Interesting, grog. What is the cause of the bias toward left PLM over right?
I note that the rudder trim system maintenance manual pages you posted seem to me to show an autopilot servo in the system. However, the ATSB report says:
The [rudder trim] system has no connection to the autopilot/yaw damper or electric trim systems.
Am I misreading the maintenance manual pages or are they for a model different to ZCR?
ATSB’s detailed examination of the actuator concludes:
Cable damage supports both the left and right cables being under high tension as a result of impact forces. In addition, the lack of any additional abrasion damage to the housing from cable contact indicates that the cable had not spooled through the actuator drum during the accident sequence.
So ATSB discounts the suggestion that the cable broke and was pulled through the actuator due to forces during the crash.