ce5b246628303790da2cade522113e43e301be4fed0a (from https://www.govinfo.gov/content/pkg/FR-2013-02-07/pdf/2013-02721.pdf)
- Federal Register: https://www.federalregister.gov/documents/2013/02/07/2013-02721/airworthiness-directives-engine-alliance-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/61D8CD1E3F310ABF86257B0B0050848F.0001
- Page: https://openairdocs.org/proposed/FAA-2012-1329

## Summary

We propose to adopt a new airworthiness directive (AD) for certain Engine Alliance GP7270 and GP7277 turbofan engines. This proposed AD was prompted by damage to the high-pressure compressor (HPC) stage 7-9 spool caused by failure of the baffle plate feature on affected HPC stage 6 disks. This proposed AD would require initial and repetitive borescope inspections of the baffle plate feature and removal from service of the HPC stage 6 disk before further flight, if the plate is missing material. This proposed AD would also require mandatory removal from service of these HPC stage 6 disks at the next HPC module exposure. We are proposing this AD to prevent uncontained failure of the HPC stage 7-9 spool, uncontained engine failure, and damage to the airplane.

## Notices in this docket

- Feb 7, 2013: Notice of proposed rulemaking (NPRM). (first notice), FR document 2013-02721, comments due Apr 8, 2013 (https://www.federalregister.gov/documents/2013/02/07/2013-02721/airworthiness-directives-engine-alliance-turbofan-engines)

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