AD 55-25-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Scotts-Bell 47 Inc | 47G | Airworthiness Directives; Bell Model 47G Helicopters |
Unsafe Condition
The lateral cyclic bellcrank attachment bolt P/N AN 174-34 is too short, positioning the threaded area in the forward lateral bellcrank support bracket hole, which may result in the threads flattening out and elongating the support bracket bolt hole.
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Required Actions
Inspect the bellcrank support bracket bolt holes for elongation. Replace the AN 174-34 bolt with a longer bolt P/N AN 174-35 unless doubler plates are added, in which case install AN 174-36 bolts. If holes are elongated beyond 0.2520 inch diameter, add doubler plates and redrill and line ream new holes.
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Compliance Time
as soon as practical but not later than January 15, 1956
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Affected Aircraft
Bell Model 47G Helicopters Below Serial Number 1450 Which Have Hydraulic Boost System Installed
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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