# Airworthiness Directives; Pratt & Whitney Canada Corp. Turboshaft Engines
> **Rule** · Final rule. · Published 2020-09-02 · Effective 2020-10-07 · 85 FR 54481
## Document
- **Document number:** 2020-19299
- **Category:** airworthiness
- **Manufacturer:** Pratt & Whitney Canada Corp. Turboshaft
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 85 FR 54481
- **Publication date:** 2020-09-02
- **Effective date:** 2020-10-07
- **FAA docket:** Docket No. FAA-2020-0471
## Abstract

The FAA is adopting a new airworthiness directive (AD) for all Pratt & Whitney Canada Corp. (P&WC) PT6B-37A model turboshaft engines with engine serial number PCE-PU0289 and earlier. This AD was prompted by a report of contamination from galvanic corrosion between the fuel control unit (FCU) aluminum body and the steel union fitting causing the loss of engine control, resulting in an engine over-speed condition and subsequent in-flight shutdown (IFSD). This AD requires replacing the FCU with a part eligible for installation. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2020/09/02/2020-19299/airworthiness-directives-pratt-and-whitney-canada-corp-turboshaft-engines)
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