# Proposed AD 98-ANE-32-AD: General Electric Company CF6-45/50 Series Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2000-11-12
- Action: Notice of proposed rulemaking (NPRM).
- Published: October 26, 1999, 64 FR 57606
- Comments due: December 27, 1999
- Became: [AD 2000-11-12](https://openairdocs.org/ad/2000-11-12)
- Docket: 98-ANE-32-AD
- FR document: 99-27938
- Official PDF: https://openairdocs.org/files/sha256/50/d1/50d19231f657f6cb6cd7f8a69ef21b8832be9d4b1a20b175948de04f3c61bed8 (from https://www.govinfo.gov/content/pkg/FR-1999-10-26/pdf/99-27938.pdf)
- Federal Register: https://www.federalregister.gov/documents/1999/10/26/99-27938/airworthiness-directives-general-electric-company-cf6-4550-series-turbofan-engines
- Page: https://openairdocs.org/proposed/98-ANE-32-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to General Electric Company (GE) CF6- 45/50 series turbofan engines. This proposal would require initial and repetitive inspections for cracks in the stage 14 high pressure compressor (HPC) disk lock slots, and removal from service of certain disks, at the first piece-part level or HPC rotor module level exposure, after 6,000 cycles since new (CSN). This proposal is prompted by reports of stage 14 HPC disk lock slot cracks discovered during shop fluorescent penetrant inspections. The actions specified by the proposed AD are intended to prevent stage 14 HPC disk failure, which could result in an uncontained engine failure and damage to the aircraft.

## Notices in this docket

- Oct 26, 1999: Notice of proposed rulemaking (NPRM). (first notice), FR document 99-27938, comments due Dec 27, 1999 (https://www.federalregister.gov/documents/1999/10/26/99-27938/airworthiness-directives-general-electric-company-cf6-4550-series-turbofan-engines)

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