# Airworthiness Directives; Rolls-Royce Corporation (Formerly Allison Engine Company, Allison Gas Turbine Division, and Detroit Diesel Allison) Models 250-C28, -C28B, and -C28C Turboshaft Engines
> **Rule** · Final rule; request for comments. · Published 2004-07-09 · Effective 2004-07-26 · 69 FR 41389
## Document
- **Document number:** 04-15508
- **Category:** airworthiness
- **Manufacturer:** Rolls-Royce Corporation (Formerly Allison
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 69 FR 41389
- **Publication date:** 2004-07-09
- **Effective date:** 2004-07-26
- **FAA docket:** Docket No. FAA-2004-18538
## Abstract

The FAA is adopting a new airworthiness directive (AD) for Rolls-Royce Corporation (formerly Allison Engine Company, Allison Gas Turbine Division, and Detroit Diesel Allison) (RRC) models 250-C28, - C28B, and -C28C turboshaft engines with certain serial number (SN) third-stage turbine wheels, part number (P/N) 6899383. This AD requires replacing certain SN third-stage turbine wheels, P/N 6899383, before reaching new reduced life limits. This AD results from three reports of third-stage turbine blade and shroud failures. We are issuing this AD to prevent loss of power and uncommanded engine shutdown due to failure of third-stage turbine blades and shrouds.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2004/07/09/04-15508/airworthiness-directives-rolls-royce-corporation-formerly-allison-engine-company-allison-gas-turbine)
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