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Figure 10-36.AN/ALE-29A countermeasures chaff dispensing set
Figure 10-40.AN/ALE-37A countermeasures chaff dispensing set

Aviation Ordinanceman 1 - Aviation theories and other practices
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When the dispensers are loaded, the safety pin or flag assemblies must remain installed until just before fight. The rear of the housing assembly has a dispenser interconnect that electrically connects the dispenser assembly to the system. When you are installing the dispenser assembly into the housing assembly, you should use a guide pin to ensure proper alignment of the electrical connectors. Sequencer Switch Two sequencer switches (fig. 10-38) are used in a system—one for the right- and left-dispenser assemblies. The sequencer switch is a solenoid- actuated, multideck, rotary stepping switch contained in a hermetically sealed case. The sequencer switch is actuated by control signals received nom the programmer. Each control signal from the programmer actuates a relay in the sequencer switch, which applies 28-volt dc to the rotary switch. As the rotary steps, a firing pulse is supplied directly from the aircraft’s 28-volt dc power supply. This firing pulse is directed to the applicable impulse cartridge in the dispenser assembly. Dispensing starts with the selection of one or both dispensers (right or left) from the cockpit and the initiation of the dispensing switch. When only one dispenser has been selected and is emptied, the programmer control pulses are. automatically transferred to the second sequencer switch. When both dispensers are selected by the cockpit control, simultaneous signals are directed to both sequencer switches. The sequencer switches are connected to the dispenser housing by an electrical cable supplied as part of the dispenser housing. Dispensing Set Programmer The dispensing set programmer (fig. 10-39) provides electronic control of the dispensing modes. The AN/ALE-39A programmer generates control signals for the programmed payload ejection sequences. It also generates control signals for single ejection of payloads initiated manually. Manual (single) dispensing is performed during a programmed dispensing sequence without disrupting the program. AN/ALE-37A COUNTERMEASURES CHAFF DISPENSING SET The AN/ALE-37A countermeasures chaff dispensing set (fig. 10-40) is externally mounted on aircraft MER/TER ejector racks that have 14-inch suspensions. When mounted on the aircraft, the AN/ALE-37A has various patterns of chaff, decoy flares, or expendable jammers. Dispensing is dependent upon control settings and aircraft speed. Several dispensing pods may be employed on a single aircraft to provide maximum countermeasure capabilities. The dispensing set is of modular construction, making maintenance easier and reducing turnaround time. Each dispensing pod contains two lightweight payload modules. Each payload module has a capacity of 120 rounds, providing a total capacity of 240 rounds. When empty, the pod weighs 180 pounds. When fully loaded, the pod weighs approximately 277 pounds. Figure 10-38.—Sequencer switch. 10-34







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