MD-11 Flight Crew Operations Manual
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Fuel -
Description and Operation
Fuel.10.10
• CRTs for display.
• Air data computers.
The refueling panel sends preselect fuel quantities to the electronic module during
refueling.
The FQGS self-tests before each flight and after refueling.
Refueling and Defueling
The aircraft is refueled through four pressure refueling adapters (fuel entry
valves), two on each wing. Each tank can be selectively pressure fueled to any
desired quantity through any or all four fill adapters. There are no gravity fillers.
The horizontal stabilizer must be at 3 degrees Aircraft Nose Up (ANU) to
completely refuel the tail tank. For convenience, on the right side of the aft
fuselage there is a line on the fuselage and on the stabilizer that will line up when
the stabilizer is at 3 degrees ANU. The left side of the aft fuselage has markings
that indicate the neutral position (0 degrees ANU) that are not for refueling.
The right wing control panel provides refueling control without the necessity of
personnel in the cockpit. Power (dc) is supplied to this control panel through the
control panel access door switch and the ARM switch on the panel. Both switches
must be closed for the right wing control panel to be energized. The access door
switch is closed when the door is open and the toggle switch is closed by the
refueling operator.
Energizing the fueling system by actuation of the refuel switch at the wing control
panel energizes a relay that assures that the crossfeed valves are energized closed.
If a crossfeed valve switch in the cockpit is in the open position, a crossfeed
DISAG light on the FUEL control panel will be illuminated until the refueling
system is de-energized and the valve returns to the open position.
The refueling/fueling operation will be automatically stopped prior to the overfill
level being reached.
The tail tank float switch has an additional function. When tripped, it will cause
fuel flow into the tank to stop. The float switch is located low enough in the vent
box so that if the fill valve fails, the isolation valve will close before a fuel spill
occurs.
While refueling is in progress the FSC stops all functions except for APU support,
engine support, and a limited number of system checks that are not related to
fueling. The REFUELING alert will be displayed.
October 02, 2006
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