AD 47-41-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Scotts-Bell 47 Inc | 47B | Airworthiness Directives; Bell Model 47B and 47B3 Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47B3 | Airworthiness Directives; Bell Model 47B and 47B3 Helicopters |
Unsafe Condition
Failure of the inner race bearing attachment on the bottom of the main rotor mast could result in chipping and subsequent loss of main rotor mast integrity.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Incorporate a bolted retaining washer on the lower mast plug to improve attachment of the inner race bearing and prevent chipping.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
next 50-hour transmission teardown inspection after December 1, 1947
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Affected Aircraft
Scotts-Bell 47 Inc Model 47B and 47B3 Helicopters
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
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