Airworthiness Directives; Airbus Model A300 B4-600, B4-600R, and F4-600R Series Airplanes, and Model C4-605R Variant F Airplanes (Collectively Called A300-600 Series Airplanes); and Airbus Model A310 Series Airplanes

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The FAA proposes to adopt a new airworthiness directive (AD) for certain Airbus airplanes, listed above. This proposed AD would require installing two-stage relays in the electronics rack (90VU), and performing related corrective and investigative actions. This proposed AD is prompted by reports of in advertent rudder trim activation when the autopilot is on. We are proposing this AD to prevent inadvertent trim activation when the autopilot is on and the slats are extended, which could result in rudder activation when the autopilot is turned off.