TM 5-3740-218-13&PSection III. TECHNICAL PRINCIPLES OF OPERATION1-14.FUNCTIONAL DESCRIPTIONa.The PDU is used in three configurations: LV liquid spray, ULV liquid spray, and SD solid particle. Duringoperation, the PDU is suspended from a helicopter by a lifting strap. All configurations consist of a bucketcontaining the pesticide, a gasoline-powered engine, and a hydraulic pump. In the LV configuration, liquidpesticide is pumped by a hydraulic motor-driven centrifugal pump from the bucket to boom spray nozzles. Inthe ULV configuration, liquid pesticide is pumped by the centrifugal pump from the bucket to boom rotaryatomizers. The rotary atomizers are hydraulically driven. In the SD configuration, solid-particle pesticide dropsfrom the bucket to the slinger, where it is dispersed by hydraulic motor-driven vanes.b.The hand control (figure 1-2) operates the PDU from inside the helicopter. When the POWER switch is in theON position, battery power is applied to the engine. When the ENGINE START switch is positioned to STARTand held, the starter is engaged to start the engine. After the engine is running, the ENGINE START switchshould be released and the switch will spring to the run position. Pressing the DISPERSAL pushbutton willrelease the pesticide.Figure 1-2. Hand Control Assembly1-9
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