AD 70-08-02
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
Failure from internal corrosion of tail rotor drive shaft assemblies with part numbers 47-644-172-3, 47-644-180-1, 47-644-180-5, 47-644-214-1, 47-644-186-1, 47-644-187-5, or 47-644-187-11.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove and replace the specified tail rotor drive shaft assemblies with the corresponding replacements listed in Bell Service Bulletin No. 47-145, Rev. B. Compliance must be completed no later than March 1, 1971, with replacement recommended at the next 1200-hour overhaul.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
no later than March 1, 1971
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, and other models incorporating tail rotor drive shaft assemblies with part numbers 47-644-172-3, 47-644-180-1, 47-644-180-5, 47-644-214-1, 47-644-186-1, 47-644-187-5, or 47-644-187-11.
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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