# Proposed AD FAA-2007-27687: General Electric Company CF34-1A, -3A, -3A1, -3A2, -3B, and -3B1 Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2007-07-07
- Products: GE Aircraft Engines
- Product type: Engine
- Action: Supplemental Notice of proposed rulemaking (NPRM); reopening of comment period.
- Published: April 17, 2009, 74 FR 17799
- Comments due: June 16, 2009
- Became: [AD 2007-07-07](https://openairdocs.org/ad/2007-07-07)
- Docket: FAA-2007-27687 (https://www.regulations.gov/docket/FAA-2007-27687, where comments are filed)
- Project: 2000-NE-42-AD
- FR document: E9-8787
- Official PDF: https://openairdocs.org/files/sha256/86/19/86195560604049aa80bf60917f4ed1bdf8e4fff361818e717f0e407d4826ef0d (from https://www.govinfo.gov/content/pkg/FR-2009-04-17/pdf/E9-8787.pdf)
- Federal Register: https://www.federalregister.gov/documents/2009/04/17/E9-8787/airworthiness-directives-general-electric-company-cf34-1a--3a--3a1--3a2--3b-and--3b1-turbofan
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/9A4E9A2E07F84A018625759B0046D6F4.0001
- Page: https://openairdocs.org/proposed/FAA-2007-27687

## Summary

This notice revises an earlier proposed airworthiness directive (AD), and supersedes an existing AD applicable to General Electric Company (GE) CF34-1A, -3A, -3A1, -3A2, -3B, and -3B1 turbofan engines. This proposed AD reopens the comment period, since we added additional requirements based on responses we received. This proposed AD would now require:

Inspecting certain fan disks for electrical arc-out indications,

Removing from service fan disks with electrical arc-out indications,

Performing tactile and enhanced visual (TEV) inspections, fluorescent penetrant inspections (FPI), and eddy current inspections (ECI) on certain disks that have already had a shop-level inspection, and

Repetitive FPI and ECI on certain fan disks.

This proposed AD results from an updated risk analysis by GE that shows we need to take corrective action that is more stringent. We are proposing this AD to prevent an uncontained failure of the fan disk, which could result in damage to the airplane.

## Notices in this docket

- Jan 18, 2008: Notice of proposed rulemaking (NPRM). (first notice), FR document E8-821, comments due Mar 18, 2008 (https://www.federalregister.gov/documents/2008/01/18/E8-821/airworthiness-directives-general-electric-company-cf34-1a--3a--3a1--3a2--3b-and--3b1-turbofan)
- Apr 17, 2009: Supplemental Notice of proposed rulemaking (NPRM); reopening of comment period., FR document E9-8787, comments due Jun 16, 2009 (https://www.federalregister.gov/documents/2009/04/17/E9-8787/airworthiness-directives-general-electric-company-cf34-1a--3a--3a1--3a2--3b-and--3b1-turbofan)

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