AD 56-25-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Scotts-Bell 47 Inc | 47 | Airworthiness Directives; Bell Model 47 Series Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47B | Airworthiness Directives; Bell Model 47 Series Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47B3 | Airworthiness Directives; Bell Model 47 Series Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47D | Airworthiness Directives; Bell Model 47 Series Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47D1 | Airworthiness Directives; Bell Model 47 Series Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47E | Airworthiness Directives; Bell Model 47 Series Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47G | Airworthiness Directives; Bell Model 47 Series Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47G-2 | Airworthiness Directives; Bell Model 47 Series Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47G-2A | Airworthiness Directives; Bell Model 47 Series Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47G-2A-1 | Airworthiness Directives; Bell Model 47 Series Helicopters |
Unsafe Condition
Excessive tolerance resulting from wear of the tail rotor pitch change rod assembly can result in the loss of the S1RP or 7R4AX1C bearings.
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Required Actions
Replace AN 960-416 washers or washers P/N 47-641-113-1 with washers having an O.D. dimension not greater than 0.552 inch or less than 0.549 inch.
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Compliance Time
Compliance required by December 22, 1956.
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Affected Aircraft
All Model 47 Series Helicopters Except the Following: Model 47G Serial Numbers 1529, 1530, 1687 and Up; Model 47G2 Serial Numbers 1505, 1506, 1508, 1617 and Up; Model 47H1 Serial Numbers 1369, 1371 and Up; Model 47J.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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