Learjet 60 - NORM XFR Switch

Pilot's
Manual

Learjet 60
Open, opens
the crossflow valve allowing
fuel
to
flow between the
wing tanks . Whenever
the crossflow valve is open,
a horizontal bar
(on
the switch) will
illuminate to annunciate the valve's
open status .
The
green FUEL SYS
light will also illuminate
whenever the crossflow
valve is fully
opened . If the crossflow
valve is neither open nor
closed,
the horizontal
bar will flash . The crossflow
valve is opened au-
tomatically when
filling the fuselage tank from the
wings and during
fuselage
fuel transfer
operations . To balance wing
fuel, the XFLO
VALVE
switch should be
set to Open and the heavy
side STBY PUMP
switch
set to ON .
The standby pump
on the light side should be OFF
.
The standby pump
will continue
to operate until the STBY
PUMP
switch is set
to Off . The
crossflow valve allows all usable wing
fuel
aboard the
aircraft to be
available to either engine . The switch
should
be set to
Off except when correcting
an out-of-balance condition
. The
crossflow
valve operates on
28 VDC supplied through
the 5-amp
XFLO
VALVE circuit
breaker on the pilot's
circuit breaker panel . Loss
of
power to the crossflow
valve causes
the valve to remain in its last
position . The crossflow
valve is operative during
EMER BUSmode .
NORM
XFR SWITCH
The NORM
XFR switch, on the fuel
control panel, is used to
operate
the normal
(left) fuel transfer system .
The switch is an alternate
action
type . When
NORM XFR is selected,
the left transfer pump is
ener-
gized, the
left transfer valve will
open, both standby pumps will be
rendered
inoperative, and the
crossflow valve will open . Fuel
will
then
be pumped from the
fuselage tank to the wing tanks
until the
wing
float switches actuate
to de-energize the transfer pump
and
close
the transfer valve (the
crossflow valve will remain open) .
If the
fuselage tank should empty
before the wing float switches shut
down
the left transfer system, a
pressure switch in the fuselage tank transfer
line will illuminate the
EMPTY light . The green FUEL SYS light
will
illuminate when NORM XFR is selected
and flash whenever the EMP-
TY light
illuminates . Setting the switch to
Off will extinguish the
EMPTY light
(if illuminated), close the left transfer
valve, de-energize
the left transfer
pump, enable the standby pumps, and close the cross-
flow valve
. Whenever the left transfer valve is open, a vertical bar
(on
the switch) will
illuminate to annunciate the valve's open status . If the
transfer valve is neither open nor
closed, the vertical bar will flash .
An
ON
annunciation (on the switch) will
illuminate whenever power
is applied
to the left transfer pump . The left fuel
transfer valve oper-
ates on 28
VDC supplied through the 5-amp
L JET PUMP-XFR
VALVE circuit
breaker on the pilot's circuit breaker
panel . Loss of
2-30

PM-123
Original