Learjet 60 - Fuel Control Panel Switches and Annunciators; JET PUMP Switches; STBY PUMP Switches; XFLO VALVE Switch

Learjet 60

Pilot's Manual
FUEL CONTROL PANEL SWITCHES AND ANNUNCIATORS
The
fuel control
panel (Figure 2-7)
incorporates
all
the necessary
switches to fuel the aircraft (when
using
the over-the-wing method)
and to
maintain
proper fuel management .
JET PUMP SWITCHES
The JET
PUMP switches, on the fuel control
panel,
control the motive
flow valves .
The
switches are an alternate action type . Selecting
On,
opens the corresponding motive flow valve and allows
high-pressure
fuel
from
the corresponding
engine-driven
fuel
pump
to flow to the
corresponding jet pumps . Selecting
OFF,
closes the corresponding mo-
tive flow valve and renders the associated jet pumps inoperative . When
OFF
is selected, an
OFF
annunciation
(on
the switch)
will illuminate
and the Master CAUT
lights will flash
(Master CAUT
will
not
illumi-
nate
during engine
start) .
If
a motive flow valve is
neither
open
nor
closed, the corresponding
OFF
annunciator
will flash . The
motive flow
valves operate on 28 VDC supplied through the 5-amp
L
and
R JET
PUMP-XFR VALVE
circuit breakers on the pilot's and copilot's circuit
breaker panels . Loss of power to the motive flow valve causes the valve
to
remain in
its last position
.
Motive flow valves are operative
during
EMER
BUS mode .
STBY PUMP SWITCHES
The STBY
PUMP switches, on the fuel control
panel,
control the opera-
tion of the standby electric pumps .
The
switches are an alternate action
type .
The
switches
normally remain Off
except
in
the event of a jet
pump
failure
or
during
fuel crossflow . Regardless of switch
position,
the standby pumps are automatically de-energized
during
fuselage
fuel transfer operations .
The
standby pumps are automatically
ener-
gized
when the fuselage tank
FILL
function is selected or the
START-
GEN switch is set to
START . An
ON annunciation
(on
the switch)
will
illuminate
whenever power is applied to the corresponding standby
pump
. The
green
FUEL
SYS
light,
on the glareshield annunciator
panel,
will
also
illuminate
whenever a standby pump is on
. The
standby
pumps operate on 28 VDC supplied through the 15-amp
L
and
R STBY
SCAV PUMP circuit breakers on the pilot's and copilot's circuit breaker
panels .
XFLO VALVE SWITCH
The XFLOVALVE
switch, on the fuel control
panel,
controls the
crossflow valve .
The
switch is an alternate action type . Selecting
PM-123
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2-29
Change 5