AD 48-12-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Scotts-Bell 47 Inc | 47B | Airworthiness Directives; Bell Model 47B Series and 47D Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47B3 | Airworthiness Directives; Bell Model 47B Series and 47D Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47D | Airworthiness Directives; Bell Model 47B Series and 47D Helicopters |
Unsafe Condition
The dural shear screws in the transmission spider assembly may fail due to insufficient strength, leading to potential transmission failure.
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Required Actions
Replace the dural shear screws in the transmission spider assembly with steel shear screws (P/N 47-620-485-1) at the next 100-hour teardown inspection if less than 600 hours have been accumulated. If over 600 hours have been accumulated, the replacement must be accomplished immediately.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
next 100-hour teardown inspection if less than 600 hours have been accumulated. If over 600 hours have been accumulated, this change must be accomplished immediately
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Scotts-Bell 47 Inc Models 47B Series, 47B3, and 47D 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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