AD 70-14-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Scotts-Bell 47 Inc | 47D1 | Airworthiness Directives; Bell Model 47D-1, 47G, 47G-2, and 47H-1 Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47G | Airworthiness Directives; Bell Model 47D-1, 47G, 47G-2, and 47H-1 Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47G-2 | Airworthiness Directives; Bell Model 47D-1, 47G, 47G-2, and 47H-1 Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47H-1 | Airworthiness Directives; Bell Model 47D-1, 47G, 47G-2, and 47H-1 Helicopters |
Unsafe Condition
Failure of tail rotor duplex pitch change bearing and improper installation of the duplex bearing and delta hinge bolts.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect all duplex pitch change bearings within 50 hours time in service after the effective date. Replace bearings with 450+ hours time in service within 150 hours. Replace bearings with less than 450 hours before accumulating 600 hours. Use new P/N 47-641-131-1 and follow specified maintenance procedures.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Compliance required as indicated in the AD: inspections and replacements must be done within specified time frames (50, 150, or 600 hours time in service) as per the bearing's time in service on the effective date.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Bell Model 47D-1, 47G, 47G-2, and 47H-1 helicopters with duplex pitch change bearings P/N 47-641-131-1 or equipped with guide sleeves P/N 47-641-040 or 47-641-130.
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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