AD 58-26-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Scotts-Bell 47 Inc | 47G-2 | Airworthiness Directives; Bell Model 47G2 and 47J Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47J | Airworthiness Directives; Bell Model 47G2 and 47J Helicopters |
Unsafe Condition
The silver brazing process used on the engine cooling fan index plate assembly (P/N 47-661-801-5) may result in a defective bond between the fan index plate and fan shaft, leading to joint failure.
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Required Actions
Locate and drill three 0.2130-inch diameter holes (one 0.63-inch deep blind hole and two at intersections of indexing holes), tap with 1/4-28UNF3A, install AN 4H4A bolts and AN 960-416 washers, and safety wire with AN 995C32 lockwire. Exclude helicopters with P/N 47-661-801-25/21 or marked P/N 47-661-801-5 with a 1/4-inch deep by 0.56-inch diameter counterbore.
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Compliance Time
within next 25 hours of operation
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Affected Aircraft
Scotts-Bell 47 Inc Model 47G2 (serial numbers 2213, 2214, 2229, 2230, 2231, 2232, 2235 and subsequent) and Model 47J (serial numbers 1420, 1581, 1713, 1731, 1734, 1737, 1743, 1744, 1747, and subsequent) helicopters with engine cooling fan index plate assembly P/N 47-661-801-5 installed.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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