AD 53-01-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Scotts-Bell 47 Inc | 47D1 | Airworthiness Directives; Bell Model 47D1 Helicopters |
Unsafe Condition
The existing method of mounting the tail rotor gearbox assembly may distort the S10R bearing when tightening the existing clamp, creating a potential failure mode.
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Required Actions
Install sleeve P/N 47-640-058-1 on assembly 47-640-044-3. Replace clamping ring P/N 47-644-197-1 and clamp P/N 47-640-046-1 with the riveted sleeve.
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Compliance Time
at next 300-hour teardown inspection but not later than February 28, 1953
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Affected Aircraft
Scotts-Bell 47 Inc Model 47D1 Helicopters, Serial Numbers 477 to 625, Inclusive
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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