AD 57-12-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Scotts-Bell 47 Inc | 47H-1 | Airworthiness Directives; Bell Model 47H1 Helicopters |
Unsafe Condition
Possible failure of the tail boom attach bolts due to insufficient spot facing of bolt hole locations in the tail boom attach fittings 47-265-026-1 and -2.
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Required Actions
Visually inspect the four tail boom attach fittings to determine if all eight bolt hole locations have been spot faced. If any bolt holes are not spot faced, they must be spot faced in accordance with Bell Mandatory Service Bulletin No. 116.
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Compliance Time
as soon as possible but not later than August 1, 1957
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Affected Aircraft
Scotts-Bell 47 Inc Model 47H-1 Helicopters, serial numbers 1349, 1351 through 1360, 1362, 1363, 1365 through 1371.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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