AD Amdt-39-9491
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus | A310 and A300-600 | Airworthiness Directives; Airbus Model A310 and A300-600 Series Airplanes |
Unsafe Condition
Desynchronization of the hydraulic control valves directing fluid to the horizontal stabilizer actuator motors, which could lead to uncommanded movement of the trimmable horizontal stabilizer (THS) and potential runaway to full up or down position.
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Required Actions
Conduct repetitive inspections to ensure correct synchronization of the hydraulic control valves of the THS actuator. Replace horizontal stabilizer actuator motors with new or serviceable motors and resynchronize the valves, or adjust synchronization if needed. Perform a functional test of the THS.
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Compliance Time
Before further flight
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Affected Aircraft
Airbus Model A310 and A300-600 series airplanes
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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