AD 2000-25-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron | Inc | Airworthiness Directives; Bell Helicopter Textron Inc. Model 205A-1, 205B, 212, 412, and 412CF Helicopters |
| aircraft | Bell | Helicopter Textron Inc | Airworthiness Directives; Bell Helicopter Textron Inc. Model 205A-1, 205B, 212, 412, and 412CF Helicopters |
Unsafe Condition
The locking washer on the main rotor actuator is subject to mechanical damage and failure, which allows the actuator piston to unthread itself from its rod end, potentially causing loss of collective control of the main rotor and subsequent loss of control of the helicopter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the tab on the NAS513-6 locking washer on all actuators for twisting or damage within 25 hours time-in-service (TIS). Replace any twisted or damaged locking washer with an airworthy NAS1193K6C locking device before further flight. Replace all NAS513-6 locking washers with airworthy NAS1193K6C locking devices within 100 hours TIS or at the next actuator overhaul, whichever occurs first. Installing an airworthy NAS1193K6C locking device on all actuators constitutes terminating action for the AD.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 25 hours time-in-service for initial inspection and replacement of damaged washers; within 100 hours time-in-service or at the next actuator overhaul for replacement of all washers.
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Affected Aircraft
Bell Helicopter Textron Inc. Model 205A-1, 205B, 212, 412, and 412CF helicopters with actuators, part number (P/N) 41105950 (serial numbers with an 'HR' prefix up to and including 490) or P/N 41000470 (serial numbers with an 'HR' prefix up to and including 10010), installed.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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