AD 50-38-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Scotts-Bell 47 Inc | 47B | Airworthiness Directives; Bell Model 47B, 47B-S, 47B3, 47B3-S, 47D, 47D-S and 47D1 Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47B3 | Airworthiness Directives; Bell Model 47B, 47B-S, 47B3, 47B3-S, 47D, 47D-S and 47D1 Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47D | Airworthiness Directives; Bell Model 47B, 47B-S, 47B3, 47B3-S, 47D, 47D-S and 47D1 Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47D1 | Airworthiness Directives; Bell Model 47B, 47B-S, 47B3, 47B3-S, 47D, 47D-S and 47D1 Helicopters |
Unsafe Condition
Fan bearing failure due to improper adjustment of the cooling fan belt, which allows the cooling fan to move forward and jam the cyclic controls.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Adjust the cooling fan belt tension properly and incorporate a fan shaft washer to prevent the fan from jamming the cyclic control in case of bearing failure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
before November 15, 1950
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Affected Aircraft
Bell Model 47B, 47B-S, 47B3, 47B3-S, 47D, 47D-S; Model 47D1, Serial Numbers 145 Through 164, 174 Through 183.
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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