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Inautomatic mode,theFSC controls thecrossflow operation. Ifthe computerdetects a fuelimbalance between thewingtanks of200lbs (90kg), thecrossflow/APUpumpis activatedautomaticallyandthe required crossflow shutoff valve is openedto correctthe fuelimbalance. Crossflow operations continue until50lb(23kg)imbalance is reached.
Flight Crew Operating Manual MASTER
CSP A-
013
FUEL SYSTEM Fuel Management Vol. 1 13-
30-
2
REV 56, Jan 31/03
The flight crew can overridetheautomatic function byselectingtheXFLOW, AUTO OVERRIDE switchlightandthe required (L or R)XFLOW valve switchlight ontheFuel ControlPanel.
Ifthe powered crossflowsystemfails,the flight crewcan selectthe GRAVITYXFLOW switchlight ontheFuelControlPanel. This willopenthegravity shutoff valve toallow fueltransferbygravitybetween wingtanks. Gravity crossflow can also beenhancedby using asideslip maneuver.
Flight Crew Operating Manual MASTER
CSP A-
013
FUEL SYSTEM Vol. 1 13-
30-
3
Fuel Management REV 56, Jan 31/03
REFUEL/
REFUEL/
DEFUEL
DEFUEL
TRANSFER
SHUTOFF
EJECTOR ADAPTER REFUEL/
Fuel System Schematic ---General
Figure 13---30---1
Flight Crew Operating Manual MASTER
CSP A-
013
FUEL SYSTEM Fuel Management Vol. 1 13-
30-
4
REV 56, Jan 31/03
GRAVITY/XFLOW X switch/light
Pressedin -
Opensthe balance lineSOV, OPENlight comes on.
Pressedout -
Closes the balance lineSOV, OPENlight goes out.
FAILlight comes on to indicate that the balance lineSOV is not inthe commandedposition.
AUTO OVERRIDE switch/light
Pressedin -
Crossflow/APUpump
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