FILTER FILTER PAYLOAD
CONTROLDISPENSER MODULE
INSTRUMENT PANEL
ASSEMBLY
B
CHAFF / FLAREELECTRONIC
DISPENSER
FLARE ARM CHAFF
MODULE CONTROL PANEL
00 00
DISP CONT
ARM R IF MAN PGRM
RADAR SIGNAL
PI
PR
LE
DETECTOR
CONTROL PANEL
E
SAFETY PIN AND
SAFE
WARNING STREAMER
AUDIOPWR MODESELF
ON 1
+
OFF
2 TEST
COVER
SELECT SWITCH
CHAFF C (CHAFF) DISPENSE OR F (FLARE) SWITCH
CHAFF DISPENSE
LOWER CONSOLE
CHAFF DISPENSER AB0393A
SA
Figure 4-1. Mission Kits
B
A
4.1.3 Dispenser Assembly. The dispenser assembly (Figure 4-1) contains the breech assembly, C-F selector switch for either chaff or .ares, a reset switch, and a hous-ing containing the sequencer assembly. The sequencer as-sembly receives power through the .ring switches circuit and furnishes pulses to each of the 30 contacts of the breech assembly, in sequential order 1 through 30, thus .ring each of the impulse cartridges.
4.1.4 Payload Module Assembly. The payload mod-ule assembly (Figure 4-1) consists of the payload module and retaining plate assembly. The payload module has 30 chambers which will accept chaff. The chaff cartridges are loaded through the studded end of the module, one per chamber, and are held in place by the retaining assembly. The payload module assembly is assembled to the dispenser assembly.
4.1.5 Electronic Module Assembly (EM). The EM (Figure 4-1) contains a programmer and a cable assembly which includes a 28-volt supply receptacle and a safety switch, actuated by inserting the safety pin with streamer assembly. The programmer consists of a programming cir-cuit which allows the setting of chaff burst number, chaff burst interval, chaff salvo number, and chaff salvo interval.
4.1.6 Electronics Module Controls. Controls on the electronic module are used to program the chaff dispenser for predetermined release of chaff cartridges. Controls on the electronic module are as follows: (Refer to TM 9-1095-206-13&P)
CONTROL FUNCTION
SAFETY PIN Safety switch to accept the safety pin with streamer, placing the dispenser in a safe condition when the helicopter is on the ground.
SALVO COUNT Programs the number of salvos; 1, 2, 4, 8 or C (Continuous).
SALVO Programs the time in seconds INTERVAL between salvos; 1, 2, 3, 4, 5, 8 or R (Random 2, 5, 3, 4, 3).
BURST COUNT Programs the number of burst; 1, 2, 3, 4,6or8.
BURST Programs the time in seconds for INTERVAL burst intervals; 0.1, 0.2, 0.3 or 0.4.
4.1.7 Safety Procedures. The safety pin shall be in-stalled in the safety switch when the helicopter is parked. Safety pin is removed immediately before takeoff.
4.1.8 Operation.
1.
Counter(s) -Set for number of cartridges in payload module(s).
2.
Mode switch -MAN.
NOTE
Mode switch should always be at MAN when the ARM-SAFE switch is moved to ARM to prevent inadvertent salvo of chaff.
3.
ARM SAFE switch -ARM. ARM indicator light on.
4.
Dispense button press or mode switch PGRM, as required.
4.1.9 Stopping Procedure. ARM SAFE switch -SAFE.
4.2 RADAR SIGNAL DETECTING SET AN/APR-39A(V)1.
Refer to TM 11-5841-294-12.
4.2.1 Controls and Functions. The operating controls of the AN/APR-39A(V)1 are as follows:
CONTROL FUNCTION
POWER Controls 28VDC from the No. 1 dc primary bus.
ON Locks the switch in the ON position. System is fully operational after approximately one minute. On power up the synthetic voice will announce 9APR-39 POWER UP9. The plus (+) symbol will appear and be centered on the IP 1150A cathode ray tube (CRT) during system operation.
OFF Turns system off. Switch must be pulled to unlock and turn system off.
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