Fire Boss amphibious single engine air tanker: - Department of ...

Overflow and venting
The standard 75 millimetre vent located
on the aft right side of the fire gate is
supplemented with the addition of a
new 125 millimetre vent that exits on
the right side of the rear fire gate fairing.
The original hopper vent/door has been
modified to allow for a greater venting
volume during scooping operations.
In the event of an overflow during
scooping operations, a spring loaded
relief valve door is located at the rear
of the main drop vent door located on
the top of the hopper. 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.
Fire Boss Fire Retardant
Delivery System
See AT-802 Fire Retardant Delivery
System, Page 16 for further information.
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Plate 20. Shows the
upper relief valve
door.
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Figure 1. Both images show the standard Air Tractor FRDS and the location of the fuselage supports
for the amphibious floats which appear to offer no interference to the drop evacuation process.
Plate 19. Shows the
original 75 millimetre and
new 125 millimetre fire
gate venting.
21
Fire Boss amphibious single engine air tanker: Final Report, November 2008