# Proposed AD FAA-2006-25738: General Electric Company (GE) CF6-80C2B Series Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2007-12-07
- Products: General Electric
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: November 14, 2011, 76 FR 70382
- Comments due: January 13, 2012
- Became: [AD 2007-12-07](https://openairdocs.org/ad/2007-12-07)
- Docket: FAA-2006-25738 (https://www.regulations.gov/docket/FAA-2006-25738, where comments are filed)
- Project: 2006-NE-27-AD
- FR document: 2011-29228
- Official PDF: https://openairdocs.org/files/sha256/b4/e0/b4e0b41dbd4eea763e7805550e12ed810a66d924bec0366f34c356a6803cccbe (from https://www.govinfo.gov/content/pkg/FR-2011-11-14/pdf/2011-29228.pdf)
- Federal Register: https://www.federalregister.gov/documents/2011/11/14/2011-29228/airworthiness-directives-general-electric-company-ge-cf6-80c2b-series-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/37B1A63FF1FD4B9B86257948004FED1E.0001
- Page: https://openairdocs.org/proposed/FAA-2006-25738

## Summary

We propose to supersede an existing airworthiness directive (AD) that applies to all GE CF6-80C2B series turbofan engines. The existing AD currently requires installing software version 8.2.Q1 to the engine electronic control unit (ECU), which increases the engine's margin to flameout. Since we issued that AD, we have received reports of additional engine events. This proposed AD would require the removal of the affected ECUs from service. We are proposing this AD to prevent engine flameout or un-commanded engine in-flight shutdown (IFSD) of one or more engines, leading to an emergency or forced landing of the airplane.

## Notices in this docket

- Oct 24, 2006: Notice of proposed rulemaking (NPRM). (first notice), FR document E6-17742, comments due Dec 26, 2006 (https://www.federalregister.gov/documents/2006/10/24/E6-17742/airworthiness-directives-general-electric-company-ge-cf6-80c2b-series-turbofan-engines)
- Nov 14, 2011: Notice of proposed rulemaking (NPRM)., FR document 2011-29228, comments due Jan 13, 2012 (https://www.federalregister.gov/documents/2011/11/14/2011-29228/airworthiness-directives-general-electric-company-ge-cf6-80c2b-series-turbofan-engines)

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