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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 second
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 missile
launch was detected and flares
have been fired.
c. If more than one missile launch is observed,
continue firing flares at 3-second
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-TOFIRE
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-toair
and surface-to-air heat seeking missiles. Modes of
operation are manual (five stored programs), semi-automatic
(operator/sensor activated), and automatic (operator/
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 respond
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 assemblies,
each containing a payload module (magazine).
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 required
to jettison expendables is taken through two 10
amp CBs labeled PWR NO. 1 SEQ and NO. 2 SEQ.
TM 1-1520-240-10
4-1-11
Figure 4-1-6. Flare Dispenser System (Sheet 1 of 2)
TM 1-1520-240-10
4-1-12
Figure 4-1-6. ALE 47 Flare Dispenser System (Sheet 2 of 2)
TM 1-1520-240-10
4-1-13
4-1-18. Controls and Function, Countermeasures
Dispenser System (AN/ALE-47 (fig. 4-1-6)
CONTROLS/
INDICATOR
FUNCTION
DCDU:
MODE Switch
OFF Off mode. Remove power
from DCDU. All functions disabled
except Jettison.
STBY Standby mode. Applies power
to DCDU to enable BIT,
reprogramming, inventory,
and jettison.
MAN Manual mode. Enables
manual dispensing of expendables.
SEMI Semi-automatic mode. Enables
manual dispensing of
expendables and automatic
dispensing when threat has
been detected by the
ALQ-156 without operator
action.
AUTO Automatic mode. Enables
manual dispensing of expendables
and automatic
dispensing when threat has
been detected by the
ALQ-156 without operator
action.
BYP Bypass mode. Expendables
dispensed directly by pilot or
copilot using cyclic grip
FLARE DISP switches, bypassing
the programmed
values stored in the Missile
Data File.
MANUAL Switch
1, 2, 3, 4 Selects one of four manual
dispense programs for use
when MODE switch is in
MAN.
PRG Program mode. Enables
manual dispensing of expendables.
JETTISON switch
Forward (on) Dispenses all expendables
with safety switch removed if
weight off wheels.
CONTROLS/
INDICATOR
FUNCTION
AFT (off) Jettison function deactivated.
Dispense Annunciator:
Displays status
READY/NO-GO
Input sensor enable/inhibit switches:
RWR Not used.
MWS Enables/inhibits missile
detection system sensor dispense
input.
JMR Not used.
Input sensor inhibit indicators:
RWR Not used.
MWS Indicates missile detection
system sensor input has
been inhibited.
JMR Not used.
Payload enable/inhibit switches:
01 Enables/inhibits payload 01.
02 Enables/inhibits payload 02.
　
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