AD 47-51-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Scotts-Bell 47 Inc | 47B | Airworthiness Directives; Bell Model 47B Series Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47B3 | Airworthiness Directives; Bell Model 47B Series Helicopters |
Unsafe Condition
The transmission pinion gear bearings may have insufficient service life without rework in accordance with Bell Service Bulletin No. 47C4.
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Required Actions
Install new bearings P/N 47-820-358-1 in the upper spider assembly and P/N 47-620-357-1 in the lower stage spider assembly pinion gear at the 100-hour teardown inspection. Ensure rework per Bell Service Bulletin No. 47C4.
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Compliance Time
at the 100-hour teardown inspection
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Affected Aircraft
Scotts-Bell 47 Inc Model 47B and 47B3 helicopters
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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