AD 96-06-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bell Helicopter Textron Canada Limited | 206A | Airworthiness Directives; Bell Helicopter Textron, A Division of Textron Canada, Ltd. Model 206A and 206B Helicopters |
| aircraft | Bell Helicopter Textron Canada Limited | 206A-1 (OH-58A) | Airworthiness Directives; Bell Helicopter Textron, A Division of Textron Canada, Ltd. Model 206A and 206B Helicopters |
| aircraft | Bell Helicopter Textron Canada Limited | 206B | Airworthiness Directives; Bell Helicopter Textron, A Division of Textron Canada, Ltd. Model 206A and 206B Helicopters |
| aircraft | Bell Helicopter Textron Canada Limited | 206B-1 | Airworthiness Directives; Bell Helicopter Textron, A Division of Textron Canada, Ltd. Model 206A and 206B Helicopters |
Unsafe Condition
Failure of the main transmission input driveshaft assembly due to coupling wear or overheating, which could result in loss of power to the main rotor and a subsequent forced emergency landing.
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Required Actions
Visually check the driveshaft for grease leakage, damage, and secure clamps/bolts before each first flight daily. If discrepancies are found, disassemble and inspect the driveshaft, replace over-temperature indicators, and correct loose or damaged clamps/bolts as specified in service bulletin ASB No. 206-93-76. Inspect and lubricate the driveshaft assembly every 300 hours time-in-service, with initial compliance within the next 50 hours TIS if over 250 hours TIS, or before reaching 300 hours TIS if under 250 hours TIS.
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Compliance Time
Inspect and lubricate at intervals not to exceed 300 hours time-in-service (TIS). Initial compliance required within the next 50 hours TIS for helicopters with 250 hours TIS or more, or prior to attaining 300 hours TIS for those with less than 250 hours TIS.
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Affected Aircraft
Bell Helicopter Textron, A Division of Textron Canada, Ltd. Model 206A and 206B helicopters, certificated in any category.
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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