# Airworthiness Directives; Pratt & Whitney Canada Corp. Turboshaft Engines
> **Rule** · Final rule. · Published 2019-11-19 · Effective 2019-12-24 · 84 FR 63797
## Document
- **Document number:** 2019-25010
- **Category:** airworthiness
- **Manufacturer:** Pratt & Whitney Canada Corp. Turboshaft
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 84 FR 63797
- **Publication date:** 2019-11-19
- **Effective date:** 2019-12-24
- **FAA docket:** Docket No. FAA-2018-0739
## Abstract

The FAA is superseding Airworthiness Directive (AD) 2015-20-04 for certain Pratt & Whitney Canada Corp. (P&WC) PT6B-37A turboshaft engines. AD 2015-20-04 required 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. This AD requires removal from service and replacement of the No. 9 and No. 10 position bearings. This AD was prompted by reports of incorrect engine torque for PT6B-37A turboshaft engines. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2019/11/19/2019-25010/airworthiness-directives-pratt-and-whitney-canada-corp-turboshaft-engines)
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