o) On/off station for pumps, if pumps are dedicated
to fill stand. Provide a light to indicate on/off status.
p) Emergency fuel shutoff stations. For
with multiple positions, an emergency fuel shutoff
not be required for each position. Design in such
that activation of the emergency stop will shutoff
at that pump house.
q) Grounding reel (if bonding through an automatic
high-level cutoff system is not provided).
r) Strainer with differential pressure gauge on a
configuration where a filter/separator is not provided at the
s) Pressure gauge.
t) Maintenance drains.
v) Surge arrestors (if required).
w) Meter-proving connections, unless local procedure
provides an alternative.
Aircraft Direct Fueling Systems. Direct fueling
aircraft and require additional fueling hardware, such as a
hydrant hose truck, pantograph, or hydrant hose cart. These
may be hydrant systems for portable pantograph connections or
hard pipe with fixed pantographs, which is usually the case
for in-shelter fueling and hot fueling stations. While
individual components may vary slightly between the various
aircraft fueling systems, the basic philosophy followed by all
the services is the same. The systems are configured in a
loop with no dead ends. The loop is made up of the
supply/return piping separated by a flushing/back-pressure
control valve that maintains a constant pressure on the supply
side piping and relieves excess fuel not taken on by the
aircraft(s) into the return portion of the piping and back to
the tank. The lead pump is turned on either automatically by
a drop in the system pressure or manually by an on/off switch
at each direct fueling station. A venturi in the supply