# Airworthiness Directives; General Electric Company CF6-45 and CF6-50 Series Turbofan Engines
> **Rule** · Final rule; request for comments. · Published 2010-03-17 · Effective 2010-04-01 · 75 FR 12661
## Document
- **Document number:** 2010-5777
- **Category:** airworthiness
- **Manufacturer:** General Electric Company CF6-45 and CF6-50 Series Turbofan
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 75 FR 12661
- **Publication date:** 2010-03-17
- **Effective date:** 2010-04-01
- **FAA docket:** Docket No. FAA-2010-0068
## Abstract

The FAA is adopting a new airworthiness directive (AD) for General Electric Company (GE) CF6-45 and CF6-50 series turbofan engines with certain low-pressure turbine (LPT) stage 3 disks installed. This AD requires fluorescent penetrant inspection (FPI) of the LPT stage 3 disk under certain conditions and removal of the disk from service before further flight if found cracked. This AD also requires initial and repetitive borescope inspections of the high-pressure turbine (HPT) rotor stage 1 and stage 2 blades for wear and damage, including excessive airfoil material loss. This AD results from three reports of uncontained failures of LPT stage 3 disks and eight reports of cracked LPT stage 3 disks found during shop visit inspections. We are issuing this AD to prevent critical life-limited rotating engine part failure, which could result in an uncontained engine failure and damage to the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2010/03/17/2010-5777/airworthiness-directives-general-electric-company-cf6-45-and-cf6-50-series-turbofan-engines)
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