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4-1-14.  In-Flight Operation
Figure  4-1-6.  Flare Dispenser System (Sheet 1 of 2)

TM-1-1520-240-10 Army CH-47D Heilcopter (EIC:RCD) Manual
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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.







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