THRUSH AIRCRAFT, INC – MODEL S2RHG-T65 TURBO THRUSH
AIRCRAFT MAINTENANCE MANUAL
9-2
Effective: 05/05/04
DISPERSAL SYSTEMS
GENERAL DESCRIPTION
A reinforced fiberglass hopper is the principal part of both the solid and spray units. The
hopper top forms the cowling from the cockpit forward to the firewall. The hopper gate
box is designed to be liquid as well as dust tight. Emergency jettison controls permit the
entire liquid load to be dumped in approximately 7 seconds for the 550 gal. Hoppers.
The dispersal system has been designed to handle a wide range of dispersal equipment,
and to allow for a quick, easy changeover from one type of equipment to another. All
dispersal plumbing is externally mounted and equipped with quick-disconnects to allow
for ease of maintenance and cleaning. The streamlined aluminum extrusion spray booms
are located below the wing trailing edge and utilize the downwash from the wing to
increase penetration (See Figure 9-6). The booms are fitted with spraying system
diaphragm type nozzles and normally will use 35 nozzles for low volume output and 70
nozzles for high volume output. In addition, the spray booms have large end plugs that
can be removed to aid in flushing the system.
The spray pump is located under the fuselage between the main landing gear struts. A
three-way suck-back spray valve located at the left, underside of the fuselage, controls
the spray pressure and flow. The valve is actuated from the cockpit to obtain the desired
operating pressures for various spray applications. Spray pressure is indicated by a
gauge mounted on the upper instrument panel and is controlled by a vernier adjustment
on the liquid spray-operating handle. The spray pump is a wind-driven fan type, and is
controlled from the cockpit by means of a cable to adjust the fan blade pitch to increase or
decrease pump pressure.
HOPPER
(See Figure 9-2)
HOPPER CARE
Regardless of the materials used in the construction or coating of the hopper, it should be
thoroughly washed after each day’s work. Use cold, clean water and any domestic
detergent. Inspect the interior of the hopper daily, for evidence of chemical attack, such
as surface roughness or deterioration of the resin. Look for cracks that may have started
in the areas of highest stress, such as attach points and stiffener center portions. Repairs
may then be made at the beginning of the problem, rather than after it has progressed to
a serious degree.
* NOTE *
After washing, it is very important that the door and gate be
left open for good ventilation and complete drying. It is good
practice to rinse the hopper with cold water after use with
chemicals, even if the idle period ahead is going to be only a
few hours.
Содержание S2RHG-T65 TURBO THRUSH
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