AD 57-12-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Scotts-Bell 47 Inc | 47H-1 | Airworthiness Directives; Bell Model 47H1 Helicopters |
Unsafe Condition
Possible misalignment in the fore and aft synchronized elevator control pulley quadrant which may cause the control cables to be misaligned and cause chafing.
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Required Actions
Inspect the synchronized elevator control cables for alinement into the cable groove on the forward 47-267-112-5 pulley quadrant and the aft 47-267-410-1 elevator pulley quadrant. Inspect the forward 47-267-112-5 pulley quadrant support bracket bolt holes for elongation. If misalignment or bolt hole elongation exist, rework as outlined in Bell Service Bulletin No. 111 is required.
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Compliance Time
as soon as possible but not later than August 1, 1957
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Affected Aircraft
Bell Model 47H1 Helicopters Serial Numbers 1347 Through 1349 and 1351 Through 1371
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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