tects less than 350 pounds of fuel in the re-
spective wing tank.
On the fuel system schematic (Figure 5-6),
when the respective wing tank quantity is less
than 350 pounds, the analog pointer and dig-
ital readout turns amber. The digital display
is also boxed in amber. Invalid fuel signals are
displayed as amber dashes.
NOTE: The “L R FUEL QTY LOW” caution
CAS message and indication is only func-
tional on aircraft 45-195 and subsequent and
prior aircraft modufied by SB 45-28-5.
FUEL TRANSFER SYSTEM
FUEL CONTROL PANEL
The engine/fuel control panel (Figure 5-7) is
located on the center console, aft of the throt-
tle quadrant. The fuel control panel contains
left and right standby pump switches, a cross-
flow switch, and a totalizer reset pushbutton.
The standby pump switches annunciate ON
when electrical power is being provided to
the corresponding standby pump. The cross-
flow switch (XFLOW) contains a horizontal
bar which illuminates when the crossflow
valve is in the open position, or is not fully
closed. Pump and valve status is also annun-
ciated on the CAS. See Table 5-1.
CROSSFLOW VALVE
The two wing tanks are joined to each other
by a crossflow line that connects the output
side of the two standby pumps via a motor
driven crossflow valve (Figure 5-8). The
pumps are vane type and fuel can flow in re-
verse through the pumps if they are not oper-
ating. The crossflow valve is normally closed
during flight, but may be opened should a fuel
imbalance occur. Fuel can gravity flow be-
tween wing tanks when the crossflow valve is
open or it can be pumped from one wing to the
other using either standby pump. Selection of
the crossflow valve switch (XFLOW) and the
left standby pump switch (L STBY) (Figure
5-8), for example, causes the crossflow valve
to open and the left standby pump to run. This
operation would cause fuel to be transferred
from the left wing to the right wing at ap-
proximately 50 pounds per minute. Operation
of the right standby pump with the crossflow
valve open would, conversely, move fuel from
the right wing to the left wing.
When the crossflow valve is selected open
with the XFLOW switch, the white bar on the
switch will illuminate when the valve reaches
the full open position. When the valve is
closed, the white bar will be extinguished.
The CAS presents a white “FUEL XFLO
OPEN” message on the EICAS when the cross-
flow valve is in the open position. If the valve
does not go full to the position selected on the
switch within 1.5 seconds, the CAS will alert
L E A R J E T 4 5
P I L O T T R A I N I N G M A N U A L
FlightSafety
international
5-11
FOR TRAINING PURPOSES ONLY
FUEL
L STBY
R STBY
XFLOW
FUEL USED RESET
ON
ARM
APR
EDS RECORD
ENG SYNC
N1
N2
OFF
L START
L IGN
OFF
ON
L ENG CMPTR
M
A
N
FIRE
#1
#2
EXTINGUISHER
L ENGINE
#2
#1
EXTINGUISHER
FIRE
R START
R IGN
OFF
ON
R ENG CMPTR
M
A
N
R ENGINE
ARMED
ARMED
ARMED
ARMED
FIRE
PUSH
CLOSED
FIRE
PUSH
CLOSED
ON
ON
ON
ON
ON
Figure 5-7. Engine/Fuel Control Panel