# Airworthiness Directives; General Electric Company CF6-6 Series Turbofan Engines
> **Rule** · Final rule. · Published 1998-08-31 · Effective 1998-09-30 · 63 FR 46164
## Document
- **Document number:** 98-23362
- **Category:** airworthiness
- **Manufacturer:** General Electric Company CF6-6 Series Turbofan
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 63 FR 46164
- **Publication date:** 1998-08-31
- **Effective date:** 1998-09-30
- **FAA docket:** Docket No. 98-ANE-18-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to General Electric Company (GE) CF6-6 series turbofan engines, that requires removal from service of affected low pressure turbine (LPT) stage 4 disks prior to reaching new, reduced cyclic life limits, and replacement with serviceable parts. This amendment is prompted by reports of LPT stage 4 disk cracking in the blade dovetail slot bottom area. The actions specified by this AD are intended to prevent LPT stage 4 disk cracking, which could result in an uncontained engine failure and damage to the aircraft.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1998/08/31/98-23362/airworthiness-directives-general-electric-company-cf6-6-series-turbofan-engines)
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