LESSON 1
IDENTIFY COMPONENTS OF THE M12A1 PDDA
TASK
Identify components of the M12A1 PDDA.
CONDITIONS
Given information about and illustrations of the M12A1 PDDA, including the pump unit assembly, tank
unit assembly, personnel shower assembly, and the M2 water heater.
STANDARDS
Demonstrate competency of the task skills and knowledge by responding to the multiple-choice
examination about the components of the M12A1 PDDA, including the pump unit assembly, the tank
unit assembly, the personnel shower assembly, and the M2 water heater.
REFERENCES
TM 3-4230-209-12
TM 5-2805-259-14
Learning Event 1
DESCRIBE THE PUMP UNIT ASSEMBLY OF THE M12A1 PDDA
The complete nomenclature for the M12A1 PDDA is: decontaminating apparatus, power-driven,
skid-mounted, multipurpose, nonintegral, 500-gallon, ABC-M12A1. For brevity, in this subcourse it
will be referred to as the M12A1 PDDA.
The M12A1 PDDA consists of a pump unit assembly, a tank unit assembly with a personnel shower
assembly, and an M2 water heater. These three items are shown in Figure 1. In this learning event, the
pump unit assembly will be discussed.
PUMP UNIT ASSEMBLY
The pump unit assembly is a skid-mounted unit consisting of a frame assembly, cover panels,
gasoline engine, fuel tank, pump, plumbing, generator, control panel, battery, two discharge hoses on
two hose reels, connector panel, prime-detergent tank, exhaust pipe extensions, and cover. A toolbox,
which is used to store on-equipment material (OEM), is located between the two hose reels. A suction-
hose connector and two discharge-hose connectors are on the connector panel at the back of the pump
unit. A lifting eye with clevis is provided at each corner for picking up the pump unit assembly. The
canvas cover is provided to cover the pump unit assembly when it is not in use. The two exhaust pipe
extensions are stowed on the tank unit assembly. The extensions are attached to the exhausts of the
engine when it is operating. The pump unit assembly is shown in Figure 1.
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