AD 47-32-15
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sikorsky Aircraft Corporation | S-51 | Airworthiness Directives; Sikorsky Model S-51 Helicopters |
Unsafe Condition
Excessive grease and foreign matter adhering to the control system chain and sprockets could cause possible malfunctioning of the flight control system.
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Required Actions
Inspect the control system chain and sprockets for excessive grease and foreign matter. Remove any excessive grease and foreign matter prior to next flight. Follow Sikorsky Service Information Circular No. 17 for recommended procedure at first disassembly.
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Compliance Time
prior to next flight
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Affected Aircraft
Sikorsky Model S-51 Helicopters
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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