AD 2004-20-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney | Canada PT6B-36A and PT6B-36B | Airworthiness Directives; Pratt & Whitney Canada PT6B-36A and PT6B-36B Turboshaft Engines |
Unsafe Condition
Compressor rear hub, part number 3018111, exceeding the published life limit due to incorrect life limit calculation in a PWC Service Bulletin.
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Required Actions
Review and correct, if necessary, the critical part record for compressor rear hubs, P/N 3018111. Remove compressor rear hubs from service that exceed the published part life limit before further flight.
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Compliance Time
Before further flight
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Affected Aircraft
Pratt & Whitney Canada PT6B-36A and PT6B-36B turboshaft engines with compressor rear hubs, part number 3018111 installed. These engines are installed on, but not limited to, Sikorsky S-76B helicopters.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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