# Proposed AD FAA-2015-0486: Pratt & Whitney Canada Corp. Turboshaft Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2015-20-04
- Products: Pratt & Whitney Canada
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: June 19, 2015, 80 FR 35260
- Comments due: August 18, 2015
- Became: [AD 2015-20-04](https://openairdocs.org/ad/2015-20-04)
- Docket: FAA-2015-0486 (https://www.regulations.gov/docket/FAA-2015-0486, where comments are filed)
- Project: 2015-NE-07-AD
- FR document: 2015-14986
- Official PDF: https://openairdocs.org/files/sha256/1a/1c/1a1c41d2a22c12c94b8c8829ad6957ad47edd4a6eff83c5b10f393dde79fdf47 (from https://www.govinfo.gov/content/pkg/FR-2015-06-19/pdf/2015-14986.pdf)
- Federal Register: https://www.federalregister.gov/documents/2015/06/19/2015-14986/airworthiness-directives-pratt-and-whitney-canada-corp-turboshaft-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/614070D5046BC8C786257E69004C6C60.0001
- Page: https://openairdocs.org/proposed/FAA-2015-0486

## Summary

We propose to adopt a new airworthiness directive (AD) for certain Pratt & Whitney Canada Corp. (P&WC) PT6B-37A turboshaft engines. This proposed AD was prompted by reports of incorrect engine torque for PT6B-37A engines. This proposed AD would require initial and repetitive inspections until replacement of the No. 10 bearing, and eventual replacement of the No. 9 bearing, both located in the engine reduction gearbox (RGB) assembly. We are proposing this AD to prevent axial migration of the No. 10 bearing in the engine RGB assembly, which could lead to engine overtorque, failure of the engine, in-flight shutdown, and loss of the rotorcraft.

## Notices in this docket

- Jun 19, 2015: Notice of proposed rulemaking (NPRM). (first notice), FR document 2015-14986, comments due Aug 18, 2015 (https://www.federalregister.gov/documents/2015/06/19/2015-14986/airworthiness-directives-pratt-and-whitney-canada-corp-turboshaft-engines)

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