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POWER OFF/ON At ON, power is applied to
set. The switch is locked at
ON. Signals radiate after the
normal warmup period is
completed.
STBY Indicator Light
on STATUS Switch
Lights when switch is depressed
and system is in
standby operation.
Amber Warmup Caution
Light on STATUS
Switch
Lights when power is applied
to set and remains on
until operating temperatures
are reached.
FLARE TEST Switch Simulates launch command
signal to flare dispenser.
CM INOP Caution
Light (on caution panel)
When lit indicates the set
has failed and the helicopter
is without countermeasures
protection.
CM JAM Caution
Light (on caution panel)
Lights when system detects
mutual interference from
nearby countermeasures
sets or enemy jamming.
4-1-7. Normal Operation; Countermeasure Set.
WARNING
An accidental flare launch can occur when
Flare Dispenser System is armed (control
switch at ARM) and the Countermeasure
Set is operating (CM caution and indicating
lights off). A flare launch will also occur
is the FLARE TEST switch on the
countermeasures control panel is operated.
Arm these systems only in cases
where a launched flare will not cause injury
or property damage.
WARNING
During operation, the AN/ALQ-156 antennas
radiate radio-frequency energy. This
energy may cause burns to personnel
near the antennas. Be sure ground personnel
are at least 6 feet from the antennas
when the control switch is at ON.
a. Starting.
(1) MSL DET SYS circuit breakers on No. 2
PDP — Check in.
Figure 4-1-5. Countermeasures Set Control Panel (AN/ALQ-156)
TM 1-1520-240-10
4-1-8
WARNING
The system requires a 10-minute warm-up
prior to operation. To ensure automatic
system operation when required, be sure
the set is operational and all caution and
indicator lights are out prior to entering
hostile areas.
(2) POWER control switch – ON
(3) Warm-up light – ON, allow 10 minutes for
warm-up. At the end of warm-up period, the warm-up
light will be shut off.
b. ECM operation.
(1) Status switch — Push for standby operation
or release to commence automatic protection.
(2) CM JAM caution light — Check OUT.
(3) CM INOP caution light — Check OUT. If caution
light is on, the set has malfunctioned and the helicopter
is without countermeasure protection.
(4) STATUS switch – Push for standby operation
when countermeasures protection temporarily is not required
and/or accidental flare launch is a danger (LZ/PZ
operations).
(5) POWER switch – OFF when countermeasures
protection is no longer required (EOM).
WARNING
If countermeasures set has been off for
less than 5 minutes and further operation
is required, the warm–up indicator light
may go out immediately (or within some
interval less than the normal 10 minute
warmup period) after the power switch is
set to on. If this occurs, it is mandatory
that the system be operated in STBY for at
least 1 minute. Failure to observe this requirement
can result in a false alarm
(launch) and/or transmitting frequency instability
resulting in interference with other
countermeasures sets.
4-1-8. Flare Dispenser M-130.
The Flare Dispenser M-130 (fig. 4-1-6) will dispense up
to 30 decoy flares as a countermeasure to infrared seeking
missiles. The externally mounted dispenser is controlled
by a DISP CONT control panel on the console and
six firing switches. Two cockpit firing switches are provided,
one on each pilot’s control stick grip. Four handheld
crewmember firing switches are installed in the cabin
area. Flares can also be automatically fired by firing
commands from the countermeasure set (AN/ALQ-156)
if the set detects a missile approach. A timer in the cabin
provides a 2.5 second delay between firing pulses regardless
of firing switch position. A ground safety relay,
controlled by a landing gear proximity and a safety pin
manually installed into the dispenser, prevents firing
flares when the helicopter is on the ground. The system
is powered by the No. 1 DC bus through the CHAFF
circuit breaker on the No. 1 PDP.
NOTE
Although the control panel, dispenser, and
circuit breaker are marked CHAFF or have
CHAFF (C) selector positions, chaff cannot
be dispensed at this installation.
4-1-9. Dispenser Control Panel.
The DISP CONT panel is installed in the center console. The
panel contains the ARM SAFE switch, ARM indicator light,
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