# Proposed AD 99-NE-49-AD: General Electric Company CF34 Series Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2000-03-03
- Products: General Electric
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: October 5, 2001, 66 FR 50891
- Comments due: December 4, 2001
- Became: [AD 2000-03-03](https://openairdocs.org/ad/2000-03-03)
- Docket: 99-NE-49-AD
- FR document: 01-25054
- Official PDF: https://openairdocs.org/files/sha256/cb/2b/cb2bfeeaaeb3f44e54a6b999fa34438f94bff356a774eb76a4481f39986fb33b (from https://www.govinfo.gov/content/pkg/FR-2001-10-05/pdf/01-25054.pdf)
- Federal Register: https://www.federalregister.gov/documents/2001/10/05/01-25054/airworthiness-directives-general-electric-company-cf34-series-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/A3B60BB481C3861C86256AE0005F183E.0001
- Page: https://openairdocs.org/proposed/99-NE-49-AD

## Summary

The Federal Aviation Administration (FAA) proposes to supersede an existing airworthiness directive (AD), that is applicable to General Electric Company CF34 series turbofan engines. That AD currently requires revisions to the Engine Maintenance Program specified in the manufacturer's Instructions for Continued Airworthiness (ICA) for General Electric Company (GE) CF34 series turbofan engines. This proposal would modify the airworthiness limitations section of the manufacturer's manual and an air carrier's approved continuous airworthiness maintenance program to incorporate additional inspection requirements. An FAA study of in-service events involving uncontained failures of critical rotating engine parts has indicated the need for mandatory inspections. The mandatory inspections are needed to identify those critical rotating parts with conditions, which if allowed to continue in service, could result in uncontained failures. The actions specified by this proposed AD are intended to prevent critical life-limited rotating engine part failure, which could result in an uncontained engine failure and damage to the airplane.

## Notices in this docket

- Oct 7, 1999: Notice of proposed rulemaking (NPRM). (first notice), FR document 99-26208, comments due Dec 6, 1999 (https://www.federalregister.gov/documents/1999/10/07/99-26208/airworthiness-directives-general-electric-company-cf34-series-turbofan-engines)
- Aug 18, 2000: Notice of Proposed Rule Making; Revision., FR document 00-21054, comments due Sep 18, 2000 (https://www.federalregister.gov/documents/2000/08/18/00-21054/airworthiness-directives-general-electric-company-cf34-series-turbofan-engines)
- Oct 5, 2001: Notice of proposed rulemaking (NPRM)., FR document 01-25054, comments due Dec 4, 2001 (https://www.federalregister.gov/documents/2001/10/05/01-25054/airworthiness-directives-general-electric-company-cf34-series-turbofan-engines)

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