# Airworthiness Directives; Engine Alliance Turbofan Engines
> **Rule** · Final rule. · Published 2013-06-14 · Effective 2013-07-19 · 78 FR 35747
## Document
- **Document number:** 2013-14040
- **Category:** airworthiness
- **Manufacturer:** Engine Alliance Turbofan
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 78 FR 35747
- **Publication date:** 2013-06-14
- **Effective date:** 2013-07-19
- **FAA docket:** Docket No. FAA-2012-1329
## Abstract

We are adopting a new airworthiness directive (AD) for certain Engine Alliance GP7270 and GP7277 turbofan engines. This 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 AD requires initial and repetitive borescope inspections of the baffle plate feature and removal from service of the HPC stage 6 disk if the plate is missing material. This AD also requires mandatory removal from service of these HPC stage 6 disks at the next HPC module exposure. We are issuing this AD to prevent failure of the HPC stage 7-9 spool, uncontained engine failure, and damage to the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2013/06/14/2013-14040/airworthiness-directives-engine-alliance-turbofan-engines)
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