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either automatic or manual mode.
In automatic mode, the FSC controls the crossflow operation. If the computer detects a
fuel imbalance between the wing tanks of 200 lbs (90 kg), the crossflow/APU pump is
activated automatically and the required crossflow shutoff valve is opened to correct the
fuel imbalance. Crossflow operations continue until 50 lb (23kg) imbalance is reached.
REV 56, Jan 31/03
Vol. 1 13--30--2
FUEL SYSTEM
Fuel Management
Flight Crew Operating Manual MASTER
CSP A--013
The flight crew can override the automatic function by selecting the XFLOW, AUTO
OVERRIDE switchlight and the required (L or R) XFLOW valve switchlight on the Fuel
Control Panel.
If the powered crossflow system fails, the flight crew can select the GRAVITY XFLOW
switchlight on the Fuel Control Panel. This will open the gravity shutoff valve to allow
fuel transfer by gravity between wing tanks. Gravity crossflow can also be enhanced by
using a sideslip maneuver.
Vol. 1 13--30--3
REV 56, Jan 31/03
FUEL SYSTEM
Fuel Management
Flight Crew Operating Manual
CSP A--013
MASTER
Fuel System Schematic --- General
Figure 13---30---1
REFUEL/
DEFUEL
SHUTOFF
VALVES
REFUEL/
DEFUEL
ADAPTER
MAIN
EJECTOR
PUMP
LEFT
BOOST
PUMP
APU
LH ENGINE
FUEL FEED
SOV
XFLOW/APU
PUMP
FUEL
FILTER
NEGATIVE ”G”
RELIEF
VALVE
TRANSFER
EJECTOR
PUMP
X--FLOW
SOV
GRAVITY
X--FLOW
VALVE
TRANSFER
SOV
TO
ENGINE
P
SWITCH
COLLECTOR
TANK
MOTIVE
FLOW
REFUEL/
DEFUEL
SHUTOFF
VALVE
REV 56, Jan 31/03
Vol. 1 13--30--4
FUEL SYSTEM
Fuel Management
Flight Crew Operating Manual MASTER
CSP A--013
Fuel Control Panel --- General
Figure 13---30---2
Fuel Control Panel
Overhead Panel
AUTO OVERRIDE switch/light
Pressed in -- Crossflow/APU pump
is armed for manual crossflow,
automatic crossflow is disabled.
MANUAL light goes on.
Pressed out -- Crossflow/APU pump
is disarmed for manual crossflow,
automatic crossflow is enabled.
MANUAL light goes out.
GRAVITY/XFLOW X
switch/light
Pressed in -- Opens the balance
line SOV, OPEN light comes on.
Pressed out -- Closes the balance
line SOV, OPEN light goes out.
FAIL light comes on to indicate
that the balance line SOV is not
in the commanded position.
L/R XFLOW switch/lights
(With AUTO OVERRIDE switch/light
pressed in, manual mode.)
Pressed in -- Respective crossflow SOV
opens and crossflow/APU pump goes on,
ON light comes on.
Pressed out -- Respective crossflow SOV
closes and crossflow/APU pump goes off,
ON light goes out.
(With AUTO OVERRIDE switch/light
pressed out, automatic mode.)
ON light comes on to indicate that the
respective SOV is open and the
crossflow/APU pump is on.
FAIL light comes on to indicate that
the respective crossflow SOV is not
in the commanded position or the
crossflow/APU pump fails to go
on with the left or right crossflow SOV
selected open either manually
or automatically.
Vol. 1 13--30--5
REV 56, Jan 31/03
FUEL SYSTEM
Fuel Management
Flight Crew Operating Manual
CSP A--013
MASTER
Fuel System EICAS Indications <MST>
Figure 13---30---3
GRAV XFLOW OPEN
advisory (green)
Comes on to indicate
that the gravity
crossflow SOV is open
L, R AUTO XFLOW ON
status (white)
Comes on to indicate
that the automatic fuel
crossflow is operating
to the respective side.
MAN XFLOW
status (white)
Comes on to indicate
that manual crossflow
has been selected.
AUTO XFLOW INHB
status (white)
Comes on to indicate
that autobalance fuel
crossflow is inhibited.
L, R XFLOW ON
status (white)
Comes on to indicate
that the respective
crossflow SOV is
manually selected
open.
GRAV XFLOW FAIL
status (white)
Comes on to indicate
that the gravity
crossflow SOV has
failed.
XFLOW/APU PUMP
caution (amber)
Comes on to indicate
that the crossflow/APU
pump has failed.
L, R XFER SOV
caution (amber)
Comes on to indicate
that respective power
transfer SOV has failed.
L, R XFLOW SOV
caution (amber)
Comes on to indicate
that respective crossflow
SOV has failed.
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