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MODE
selector
SAFE Removes power from dispenser subsystem.
Selects type of chaff release.
Dispenses one chaff cartridge each time the WAS chaff fire position is toggled.
PGRM Allows setting electronic module controls before flight to automatically dispense
chaff according to predetermined number of chaff cartridges per burst and number
of salvos.
4.36.1 Dispenser Assembly. The dispenser assembly
(fig 4-20) contains the C-F (chaff-flare) selector switch,
chaff counter control, and a housing containing the sequencer
assembly. The sequencer assembly receives 28
vdc through the WAS and furnishes pulses to each of
the 30 contacts of the breech assembly, in sequential order
1 through 30, thus firing each of the chaff cartridges.
4.36.2 Remote Safety Switch. The remote safety
switch is located on the tailboom just forward of the dispenser
assembly. This switch safes the dispenser by
grounding the chaff dispenser contacts and opening the
firing circuit when the safety pin is installed in the
switch.
4.36.3 Payload Module Assembly. The payload module
assembly (fig 4-20) consists of the payload module
and the retaining plate. The payload module has 30
chambers which will accept chaff. The chaff cartridges
are loaded, one per chamber, and are held in place by
the retaining plate. The payload module assembly is
loaded into the dispenser assembly.
4.36.4 Electronic Module. The electronic module (fig
4-20) provides signals to fire the chaff and to change the
chaff counter accordingly. It contains a programmer
and a cable assembly which includes a 28 volt supply
receptacle. The programmer consists of a programming
circuit which allows the setting of chaff burst quantity,
burst interval, salvo quantity, and salvo interval. The
safety switch on the electronic module is not used. The
electronic module is located in the right aft avionics
bay.
4.36.5 Electronic Module Controls. The switches on
the electronic module (fig 4-20) are used to program the
chaff dispenser for predetermined release of chaff cartridges.
The function of each switch is described in
table 4-22.
Change 4 4-70.1/(4-70.2 blank)

WARNING
CAUTION
CAUTION
TM 1-1520-238-10
Table 4-22. Electronic Module Switch Functions
Switch Function
SALVO COUNT Programs the number of salvos: 1, 2, 4, 8, or C (continuous). A salvo is the same as one
burst.
SALVO INTERVAL Programs the time in seconds between salvos: 1, 2, 3, 4, 5, 8, or R (random timing, e.g. 2,
5,3,4,3, 2).
BURST COUNT Programs the number of chaff cartridges that are fired in one burst: 1, 2, 3, 4, 6, or 8.
BURST INTERVAL Programs the time interval in tenths of a second between individual chaff cartridge
firings within a burst: 0.1, 0.2, 0.3, or 0.4.
4.36.6 Kit Safety Procedures. The following special 1. Chaff counter - Set for number of chaff carsafety
procedures shall be followed: tridges in payload module.
2. Mode switch - MAN.
Avoid exposure to high concentrations
of chaff; this can cause temporary
irritation to eyes and throat.
Mode switch should always be in the
MAN position prior to setting the
a. Chaff and Impulse cartridges. Chaff and im- ARM/SAFE switch to ARM to prevent
pulse cartridges shall be kept away from all fires and immediate salvo of chaff.
excessively high temperatures. 3.
b. Impulse cartridges. Impulse cartridges must
be handled with extreme care. Each cartridge gener- 4.
ates extremely high gas pressure and temperature
when fired. 5.
c. Safety pin. The safety pin shall be installed in
the remote safety switch whenever the helicopter is
parked. Remove the safety pin prior to takeoff.
4.36.7 Kit Operation.
Operation is totally independent of
aircraft ARM/SAFE power.
NOTE
When power is removed from the dispenser
assembly, the firing order resets to position
No. 1 in the payload module. If payload
module is partially expended, the
payload module may be rotated 180° prior
to power up to ensure an unexpended
chamber is in the No. 1 position.
6.
ARM/SAFE switch - ARM; ARM indicator
light on.
Mode switch - PGRM -if desired or required.
Cyclic WAS - C (6:00 position) as desired to
fire chaff.
Stopping Procedure - ARM/SAFE switch -
SAFE.
4.37 RADAR WARNING SYSTEM AN/APR-39(V)1 .
The radar warning (RW) system provides visual and
aural warnings of radar reception in bands generally
associated with hostile fire control radar. Each radial
strobe displayed on the RW display represents a line of
bearing to an active radar transmission. When a radar
　
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