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 TM 55-1905-220-14-1
1-61. HEADING SELECTOR.
a. The Heading Selector is used as an interface between a gyrocompass and steering control equipment to select the
desired heading of the vessel. The gyrocompass transmits actual heading data to the heading selector for comparing the
actual heading data with the ordered heading data. If the actual heading and the ordered heading are the same, there is
no signal output from the heading selector. If the actual heading and the ordered heading differ, the heading selector will
produce a signal that will cause the rudder positioning equipment to change the vessel's actual heading to its ordered
heading. Three-wire synchro data from the gyrocompass provides the heading information.
b. The Heading Selector consists of a circuit card 1882518 and associated controls and wiring mounted in an
enclosure. The unit is 'fitted with an adjustable mounting bracket that allows positioning for operating convenience.
1-62. MOTOR CONTROLLER.
The Motor Controller is an AC across-the-line nonreversing unit that controls the three-phase electric motor used with the
hydraulic pump on marine steering systems. The drip-proof case of the controller contains a LOCAL-OFF-REMOTE
switch and a RESET control on the front panel and houses the line contactor, power transformer, control relay, and fuses.
The controller also contains terminals to which remote accessory indicator lamps can be connected to show when the
motor is under overload conditions. The overload lamp will remain lighted after a brief overload has passed until the
remote RESET control is pushed. If the lamp remains lighted after the RESET control is pushed, the overload condition
still exists.
1-63. FLANKING RUDDER LIMIT SWITCH ASSEMBLY.
The Flanking Rudder Limit Switch moves the flanking rudders to hard left or hard right.
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