SERVICE MANUAL & ICA
10000 AMPHIBIAN FLOATS ON AIR TRACTOR AT-802A
Page 14
Revision U
P/N 1002545
When auto is selected, the pilot may select how many gallons he wants to scoop by rotating the fill level selector
knob located to the right side of the hopper quantity and fill level readout window (hopper quantity is on the top
reading and the selected fill level is on the bottom).
When the quantity reads approximately 255 gallons the hopper empty (the scale starts at that number) with auto
selected, the scoops will go down when the rocker switch is depressed and move back up automatically when
the quantity selected is reached (with the rocker switch still depressed). If the rocker switch is released before the
quantity is reached, the scoops will move back up.
If the pilot wants to abort the scoop operation once it is initiated, simply releasing the rocker switch will put the
scoops back up, such as in an emergency or other unplanned occurrence. Scoop up and scoop down lights are
provided that indicate scoop position via a pressure switch that illuminates the lights. The scoop lights (2) can be
tested utilizing the test switch on the left side of the glare shield panel.
1.5 FOAM SYSTEM
The Wipaire 802A Fire Boss foam system consists of three individual tanks. The original 18-gallon firewall tank is
supplemented by an additional 30 U.S. gallon tank in each float (at sta +1) of which approximately 28 U.S. gallons
is usable in the automatic mode. In the manual mode all 30 gallons are usable. A total of approximately 74 U. S.
gallons can be delivered to the hopper (in the automatic mode) utilizing the foam control panel located on the left
side of the cockpit just below the fire gate computer. In the manual mode, a total of 78 gallons can be delivered
to the hopper. The float tanks are optional and one or both can be removed depending on the type of operation.
(Tank and floor 50 lbs at +1.0 each float)
To use fluid stored in the float tanks, it is necessary to pump fluid from the float tank to the fuselage firewall tank.
This transfer can be accomplished manually or automatically by selecting the appropriate position with the left and
right foam control switches located on the glare shield panel. When manual “on” is selected, fluid will be pumped
via the electric pump located on the top of the tank to the firewall tank.
The pump does not shut off when the tank is full. In the event of an over flow, fluid would come out of the firewall
tank vent fitting located just aft of the front left float strut.
When auto is selected, the float tank transfer pump will come on at approximately 7 gallons of fluid remaining in
the fuselage tank. It will shut off automatically when the fuselage tank is approximately 2/3 full or whenever the
selected float tank has about 2 gallons remaining.
The left and right transfer systems can be used individually or simultaneously as desired. Whenever a foam
transfer pump is operating, the appropriate green Pump On light will illuminate (manual or auto). The Pump On
lights can be tested utilizing the test switch on the left side of the glare shield panel.
1.6 VENT AND OVERFLOW PROTECTION
The original 802-hopper vent/door has been modified to allow for a greater venting volume during scooping
operations. The original 3-inch Air Tractor vent located on the aft right side of the fire gate is supplemented with
the addition of a 5-inch vent that exits at the right aft side of the rear fire gate fairing. In the event of an overflow
during scoop operations, a spring loaded relief valve door is located directly aft of the main drop vent door. Water
will exit the hopper to the right and forward of the cockpit windshield. The pilot can see ahead out of the left side
of the windshield during an overflow condition.
The door spring needs approximately 40 pounds of pressure to open. To check this, use a hand held spring type
scale. Locate scale to the center of door on outside edge.