# Proposed AD FAA-2005-23392: Rolls-Royce Corporation (Formerly Allison Engine Company, Allison Gas Turbine Division, and Detroit Diesel Allison) Models 250-C30, 250-C40, and 250-C47 Series Turboshaft Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2006-20-07
- Products: Rolls-Royce
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: January 25, 2006, 71 FR 4065
- Comments due: March 27, 2006
- Became: [AD 2006-20-07](https://openairdocs.org/ad/2006-20-07)
- Docket: FAA-2005-23392 (https://www.regulations.gov/docket/FAA-2005-23392, where comments are filed)
- Project: 2005-NE-47-AD
- FR document: E6-898
- Official PDF: https://openairdocs.org/files/sha256/88/2b/882b765a8fe7fa8ff9b299f46ea46e4a10db8fb791f6cc7ea189d811fdcb743b (from https://www.govinfo.gov/content/pkg/FR-2006-01-25/pdf/E6-898.pdf)
- Federal Register: https://www.federalregister.gov/documents/2006/01/25/E6-898/airworthiness-directives-rolls-royce-corporation-formerly-allison-engine-company-allison-gas-turbine
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/100E2B8F8B78036486257101005A8B6C.0001
- Page: https://openairdocs.org/proposed/FAA-2005-23392

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for Rolls-Royce Corporation (formerly Allison Engine Company, Allison Gas Turbine Division, and Detroit Diesel Allison) (RRC) models 250-C30, 250-40, and 250-C47 series turboshaft engines. This proposed AD would add an additional life limit for third- and fourth-stage turbine wheels. This proposed AD results from analysis by RRC of failures of third- and fourth-stage turbine wheels. We are proposing this AD to prevent loss of power, possible engine shutdown, or uncontained failure.

## Notices in this docket

- Jan 25, 2006: Notice of proposed rulemaking (NPRM). (first notice), FR document E6-898, comments due Mar 27, 2006 (https://www.federalregister.gov/documents/2006/01/25/E6-898/airworthiness-directives-rolls-royce-corporation-formerly-allison-engine-company-allison-gas-turbine)

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