# Airworthiness Directives; General Electric Company GE90-110B1, GE90-113B, and GE90-115B Series Turbofan Engines
> **Rule** · Final rule. · Published 2009-12-14 · Effective 2010-01-19 · 74 FR 66042
## Document
- **Document number:** E9-29428
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 74 FR 66042
- **Publication date:** 2009-12-14
- **Effective date:** 2010-01-19
- **FAA docket:** Docket No. FAA-2009-0143
## Abstract

The FAA is adopting a new airworthiness directive (AD) for General Electric Company (GE) GE90-110B1, GE90-113B, and GE90-115B series turbofan engines with stage 6 low-pressure turbine (LPT) blades, part number (P/N) 1765M37P03 or P/N 1765M37P04, installed. This AD requires initial and repetitive inspections for shroud interlock wear of the stage 6 LPT blades. This AD also requires replacing those blades with stage 6 LPT blades eligible for installation at the next engine shop visit as terminating action to the repetitive blade inspections. This AD results from eight reports of GE90-115B stage 6 LPT single-blade separation events. We are issuing this AD to prevent failure of stage 6 LPT blades, which could result in uncontained engine failure and damage to the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2009/12/14/E9-29428/airworthiness-directives-general-electric-company-ge90-110b1-ge90-113b-and-ge90-115b-series-turbofan)
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