# Proposed AD 98-ANE-18-AD: General Electric Company CF6-6 Series Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 98-18-10
- Action: Notice of proposed rulemaking (NPRM).
- Published: May 15, 1998, 63 FR 27001
- Comments due: June 15, 1998
- Became: [AD 98-18-10](https://openairdocs.org/ad/98-18-10)
- Docket: 98-ANE-18-AD
- FR document: 98-12915
- Official PDF: https://openairdocs.org/files/sha256/8b/f1/8bf18967ca7e2239641b09a2a99664b1cad34ec0306ee2979e7276461d8b6e98 (from https://www.govinfo.gov/content/pkg/FR-1998-05-15/pdf/98-12915.pdf)
- Federal Register: https://www.federalregister.gov/documents/1998/05/15/98-12915/airworthiness-directives-general-electric-company-cf6-6-series-turbofan-engines
- Page: https://openairdocs.org/proposed/98-ANE-18-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to General Electric Company (GE) CF6- 6 series turbofan engines. This proposal would require 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 proposal is prompted by reports of LPT stage 4 disk cracking in the blade dovetail slot bottom area. The actions specified by the proposed AD are intended to prevent LPT stage 4 disk cracking, which could result in an uncontained engine failure and damage to the aircraft.

## Notices in this docket

- May 15, 1998: Notice of proposed rulemaking (NPRM). (first notice), FR document 98-12915, comments due Jun 15, 1998 (https://www.federalregister.gov/documents/1998/05/15/98-12915/airworthiness-directives-general-electric-company-cf6-6-series-turbofan-engines)

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