TM 1-1520-240-10
4-1-10
5. If the ECM set is inoperative, proceed as
follows:
NOTE
The crewmember observing a missile launch
is responsible for firing the flares.
a. Missile threat — Actuate the dispensing
switch on the cyclic grip to fire flares or
chaff or press one of the four firing
switches in the cabin to fire flares. Fire
a total of three flares or hold button
down and timer will automatically space
firing interval.
NOTE
The flare dispensers will fire one flare each
time a button is pressed following the 2.5 sec-
ond time delay or at 2.5 second intervals if the
flare dispense button is held down. If the flare
fails to ignite, a second flare will automatically
fire within 75 milliseconds. If burning is still not
detected, a third flare will be fired. If all three
flares fail to ignite, automatic operation will
stop until one of the fire switches is again
pressed.
b. Announce over interphone that a mis-
sile launch was detected and flares
have been fired.
c. If more than one missile launch is ob-
served, continue firing flares at 3-sec-
ond intervals until the helicopter is clear
of the threat.
4-1-15. Before Landing Check.
1. ARM-SAFE switch — Set to SAFE.
2. Indicator lights — Check that READY-TO-
FIRE and ARM lights are out.
4-1-16. After Landing Check.
1. Check that the LDG GR SW Status light
goes out.
2. Install the ground safety pin in the dispenser
electric module.
3. Remove and stow the crew firing switches.
4-1-17. Countermeasures Dispenser System, AN/
ALE 47. (fig. 4-1-6)
The AN/ALE-47 Countermeasures Dispenser System
(CMDS) provides the aircraft with protection from air-to-
air and surface-to-air heat seeking missiles. Modes of
operation are manual (five stored programs), semi-auto-
matic (operator/sensor activated), and automatic (opera-
tor/sensor activated). The CMDS is integrated with the
AN/ALQ-156 Missile Detection System to automatically
dispense expendables when a threat is detected by the
AN/ALQ-156 when in the AUTO or SEMI AUTO mode of
operation. The CMDS may be pre-programmed to re-
spond threat environments.
The CMDS is comprised of the following components: a
Digital Control Display Unit, (DCDU), a programmer, a
junction box, two sequencers, and four dispenser as-
semblies, each containing a payload module (maga-
zine). The system also contains a safety switch and a
Mission Load Verifier (MLV) interface port.
Power required to operate the CMDS is 28 Vdc, 2 amps
max in STANDBY and 7 amps for 20 milliseconds during
each squib ignition, is taken from the No. 1 DC Bus. The
three circuit breakers for the CMDS are found on the
EAPS 1 PDP labeled DC ALE47. Power for the DCDU is
taken through a 5 amp CB labeled DCDU. Power re-
quired to jettison expendables is taken through two 10
amp CBs labeled PWR NO. 1 SEQ and NO. 2 SEQ.
