AD 2020-18-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney | Canada Corp | Airworthiness Directives; Pratt & Whitney Canada Corp. Turboshaft Engines |
Unsafe Condition
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).
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Required Actions
Replace the FCU with an FCU that incorporates a stainless steel air adapter using Pratt & Whitney Canada Corp. Service Bulletin (SB) No. PT6B-72-39107, Revision No. 1, dated December 13, 2017.
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Compliance Time
Within 50 flight hours
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Affected Aircraft
Pratt & Whitney Canada Corp. (P&WC) PT6B-37A model turboshaft engines with engine serial number PCE-PU0289 and earlier.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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