AD 47-35-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Holmes, Douglas W. | R-4B (Army) | Airworthiness Directives; Sikorsky Model R44-B Helicopter |
Unsafe Condition
Failure of the main rotor links due to lack of lubrication causing loss of flight control.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Re-work main rotor links (P/N VS 36181) by removing and inspecting for cracks, machining oil grooves, replacing bearings with P/N AT-16-OH if original bearings are P/N AT-16, and following specified cleaning and inspection methods.
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Compliance Time
before November 15, 1947
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Affected Aircraft
Sikorsky Model R4-B Helicopter Serial Numbers 43-46500 to 43-46502 and 43-46504 to 43-46539 Inclusive.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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