AD 47-32-14
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Scotts-Bell 47 Inc | 47B | Airworthiness Directives; Bell Model 47B Helicopters |
Unsafe Condition
Shifting of the engine mount assembly due to insufficient clamping of the engine mount to the rubber mounts, which can cause misalignment of the tail rotor drive quill and tail rotor drive shaft and powerplant installation.
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Required Actions
Inspect AN 365-524 nuts on AN 5-20A bolts in the 'clamp' ends of the 47-612-111-1 engine mount assembly for bottoming. If found, remove bolts, install AN 960-516 washers under bolt heads, replace bolts, install nuts loosely, check engine mount assembly installation on rubber mounts ensuring front face of left mount 'clamp' is 5/32 inch aft of metal case front face, and torque nuts to 100-140 inch-pounds.
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Compliance Time
At intervals not to exceed 100-hours.
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Affected Aircraft
Scotts-Bell 47 Inc Model 47B Helicopters, serial numbers 5, 6, and 10.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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