AD 95-10-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bell Helicopter Textron, Inc. | 204B | Airworthiness Directives; BELL HELICOPTER TEXTRON, INC. Model 205A, 205A-1, and 204B helicopters |
| aircraft | Bell Helicopter Textron, Inc. | 205A | Airworthiness Directives; BELL HELICOPTER TEXTRON, INC. Model 205A, 205A-1, and 204B helicopters |
| aircraft | Bell Helicopter Textron, Inc. | 205A-1 | Airworthiness Directives; BELL HELICOPTER TEXTRON, INC. Model 205A, 205A-1, and 204B helicopters |
Unsafe Condition
Failure of the 42-degree tail rotor drive gearbox assembly due to cracks at the roots of the gear teeth on the pinion or gear, leading to loss of tail rotor control and subsequent loss of control of the helicopter.
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Required Actions
Verify tail rotor control system rigging per maintenance manual before further flight. Disassemble and inspect the 42-degree gearbox for gear tooth cracks every 400 torque events using approved fluorescent penetrant inspection. Replace cracked gears and create a component history card recording torque events daily.
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Compliance Time
Before further flight, and thereafter at intervals not to exceed 400 torque events
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Affected Aircraft
Bell Helicopter Textron, Inc. Model 205A, 205A-1, and 204B helicopters with a 42-degree tail rotor drive gearbox assembly (part number 204-040-003-023 or -037) installed.
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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