Section II. EQUIPMENT DESCRIPTION AND DATA
The PDU is slung from the bottom of a helicopter and is compatible with any utility helicopter that has a cargo hook. The
PDU's self-contained power source is electrically and mechanically independent of the helicopter. The PDU can be
jettisoned in an emergency and requires no helicopter modifications. Remote control operation allows dispersal of solid
or liquid pesticides from the helicopter operator's compartment. Depending upon equipment configuration, liquid
pesticides can be dispersed using the low volume (LV) system for sparse landscape or by using the ultra-low volume
(ULV) system when covering dense foliage. The solid dispersal (SD) system uses a slinger assembly to disperse solid-
type pesticides. The characteristics, capabilities, and features of the PDU are listed below.
(1) Dispersal of liquid pesticides (LV or ULV systems)
(2) Dispersal of solid pesticides (SD system)
b. Capabilities and Features.
(1) Hand control for operation from helicopter
(2) Tail fin provides for stable flight attitude
(3) Quick disconnect for emergency release (jettison) from helicopter
(4) Close coupled to helicopter utilizing a single lifting strap
(5) Totally enclosed SD system
(6) Self-contained power source independent of helicopter
(7) Can be used on any helicopter with a cargo hook, without modification
The major components of the PDU are described below. Refer to figure 1-1 for location.
BUCKET ASSEMBLY (1) - Fiberglass hopper that holds solid or liquid pesticide. Support frame provides for
mounting of engine, gas tank assembly, pump, and hydraulic reservoir.
HAND CONTROL ASSEMBLY (2) - Allows operator to operate PDU from either inside or outside of helicopter.
HYDRAULIC RESERVOIR (3) - Provides supply of hydraulic fluid for system.
GAS TANK (4) - Provides fuel for engine.
ENGINE (5) - Provides power to drive main hydraulic pump.