# Airworthiness Directives; Rolls-Royce Corporation Models 250-C30, 250-C40, and 250-C47 Series Turboshaft Engines
> **Rule** · Final rule. · Published 2006-09-28 · Effective 2006-11-02 · 71 FR 56864
## Document
- **Document number:** 06-8230
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 71 FR 56864
- **Publication date:** 2006-09-28
- **Effective date:** 2006-11-02
- **FAA docket:** Docket No. FAA-2005-23392
## Abstract

The FAA is adopting a new airworthiness directive (AD) for Rolls-Royce Corporation (RRC) models 250-C30, 250-40, and 250-C47 series turboshaft engines with a third-stage turbine wheel, part number (P/N) 6898663 or P/N 23065843 installed, or a fourth-stage turbine wheel, P/N 6892764 or P/N 23066744, installed. This AD adds an additional life limit for third- and fourth-stage turbine wheels. This AD results from analysis by RRC of failures of third-stage turbine wheels. We are issuing this AD to prevent loss of power, possible engine shutdown, or uncontained engine failure.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2006/09/28/06-8230/airworthiness-directives-rolls-royce-corporation-models-250-c30-250-c40-and-250-c47-series)
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