TM  1-1520-240-10            4-1-15 4-1-24.  Normal Operation. WARNING Keep all expendables impulse cartridges (located  inside  the  base  of  the  expend- able), away from fire and high temperatu- res. Each cartridge generates an extreme- ly  high  gas  pressure  and  temperature  if accidentally    fired.    Impulse    cartridges must be handled with extreme care or inju- ry to personnel could result. Ensure    safety    pin    with    streamer    is installed in the safety switch when the he- licopter is parked to prevent accidental fir- ing of expendables, possibly resulting in injury  to  personnel.  Remove  safety  pin only to perform authorized tests or imme- diately before takeoff. The CMDS is capable of automatic or manual dispensing of expendables. Selecting SEMI or AUTO mode enables automatic  dispensing  of  expendables  when  the  AN/ ALQ-156 missile detection system senses a missile ap- proaching and MWS switch on the DCDU is on. Expend- able 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 land- ing   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 in- advertent 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 re- quired. 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  DIS- PENSE 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 dis- played. 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 potentiome- ter   (Misc.   Control   Panel)   —   Adjust DCDU LED display illumination as re- quired. WARNING A countermeasure dispense may be initi- ated 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  pay- load 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.