The spray system is controlled by a manual valve which is actuated by manually moving the valve control lever
fore and aft, at the copilots position, It controls the flow of the tank liquid to the spray booms,
A bypass valve (same design as control valve) is utilized to re-circulate the tank fluid back to the tank or pump
inlet. It serves to preheat fluids when desirable and to prevent foaming,
A fiberglass constructed tank reinforced with two internal baffles serves as a reservoir for the spray liquid. The
tank has a liquid quantity gauge at its forward side (applicable on serial no's 1 to 20 only), a filter strainer at the top, an
air vent and an overflow tube which permits excess fluid to spill overboard, The tank also has capacity markings on each
end and on its forward side. A twist type filler cap is located at top center of the tank to provide an alternate method of
filling. Brackets for fastening boom struts and cables are attached and located above each end, The tank is normally
filled from the bottom through a quick-disconnect fitting on the tank structure to which the tank is strapped.
A support structure, constructed primarily of aluminum extrusions and sheet metal, provides a base for the tank
and has mounts for the remainder of the system component so It is fastened to the floor of the aircraft with tie-down lugs
and straps as explained in Section 3.2.
An identification plate is located in the center of the forward upper channel of the support structure. It contains
information such as serial and model numbers.