AD 74-25-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bell Helicopter Textron Canada Limited | 206A | Airworthiness Directives; Bell Model 206A and 206B Helicopters |
| aircraft | Bell Helicopter Textron Canada Limited | 206B | Airworthiness Directives; Bell Model 206A and 206B Helicopters |
Unsafe Condition
Failure of the rotor brake disc which could cause serious damage to critical components of the helicopter.
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Required Actions
Remove the engine to transmission driveshaft and aft coupling, remove the Rotor Brake Disc Assembly P/N 4000071 or 4000071-1, bolts, and gasket, reinstall the coupling and driveshaft, disable the brake by removing the P/N 156F538-4S-0061 hose assembly and capping the AN833-4C elbows with AN929-4J caps or equivalent, and follow Bell Service Bulletin 206-50-74-1 or FAA/DER approved revisions.
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Compliance Time
within the next ten hours' time in service after the effective date of this airworthiness directive unless already accomplished
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Affected Aircraft
Bell Helicopter Textron Canada Limited Model 206A and 206B helicopters equipped with Rotor Brake Kit P/N 206-706-032-1
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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