AD 70-10-08
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
Failure of tail rotor blades due to fatigue cracks in the tail rotor grips between Blade Station 2.7 and 3.7, tail rotor blade trailing edge between Blade Station 5.0 and 8.0, and areas surrounding rivets attaching blade skin to the grip.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Visually inspect tail rotor grips, trailing edge, and rivet areas daily and after refueling using magnifying glasses. Check tabs for deformation or strike indications. Replace blades with cracks, deformation, bent tabs, or strike indications before flight (except float-equipped helicopters may fly up to 1.5 hours with bent tabs or strike indications). Install tabs or equivalent strike-detection devices on float-equipped helicopters within 300 blade hours after November 25, 1966. Provide clear blade visibility within 10 hours after AD 68-02-03. Perform internal inspections and replace blades based on time-in-service thresholds. Conduct recurring external inspections every 25 hours' time in service.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before first flight of each day and before first flight after each refueling after July 20, 1976. Compliance required within specified intervals: 300 blade hours, 10 hours, 25 hours, 150 hours, 100 hours, 600 hours, and 25 hours recurring.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Scotts-Bell 47 Inc Model 47, 47B, 47B3, 47D, 47D1, 47E, 47G, 47G-2, 47G-2A, 47G-2A-1, 47G-3, 47G-3B, 47G-3B-1, etc., equipped with metal tail rotor blades P/N 47-642-102. Not applicable to P/N 47-642-117 blades.
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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