AD 47-35-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Holmes, Douglas W. | R-4B (Army) | Airworthiness Directives; Sikorsky Model R-4B AAF Helicopter |
Unsafe Condition
The increased overhang of the tail rotor gearbox causes an unsafe load distribution on the aft boom.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Install diagonal brace assemblies S38566 and S38567 with specified bolts, washers, nuts, and cotter pins. Ensure the brace center is within 1 1/8 inches of the vertical tube S38505-23. Secure with friction tape or material to prevent abrasion, drill and bolt brace sections, and touch up paint if damaged.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
prior to November 15, 1947
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Sikorsky Model R-4B AAF Helicopter serial numbers 43-46500 and 43-46504 to 43-46567 inclusive.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.