# Proposed AD FAA-2020-0471: Pratt & Whitney Canada Corp. Turboshaft Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2020-18-05
- Products: Pratt & Whitney Canada
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: May 14, 2020, 85 FR 28888
- Comments due: June 29, 2020
- Became: [AD 2020-18-05](https://openairdocs.org/ad/2020-18-05)
- Docket: FAA-2020-0471 (https://www.regulations.gov/docket/FAA-2020-0471, where comments are filed)
- Project: MCAI-2019-00126-E
- FR document: 2020-09944
- Official PDF: https://openairdocs.org/files/sha256/84/37/8437c58524478767eda464be813e96ee9c28ff10cdf51d4b1a4ba7a46d201a23 (from https://www.govinfo.gov/content/pkg/FR-2020-05-14/pdf/2020-09944.pdf)
- Federal Register: https://www.federalregister.gov/documents/2020/05/14/2020-09944/airworthiness-directives-pratt-and-whitney-canada-corp-turboshaft-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/1CD619E01D9F6BAC86258568004442DB.0001
- Page: https://openairdocs.org/proposed/FAA-2020-0471

## Summary

The FAA proposes to adopt 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 proposed 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 proposed AD would require replacing the FCU with a part eligible for installation. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- May 14, 2020: Notice of proposed rulemaking (NPRM). (first notice), FR document 2020-09944, comments due Jun 29, 2020 (https://www.federalregister.gov/documents/2020/05/14/2020-09944/airworthiness-directives-pratt-and-whitney-canada-corp-turboshaft-engines)

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