# Proposed AD FAA-2004-18515: Rolls-Royce Corporation (Formerly Allison Engine Company, Allison Gas Turbine Division, and Detroit Diesel Allison) 250-B and 250-C Series Turbofan and Turboshaft Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2004-26-09
- Products: Rolls-Royce
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: July 1, 2004, 69 FR 39877
- Comments due: August 30, 2004
- Became: [AD 2004-26-09](https://openairdocs.org/ad/2004-26-09)
- Docket: FAA-2004-18515 (https://www.regulations.gov/docket/FAA-2004-18515, where comments are filed)
- Project: 2004-NE-12-AD
- FR document: 04-14945
- Official PDF: https://openairdocs.org/files/sha256/9b/aa/9baa4fbd444685e3115fa55d69a91e7b354ce8cef9d00390208ed1d423c4fc52 (from https://www.govinfo.gov/content/pkg/FR-2004-07-01/pdf/04-14945.pdf)
- Federal Register: https://www.federalregister.gov/documents/2004/07/01/04-14945/airworthiness-directives-rolls-royce-corporation-formerly-allison-engine-company-allison-gas-turbine
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/87BE69877671334D86256EC400627720.0001
- Page: https://openairdocs.org/proposed/FAA-2004-18515

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for Rolls-Royce Corporation (RRC) 250-B and 250-C series turbofan and turboshaft engines with certain part numbers (PNs) of compressor adaptor couplings manufactured by Alcor Engine Company (Alcor), EXTEX Ltd. (EXTEX), RRC, and Superior Air Parts (SAP) installed. This proposed AD would require operators to remove from service affected compressor adaptor couplings. This proposed AD results from nine reports of engine shutdown caused by compressor adaptor coupling failure. We are proposing this AD to reduce the risk of failure of the compressor adaptor coupling and subsequent loss of all engine power.

## Notices in this docket

- Jul 1, 2004: Notice of proposed rulemaking (NPRM). (first notice), FR document 04-14945, comments due Aug 30, 2004 (https://www.federalregister.gov/documents/2004/07/01/04-14945/airworthiness-directives-rolls-royce-corporation-formerly-allison-engine-company-allison-gas-turbine)

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