FCOM PER-LOD-FUL FUEL
GROUND FUEL TRANSFER
Applicable to: ALL
On cockpit overhead FUEL panel
PUMPS (of the tanks not to be defueled) OFF
MODE SEL MAN
PUMPS (of the tank to be defueled) ON
if left wing and/or center tanks is (are) to be defueled :
X FEED ON
OPEN light comes on.
On refueling control panel :
REFUEL VALVES (of tanks not to be filled) SHUT
REFUEL VALVES (of tanks to be filled) OPEN
MODE SELECT DEFUEL/XFR
OPEN light comes on.
FUEL QTY MONITOR
When the tank contents reach the required level :
Corresponding REFUEL VALVES SHUT
MODE SELECT OFF*and*GUARDED
OPEN light goes out.
REFUEL VALVES NORM*and*GUARDED
Set cockpit FUEL panel to normal configuration.
However operators operating with the LPC can simply enter the fuel loads per tank in the weight and balance module fuel tab.
There is no restriction on flying with the tip tanks empty, but obviously there is a weight and balance concern.
Also when the engines run the tip tanks will slowly fill, as the fuel that is used to cool the idg oil is recirculated into the tip tanks.