B&G Network Autopilot - Manual (Page 20)

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The RRU can be mounted in many different positions and orientations
depending on the layout of the steering system.
If the maximum rudder angle is less than 90º then the position of the
RRU or the drag-link must be adjusted so that the operating arm of the
RRU swings through a minimum of 90º and the output voltage
difference is greater than 1 volt from port to starboard lock. Measure the
output of the RRU between the green and blue wires. N.B. If there is
less than 1 Volt difference the Pilot will not commission.
1V MINIMUM
VARIATION
90° MINIMUM RRU ANGLE