AD 49-52-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Scotts-Bell 47 Inc | 47B | Airworthiness Directives; Bell Model 47B, 47B3, 47D, and 47D1 Series Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47B3 | Airworthiness Directives; Bell Model 47B, 47B3, 47D, and 47D1 Series Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47D | Airworthiness Directives; Bell Model 47B, 47B3, 47D, and 47D1 Series Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47D1 | Airworthiness Directives; Bell Model 47B, 47B3, 47D, and 47D1 Series Helicopters |
Unsafe Condition
Main rotor hub fatigue cracks or damage from accidents or sudden stoppage, leading to blade separation or structural failure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace main rotor hub (Bell P/N 47-120-136-1) if involved in accident/sudden stoppage with blade damage showing steel core, damaged drag brace end fitting, or distorted equalizer horn. Replace aluminum hubs after 600 hours operation; earlier replacement may be required based on accumulated hours at directive receipt. Inspect hubs with less than 300 hours via visual check with 10- to 20-power glass at 300 hours for fatigue cracks in shotpeened fillet radius.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Compliance required as indicated.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Bell Model 47B, 47B3, 47D, and 47D1 Series 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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