# Airworthiness Directives; Pratt & Whitney Canada Turboprop Engines
> **Rule** · Final rule; request for comments. · Published 2012-07-05 · Effective 2012-07-20 · 77 FR 39624
## Document
- **Document number:** 2012-16257
- **Category:** airworthiness
- **Manufacturer:** Pratt & Whitney Canada Turboprop
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 77 FR 39624
- **Publication date:** 2012-07-05
- **Effective date:** 2012-07-20
- **FAA docket:** Docket No. FAA-2012-0416
## Abstract

We are adopting a new airworthiness directive (AD) for all Pratt & Whitney Canada (P&WC) PW118, PW118A, PW118B, PW119B, PW119C, PW120, PW120A, PW121, PW121A, PW123, PW123B, PW123C, PW123D, PW123E, PW123AF, PW124B, PW125B, PW126A, PW127, PW127E, PW127F, PW127G, and PW127M turboprop engines. This AD requires initial and repetitive inspections of certain serial numbers (S/Ns) of propeller shafts for cracks and removal from service if found cracked. This AD was prompted by reports of two propeller shafts found cracked at time of inspection during maintenance. We are issuing this AD to detect propeller shaft cracks, which could cause failure of the shaft, propeller release, and loss of control of the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2012/07/05/2012-16257/airworthiness-directives-pratt-and-whitney-canada-turboprop-engines)
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