AD 99-17-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bell Helicopter Textron, Inc. | 204B | Airworthiness Directives; Bell Helicopter Textron, Inc. Model 204B, 205A, and 205A-1 Helicopters |
| aircraft | Bell Helicopter Textron, Inc. | 205A | Airworthiness Directives; Bell Helicopter Textron, Inc. Model 204B, 205A, and 205A-1 Helicopters |
| aircraft | Bell Helicopter Textron, Inc. | 205A-1 | Airworthiness Directives; Bell Helicopter Textron, Inc. Model 204B, 205A, and 205A-1 Helicopters |
Unsafe Condition
Failure of the fin spar, loss of the tail rotor, and subsequent loss of control of the helicopter due to cracks in the vertical fin spar.
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Required Actions
Modify and visually inspect the fin spar for cracks per specified service bulletins. Replace the fin spar if cracks are found before further flight. Perform dye-penetrant inspections and tapping tests for disbonding. Replace certain fin spars within 12 months.
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Compliance Time
Within specified time-in-service intervals (e.g., 8 hours TIS for initial inspection, 300 hours TIS for repetitive inspections).
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Affected Aircraft
Bell Helicopter Textron Model 204B, 205A, and 205A-1 helicopters with specific fin spar part numbers installed.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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