Figure 4-1-7. AN/ALE-47 Countermeasures Dispenser System (CMDS)

4-1-18. Controls and Function, Countermeasures Dispenser System (AN/ALE-47)

TM-1-1520-240-10 Army CH-47D Heilcopter (EIC:RCD) Manual
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TM 1-1520-240-10 4-1-14 Figure 4-1-7. AN/ALE-47 Countermeasures Dispenser System (CMDS) 4-1-19. The AN/ALE-47 Programmer. The AN/ALE-47 programmer, located at STA 355 in the left side of the cabin, is the central processing unit for the CMDS and provides the interface between the DCDU and the four flare dispensers via two sequencers. The programmer receives input data from the AN/ALQ-156 missile detection system, processes it to determine the appropriate dispense response, and sends fire com- mands to the sequencers when CMDS is in Auto or Semi Auto mode of operation. The software program within the programmer that man- ages all communications, operations, and calculations is called the Operational Flight Program (OFP). The pro- grammer also contains the Mission Data File (MDF) which is user-programmable and contains data elements that enable the CMDS to be configured to specific pay- load types, dispense sequence, and dispense quantities. The OFP and MDF are loaded into the programmer using Mission Load Verifier (MLV) via the MLV interface port located in the cabin at station 359 overhead. 4-1-20. AN/ALE-47 Sequencers. There are two AN/ALE-47 sequencers installed in the aft cabin at station 547 buttline (BL)40L and station 543 BL40R. The sequencers receive payload type and fire commands from the programmer over the Sequencer Data Link (SDL). The sequencers select the dispenser with the appropriate payload and send high power im- pulses to the dispenser(s) and magazine to dispense the programmed expendable. The sequencers also detect magazine type, monitor the remaining inventories in the magazines, and detect payload misfires. This informa- tion is sent to the programmer via the SDL. Each se- quencer also performs internal BIT. Sequencer NO. 1 controls the two dispensers (1 and 3) on the LH side of the aircraft, and sequencer NO. 2 controls two dispens- ers (2 and 4) on the RH side of the aircraft. 4-1-21. AN/ALE-47 Safety Switch. A safety switch located at station 518 BL50L is installed in the CMDS to provide a safeguard against inadvertent dispensing of expendable. When the safety pin is installed in the safety switch, squib power (28 Vdc) to the sequencers is interrupted, inhibiting dispensing expen- dables. The safety switch provides ground to the AN/ ALE-47 squib power relay (located in the AN/ALE-47 junction box at station 410 BL22.5L) when safety pin is removed allowing squib power to the sequencers for dis- pensing expendables. 4-1-22. Dispenser Assemblies. Four flare dispenser assemblies are mounted in pairs on the LH and RH sides of the aft fuselage. Each dispenser assembly consists of a housing and a breech plate. The breech plate provides interface for the payload module and routes firing and polling pulses from the sequencers to the payload squibs. 4-1-23. Payload Module Assemblies. The payload module assemblies are mounted on the dispenser assemblies. Each payload module assembly consists of a payload module (magazine), and an EMI (HERO) gasket/breech plate. The payload modules can hold up to 30 expendable cartridges which are loaded and installed in the dispenser assemblies prior to the mission. The payload modules are capable of being loaded with 3 types of expendables; XM211, XM212 and M206. They use either the M796 or BBU-35/B cartridge.

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