# Proposed AD FAA-2012-0416: Pratt & Whitney Canada Corp. Turboprop Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2012-11-14
- Products: Pratt & Whitney Canada
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: September 14, 2012, 77 FR 56794
- Comments due: November 13, 2012
- Became: [AD 2012-11-14](https://openairdocs.org/ad/2012-11-14)
- Docket: FAA-2012-0416 (https://www.regulations.gov/docket/FAA-2012-0416, where comments are filed)
- Project: 2012-NE-13-AD
- FR document: 2012-22527
- Official PDF: https://openairdocs.org/files/sha256/88/b9/88b96c7bbf934b56d95b22bdbcf612597436a5b1b28ba9d5d1d89579cdecf239 (from https://www.govinfo.gov/content/pkg/FR-2012-09-14/pdf/2012-22527.pdf)
- Federal Register: https://www.federalregister.gov/documents/2012/09/14/2012-22527/airworthiness-directives-pratt-and-whitney-canada-corp-turboprop-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FC4E8B590675A25886257A790046C230.0001
- Page: https://openairdocs.org/proposed/FAA-2012-0416

## Summary

We propose to supersede an existing airworthiness directive (AD) that applies to all Pratt & Whitney Canada Corp. (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. The existing AD currently requires initial and repetitive inspections of certain serial numbers (S/Ns) of propeller shafts for cracks and removal from service if found cracked. Since we issued that AD, we determined the need to add a mandatory terminating action for the repetitive inspections. This proposed AD would require initial and repetitive inspections of certain S/Ns of propeller shafts for cracks and removal from service if found cracked, and would require removal from service of affected propeller shafts as mandatory terminating action to the repetitive inspections. We are proposing this AD to detect propeller shaft cracks, which could cause failure of the shaft, propeller release, and loss of control of the airplane.

## Notices in this docket

- Sep 14, 2012: Notice of proposed rulemaking (NPRM). (first notice), FR document 2012-22527, comments due Nov 13, 2012 (https://www.federalregister.gov/documents/2012/09/14/2012-22527/airworthiness-directives-pratt-and-whitney-canada-corp-turboprop-engines)

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