# Proposed AD FAA-2005-22594: Rolls-Royce Corporation (formerly Allison Engine Company, Allison Gas Turbine Division, and Detroit Diesel Allison) 250-B and 250-C Series Turboprop and Turboshaft Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2006-13-06
- Products: Rolls-Royce
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: November 10, 2005, 70 FR 68381
- Comments due: January 9, 2006
- Became: [AD 2006-13-06](https://openairdocs.org/ad/2006-13-06)
- Docket: FAA-2005-22594 (https://www.regulations.gov/docket/FAA-2005-22594, where comments are filed)
- Project: 2005-NE-28-AD
- FR document: 05-22437
- Official PDF: https://openairdocs.org/files/sha256/73/6e/736e101b109a3dbf53bfbd61b0e618820361a4157208288b8517d900005aea45 (from https://www.govinfo.gov/content/pkg/FR-2005-11-10/pdf/05-22437.pdf)
- Federal Register: https://www.federalregister.gov/documents/2005/11/10/05-22437/airworthiness-directives-rolls-royce-corporation-formerly-allison-engine-company-allison-gas-turbine
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/1AEB7F8B62732FCE862570B5005DE9F2.0001
- Page: https://openairdocs.org/proposed/FAA-2005-22594

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for Rolls-Royce Corporation 250-B and 250-C series turboprop and turboshaft engines with certain part numbers (P/Ns) of gas producer rotor assembly tie bolts manufactured by EXTEX Ltd., Pacific Sky Supply Inc., Rolls-Royce Corporation (RRC), and Superior Air Parts Inc. This proposed AD would require operators to remove from service affected gas producer rotor assembly tie bolts. This proposed AD results from eleven reports of RRC tie bolt failure due to high cycle fatigue. We are proposing this AD to prevent tie bolt failure that could cause loss of engine power, resulting in a first stage turbine wheel overspeed and an uncontained engine failure.

## Notices in this docket

- Nov 10, 2005: Notice of proposed rulemaking (NPRM). (first notice), FR document 05-22437, comments due Jan 9, 2006 (https://www.federalregister.gov/documents/2005/11/10/05-22437/airworthiness-directives-rolls-royce-corporation-formerly-allison-engine-company-allison-gas-turbine)

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