# Proposed AD FAA-2007-29001: General Electric Company CF34-8C1/-8C5/ -8C5B1/-8E5/-8E5A1, and CF34-10E Series Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2008-05-01
- Products: General Electric
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: September 7, 2007, 72 FR 51384
- Comments due: November 6, 2007
- Became: [AD 2008-05-01](https://openairdocs.org/ad/2008-05-01)
- Docket: FAA-2007-29001 (https://www.regulations.gov/docket/FAA-2007-29001, where comments are filed)
- Project: 2007-NE-36-AD
- FR document: E7-17680
- Official PDF: https://openairdocs.org/files/sha256/1b/47/1b47f13f005327ee1022e82dccb1deb30a75b27c9cc78fec60d73cda3a55c738 (from https://www.govinfo.gov/content/pkg/FR-2007-09-07/pdf/E7-17680.pdf)
- Federal Register: https://www.federalregister.gov/documents/2007/09/07/E7-17680/airworthiness-directives-general-electric-company-cf34-8c1-8c5-8c5b1-8e5-8e5a1-and-cf34-10e-series
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/702EC4959857BC778625734F004EA9D9.0001
- Page: https://openairdocs.org/proposed/FAA-2007-29001

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for General Electric Company (GE) CF34-8C1/-8C5/-8C5B1/-8E5/-8E5A1, and CF34-10E series turbofan engines with certain part number (P/N) and serial number (SN) fuel metering units (FMU) installed. This proposed AD would require a onetime test of the FMU for a miswired (reversed polarity) condition of the input wires to the overspeed solenoid. This proposed AD results from the discovery of miswired FMU overspeed solenoids in the field. We are proposing this AD to prevent the engine from failing to shutdown as commanded during an overspeed, leading to uncontained engine failure.

## Notices in this docket

- Sep 7, 2007: Notice of proposed rulemaking (NPRM). (first notice), FR document E7-17680, comments due Nov 6, 2007 (https://www.federalregister.gov/documents/2007/09/07/E7-17680/airworthiness-directives-general-electric-company-cf34-8c1-8c5-8c5b1-8e5-8e5a1-and-cf34-10e-series)

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