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automatic dispensing of expendables when the AN/
ALQ-156 missile detection system senses a missile approaching
and MWS switch on the DCDU is on. Expendable
cartridges are manually dispensed using the FLARE
DISP button on the pilot’s or copilot’s cyclic grip or by
using any of the four hand-held crew dispense switches
located in the cabin at station 200 and 400 BL47 left and
right. Dispensing of expendables is inhibited when the
aircraft has weight on the wheels (WOW); safety pin in
AN/ALE-47 safety switch; squib power circuit breakers
are pulled (out). CMDS operation is as follows:
WARNING
Jettison mode will dispense flares with
mode switch in the OFF position if the
safety pin is removed from the safety
switch and landing gear proximity switch
indicates no ground contact or if the landing
gear status panel’s landing gear
switch is in bypass.
WARNING
Prior to turning on power to the system,
ensure that the safety pin is installed in the
AN/ALE-47 safety switch to prevent the inadvertent
dispensing of expendables.
NOTE
The AN/ALQ-156 should be turned on and in
standby mode prior to applying power to the
CDMS.
1. Safety pin — Installed in AN/ALE-47 safety
switch, streamer visible.
2. Set DCDU switches as follows:
a. JETTISON switch — Aft (switch guard
closed).
b. MANUAL switch — 1, 2, 3, or 4 as required.
NOTE
The CMDS takes five seconds to warm up
when turned on. No dispensing is possible
during warm-up. The system performs BIT
during power-up and displays GO or NO-GO
with a momentary illumination of the DISPENSE
READY advisory on the DCDU. The
DCDU then displays the Operational Flight
Program (OFP), followed by the Mission Data
File (MDF) version number (#XXXX), then the
number of loaded expendables (flares) is displayed.
c. MODE switch — STBY.
d. O1, O2, CH, and FL inhibit switches —
Off (Indicator light not illuminated).
e. RWR, JMR, and MWS inhibit switches
— Off (Indicator light not illuminated).
f. AN/ALE-47 lighting control potentiometer
(Misc. Control Panel) — Adjust
DCDU LED display illumination as required.
WARNING
A countermeasure dispense may be initiated
if BIT is initiated with DCDU power on,
the safety pin removed from the safety
switch, the aircraft in a weight off wheels
condition, and either squib power circuit
breaker in.
3. Observe the following on the DCDU:
a. DISPENSE READY and NO-GO lights
illuminate.
b. The four segments above each payload
enable switch illuminate all pixels.
c. The following appears in the sixteen
character display of the DCDU:
(1) Current version of the OFP and
MDF.
(2) CMDS pilot’s fault list (PFL), if a
fault has been detected.
(3) Payload inventory O1, O2, and FL
displays current inventory.
TM 1-1520-240-10
4-1-16
d. BIT checks and reports system status
in one pass if expendables are installed
in all four dispensers. If only one magazine
is installed, BIT must be initiated
each time the magazine is moved to a
different dispenser, or a new magazine
is installed.
NOTE
Faults detected during BIT are stored in the
DCDU programmer memory. NO-GO indicates
the system has detected a fault which
must be corrected prior to resuming CMDS
operation. Maintenance must be performed
to correct the fault prior to clearing the
memory.
e. To clear a fault indication from memory
after maintenance has been performed,
momentarily press ENT/BIT
switch. If no other faults are identified,
system inventory will be displayed.
4-1-25. Flight Operations.
WARNING
Missions in a threat environment require
the AN/ALE-47 Countermeasure Dispenser
System to loaded with Advanced Infrared
Counter-measures Munitions (AIRCMM)
flare combination. The dispenser is
divided into 3 zones and each zone is
loaded with 10 of the same type flares. A
correctly loaded dispenser will have an
equal number of M206, XM211 and XM212
Aircraft Countermeasure Flares. This
combination provides optimal countermeasure
capability. Deviations from this
AIRCMM flare combination will significantly
reduce countermeasure capability
and increase aircrew vulnerability to Infrared
(IR) missile threats. Aircraft shall
not be flown into threat environments with
any combination of flares other than this
AIRCMM flare solution unless authorized
by the unit commander. Failure to comply
could result in death or injury to personnel
　
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