CONTROL/ INDICATOR
Alphanumeric Display
Frequency Display
Entry keypad
CLR ENT T/R INTG
MODE Select switch
OFF
BIT
FREQ
CODE
BRST
CONT
HOME
CHAN Selector A B
243.0
282.8
VOL knob
Remote Display Unit (on instrument panel)
FUNCTION
Indicate system mode of operation.
Indicates frequency of operation in the BRST, CONT, and HOME modes, or 6 digit survivor ID code, or results of BIT.
Used for survivor selection, survivor ID code entry, and channel A and B frequency selection.
Deletes indication on display.
Enters displayed value in memory.
Controls radio interrogation operations.
Locked out in OFF position. Pull and turn to change from OFF to any other position.
Removes power from set.
Starts built in test.
Enables entry of desired frequency.
Enables entry of codes for up to nine AN/PRC-112 radios.
Each interrogation is triggered with a manual command.
Interrogations are automatically transmitted by system.
Operates as direction .nding receiver.
Selects Channel A frequencies.
Selects Channel B frequencies.
Selects preset 243.0 MHz.
Selects preset 282.8 MHz.
Not connected.
ALPHANUMERIC
FREQUENCY DISPLAY
ENTRY KEYPAD
AB0616
SA
Figure 3-26. PLS Central Display Unit
CONTROL/ FUNCTION CONTROL/ FUNCTION
INDICATOR INDICATOR
NO UPDT In BRST mode, indicates no Bargraph and Gives pilot visual steering
response to last interrogation. Bullseye directions to survivor.
In HOME mode, indicates receive A solid bullseye is displayed when
signal strength below receive the helicopter in line with the
threshold. If any data has been survivor. As the helicopter turns
received, display retains the last away from the in line position, the
valid reading until another survivor bullseye extinguishes, and vertical
is selected. bars light up indicating direction of
FT NM Indicate FT when distance is less than 9900 ft, and NM when range is greater than 9900 ft. turn needed to line up with the survivor. The bargraph will activate one bar on each side of the solid sphere if a steering command has
Distance display Indicates distance from survivor. not been received, or when the
system is in BRST, CONT,or
HOME mode.
DISTANCE DISPLAY
AB0617
SA
3.17.3 Modes of Operation.
3.17.3.1 Test Mode. Test mode is selected when the mode switch is in the BIT position. Built in test (BIT) takes approximately 5 seconds, and results in a display of BIT PASS or the name of the failed unit followed by FAIL.
3.17.3.2 Data Entry Mode. Data entry mode is selected when the mode switch is in the FREQ or CODE position. Use this mode to select and enter transponder codes and frequencies for the system to use.
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