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1. Description
The Z131 Rudder Reference contains a single turn 5k ohm plastic potentiometer to
provide the autopilot with rudder position information. When replacing, correct
installation is vital if optimum steering performance is to be achieved. The Rudder
Reference unit arm movement is limited to +/-60 degrees. Care must be taken to
ensure that the arm is opposite the cable entry when the rudder is amidships. Failure
to do this could result in damage to the Rudder Reference if the arm is driven into its
end stops by the steering system. Once detected as faulty the Rudder Reference unit
should be replaced as a complete unit.
2. Functional Test
The Rudder Reference unit, when disconnected from the autopilot, can be
functionally tested by checking the following resistance measurements:-
Cable colour Arm position Resistance
Green/Red Any position 5k ohm +/-5%
Blue/Green Anticlockwise stop 1.66k ohm +/-10%
Blue/Green Clockwise stop 3.33k ohm +/-10%
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