# Airworthiness Directives; General Electric Company (GE) GE90-110B1 and GE90-115B Turbofan Engines
> **Rule** · Final rule. · Published 2011-12-30 · Effective 2012-02-03 · 76 FR 82103
## Document
- **Document number:** 2011-32832
- **Category:** airworthiness
- **Manufacturer:** General Electric Company (GE) GE90-110B1 and GE90-115B Turbofan
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 76 FR 82103
- **Publication date:** 2011-12-30
- **Effective date:** 2012-02-03
- **FAA docket:** Docket No. FAA-2011-0278
## Abstract

We are adopting a new airworthiness directive (AD) for the products listed above, with certain part number (P/N) high-pressure compressor (HPC) stages 2-5 spools installed. This AD was prompted by an aborted takeoff caused by liberation of small pieces from the HPC stages 1-2 seal teeth and two shop findings of cracks in the seal teeth. This AD requires eddy current inspection (ECI) or spot fluorescent penetrant inspection (FPI) of the stages 1-2 seal teeth of the HPC stages 2-5 spool for cracks. This AD only allows installation of either HPC stator stage 1 interstage seals that are pregrooved or previously worn seals with acceptable wear marks to prevent heavy rubs. We are issuing this AD to detect cracks in the HPC stages 1-2 seal teeth due to heavy rubs that could result in failure of the seal of the HPC stages 2-5 spool, uncontained engine failure, and damage to the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2011/12/30/2011-32832/airworthiness-directives-general-electric-company-ge-ge90-110b1-and-ge90-115b-turbofan-engines)
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