# Airworthiness Directives; Rolls-Royce Corporation (RRC) (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 2005-10-03 · Effective 2005-10-18 · 70 FR 57487
## Document
- **Document number:** 05-19693
- **Category:** airworthiness
- **Manufacturer:** Rolls-Royce Corporation (RRC) (formerly Allison
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 70 FR 57487
- **Publication date:** 2005-10-03
- **Effective date:** 2005-10-18
- **FAA docket:** Docket No. FAA-2005-22534
## 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. This AD requires a onetime visual inspection of the seal joint in each passage between airfoils at the hub and shroud of third-stage turbine wheels, part number (P/N) 6899383. This AD results from reports of three failed third-stage turbine wheels and from the manufacturer's analysis of those failures. We are issuing this AD to prevent loss of power and uncommanded engine shutdown due to failure of the third-stage turbine wheel.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2005/10/03/05-19693/airworthiness-directives-rolls-royce-corporation-rrc-formerly-allison-engine-company-allison-gas)
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