Learjet 60 - FILL Switch; Fuselage Tank Full Light; Fuselage Tank Switch Priority

Learjet 60
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Pilot's
Manual
FILL SWITCH
The FILL switch, on
the fuel control panel, is used to operate the fuse-
lage tank
fill system . The switch is an alternate action type and must
be held
approximately
3 seconds
to select the FILL function . When
FILL is selected, both wing tank
standby pumps are energized, both
left and right transfer valves are opened
via the fuselage tank float
switch, and the crossflow valve will open
. Fuel will then be pumped
into the fuselage tank from the wing tanks
until the switch is turned
Off or the fuselage tank float switch actuates
to close the transfer
valves, shut down the standby pumps, and illuminate
the FULL light .
Placing the switch
in the Off position will extinguish the
FULL light
and close the crossflow
valve
.
The green FUEL SYS light and an ON
annunciation (on the
switch) will illuminate whenever fuselage tank
fill is selected . If FILL is
selected and the left wing float switch trips
the LOW FUEL
light or the squat switch goes to the
air mode, the fu-
selage tank fill
function will be automatically deselected .
The FILL
function
may
be subsequently
reselected, if desired .
FUSELAGE TANK SWITCH
PRIORITY
The
FUSELAGE Tank switches are listed
below in their order of prior-
ity
(highest to lowest) . If the FUSELAGE
Tank switches are posi-
tioned
to
contradictory positions, the function
with the highest priori-
ty
will override conflicting functions .
1 . NORM XFR
and AUX XFR switches (both
have the same priority)
2 . FILL
switch
3 .
GRVTY XFR switch
FUSELAGE TANK FULL LIGHT
The FUSELAGE
FULL light, on the fuel
control panel, is installed
to
indicate a
fuselage tank full condition
during fuselage tank fill opera-
tions . The
light is illuminated through
actuation of the fuselage
tank
float switch .
During normal fuselage tank
fill operations, actuation
of
the float
switch will illuminate the FULL
light, close the
transfer
valves,
and shut down the standby pumps .
The FILL switch must
be
set to
Off
to
extinguish the light .
PM-123
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Original