AIRPLANE
OPERATIONS
MANUAL
FUEL
REVISION 38
2-08-10
Page
1
Code
01
AOM-145/1114
REFUELING AND DEFUELING
Refueling and defueling operations may be performed either by
pressure or by gravity. The refueling panel in the right wing-to-fuselage
fairing allows pressurized refueling/defueling operation. A gravity filler
cap on the upper skin of each wing allows gravity filling. Dump valves
and drain valves are used for gravity defueling.
PRESSURIZED REFUELING
Pressurized refueling operations require the refueling system being
energized. This can be accomplished by either energizing the airplane
through APU, GPU, battery or running engine, selecting the power
selection switch to BATTERY.
As fuel pressure is applied on the adapter the two CLOSED lights will
illuminate to indicate that refueling shutoff valves are closed. Selecting
the refueling switch to OPEN will open the shutoff valves, starting
refueling operation. The shutoff valves will close, stopping the
refueling operation, when:
− The fuel level in the tanks lifts the associated pilot valve’s float. This
level defines the maximum fuel volume approved for that tank,
through pressure refueling.
− The selected fuel quantity on the refueling panel is achieved.
− The refueling switch is commanded to closed.
For airplanes with High Level Exceeding Indication System
incorporated, an automatic refueling shutoff failure will be identified by
the HLEIS (High Level Exceeding Indication System), that will sense,
via one HLS (High Level Sensor) in each wing tank, that the fuel level
in the failed tank reached over the maximum quantity approved for that
tank and will advise the operator by illuminating, on the refueling
panel, the “STOP RFL” red indicating light of the failed tank. The
operator shall interrupt the refueling operation immediately, after
viewing the red light on, to prevent fuel spillage through the vent valve
and shall call the maintenance personnel to follow the procedure to
remove the extra fuel of the associated tank(s).
The fueling cart or fueling truck shall deliver a refueling pressure
(deadhead) within 35 to 50 psi.
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