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 TM 55-1905-219-14-1
STEERING RUDDER REPEATBACK UNIT.
a. The Rudder Repeatback (Figure 1-60l consists of a follow-up potentiometer and limit switches enclosed in a
water proof housing. The potentiometer is positioned by a direct mechanical connection to the rudder quadrant and
furnishes a rudder follow-up signal to the steering amplifier in the Steering Control Unit. The unit also limits the rudder
order in hand-electric operation. When used with the gyropilot, a second set of limit switches provides rudder limits to
prevent excessive rudder angles during course changes.
b. The Rudder Repeatback Potentiometer forms one-half of a balanced Wheatstone bridge, the other half of the
bridge being in the rudder order portion of the steering equipment.
c. When the control potentiometer in the rudder order equipment is moved, an order signal is generated which
causes the rudder positioning equipment to move the rudder. The rudder then rotates the Rudder Repeatback
potentiometer which cancels the order signal. When the rudder reaches the ordered position, the signals from the control
potentiometer and the Rudder Repeatback potentiometer are equal and opposite. The rudder will stay in the ordered
position until the control potentiometer is moved again.
d. In hand-electric operation, a pair of cam-operated limit switches open the control circuit to the rudder
positioning equipment a few degrees before the rudder reaches its mechanical limits.
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