AD 2005-20-21
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Fokker | F27 Mark 050 | Airworthiness Directives; Fokker Model F27 Mark 050 Airplanes |
Unsafe Condition
Oil leakage at the engine feathering pump, resulting from a damaged seal on one of the bobbins between the feathering pump and the engine reduction gearbox, could cause the engine to shut down in flight.
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Required Actions
Perform repetitive visual checks for oil leaks of both engines between the spinner and the engine cowling, and directly behind the heated intake lip of the engine. Conduct repetitive inspections for oil leaks at the feathering pump on both engines. Take corrective actions if necessary, including replacing the O-rings of the feathering pump bobbins and the mounting pad gasket (if installed) with new parts.
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Compliance Time
Before further flight if a leak is found during the inspections.
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Affected Aircraft
Fokker Model F27 Mark 050 airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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