AD 70-14-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Scotts-Bell 47 Inc | 47D | Airworthiness Directives; Bell Model 47D, 47D-1, 47G, 47G-2 and 47H-1 Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47D1 | Airworthiness Directives; Bell Model 47D, 47D-1, 47G, 47G-2 and 47H-1 Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47G | Airworthiness Directives; Bell Model 47D, 47D-1, 47G, 47G-2 and 47H-1 Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47G-2 | Airworthiness Directives; Bell Model 47D, 47D-1, 47G, 47G-2 and 47H-1 Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47H-1 | Airworthiness Directives; Bell Model 47D, 47D-1, 47G, 47G-2 and 47H-1 Helicopters |
Unsafe Condition
Failure of the tail rotor hub assembly bolt due to a fatigue crack and improper installation of the hub bolt.
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Required Actions
Replace bolts with 550 hours or more total time in service within the next 50 hours time in service. Inspect bolts with less than 550 hours total time using magnetic particle or equivalent inspection, replace cracked bolts before further flight. Replace all bolts at or prior to 600 hours total time in service. Install bolts per specified maintenance manual or equivalent FAA approved procedures.
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Compliance Time
Within the next 50 hours time in service
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Affected Aircraft
Bell Model 47D, 47D-1, 47G, 47G-2, and 47H-1 helicopters equipped with tail rotor hub assembly bolt P/N 47-641-052-3.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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