switch electrical wiring to the aircraft wiring. The
This valve uses engine bleed air as a means of
air pressure and vent shutoff valve vents the tank
pressurizing the tank and forcing fuel into the
to the atmosphere during the pressure fueling
wing tank, or tanker store. A gravity filler port
procedure. However, the valve is also used with
is provided to accomplish gravity fueling when
pressure fueling equipment is not available.
Figure 4-8.-Ejector pumps. (A) Dual seat; (B) single seat; (C) wing transfer.