# Airworthiness Directives; Pratt & Whitney Canada Corp. Turboprop Engines
> **Rule** · Final rule. · Published 2014-07-01 · Effective 2014-08-05 · 79 FR 37171
## Document
- **Document number:** 2014-14955
- **Category:** airworthiness
- **Manufacturer:** Pratt & Whitney Canada Corp. Turboprop
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 79 FR 37171
- **Publication date:** 2014-07-01
- **Effective date:** 2014-08-05
- **FAA docket:** Docket No. FAA-2013-1009
## Abstract

We are adopting a new airworthiness directive (AD) for certain Pratt & Whitney Canada Corp. (P&WC) turboprop engines. This AD requires installing a reinforcement liner to the power turbine (PT) containment ring and, for certain PT containment rings, adding scallops. This AD was prompted by in-service events involving the perforation of engine cases as a result of the liberation of PT blades and the fracture/ displacement of the PT containment ring. We are issuing this AD to prevent uncontained engine failure and damage to the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2014/07/01/2014-14955/airworthiness-directives-pratt-and-whitney-canada-corp-turboprop-engines)
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