AD 51-26-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Scotts-Bell 47 Inc | 47B | Airworthiness Directives; Bell Model 47B, 47B3, 47D, 47D1 Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47B3 | Airworthiness Directives; Bell Model 47B, 47B3, 47D, 47D1 Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47D | Airworthiness Directives; Bell Model 47B, 47B3, 47D, 47D1 Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47D1 | Airworthiness Directives; Bell Model 47B, 47B3, 47D, 47D1 Helicopters |
Unsafe Condition
Tail rotor failures due to insufficient strength at the junction of the stainless steel leading edge and root end area of the blades.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Wrap each tail rotor blade with two strips of unidirectional fiberglass cloth (Bell P/N 47-642-020-14) across the junction of the stainless steel leading edge at the root end. Inspect daily for loosening, lifting, cracks in the leading edge, flanges, and root area; replace blades immediately if conditions exist.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Compliance required by October 15, 1951, unless Bell Service Instruction 67S1 has been accomplished already. Daily inspections required.
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Affected Aircraft
Bell Model 47B, 47B3, 47D, 47D1 Helicopters.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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