AD 2001-17-17
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron | Various | Airworthiness Directives; Bell Helicopter Textron, Inc. Model 47B, 47B-3, 47D, 47D-1, 47G, 47G-2, 47G2A, 47G-2A-1, 47G-3, 47G-3B, 47G-3B-1, 47G-3B-2, 47G-3B-2A, 47G-4, 47G-4A, 47G-5, 47G-5A, 47H-1, 47J, 47J-2, 47J-2A, and 47K Helicopters |
| aircraft | Bell | Helicopter Textron | Airworthiness Directives; Bell Helicopter Textron, Inc. Model 47B, 47B-3, 47D, 47D-1, 47G, 47G-2, 47G2A, 47G-2A-1, 47G-3, 47G-3B, 47G-3B-1, 47G-3B-2, 47G-3B-2A, 47G-4, 47G-4A, 47G-5, 47G-5A, 47H-1, 47J, 47J-2, 47J-2A, and 47K Helicopters |
Unsafe Condition
Failure of the main rotor blade grip (grip) threads due to fatigue cracks leading to loss of a main rotor blade and subsequent loss of control of the helicopter.
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Required Actions
Perform recurring eddy current inspections of the grip threads for cracks. Replace any cracked grip with an airworthy grip before further flight. Report inspection results to the FAA Rotorcraft Certification Office. Limit each grip's retirement life to 1200 hours time-in-service.
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Compliance Time
Before further flight if a crack is detected. Reporting must be done after inspections.
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Affected Aircraft
Bell Helicopter Textron models 47B, 47B-3, 47D, 47D-1, 47G series variants up to 47K helicopters, including parts P/N R74-120-252-11 and R74-120-135-5.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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