Learjet 60 - Automatic Load Shedding System; Electric Power Monitor

Pilot's Manual

Learjet 60
ELECTRIC POWER MONITOR
An electric power monitor is installed on the pilot's instrument panel
to
monitor
left and
right
AC bus voltage, left and
right
DC generator
load and the DC
charging
bus voltage .
Digital
displays are used
for
voltage and amperage readouts . Each parameter
being
monitored is
di-
vided into
Normal,
Caution and
Warning
ranges .
Refer
to
Airplane
Flight
Manual
for
instrument
range
description
.
Whenever
any param-
eter goes
from
the
normal range
to the caution range, the indicator's
amber
light
and affected parameter
will flash . If
the parameter
progresses into the
warning
range, the indicator's red
light
and affected
parameter
will flash . The
amber
ELEC PWR light
(annunciator
panel)
will illuminate
(steady or
flashing) anytime
an amber or red
light
on the
indicator is
illuminated
(steady or
flashing) .
Whenever
any
parameter
goes into the caution range, the Master CAUT
lights will flash . When-
ever
any
parameter goes into the
warning
range, the Master WARN
lights will flash .
Depressing the amber or red
light,
as applicable,
will
cause the
lights
and displays to stop
flashing .
Depressing either Master
CAUT/Master WARN
light will
cancel the
flashing
of amber and red
warnings,
the affected parameter and the amber
ELEC PWR light
.
The
amber or red
light will remain illuminated
(steady)
until
the affected
parameter returns to the
normal range
. Caution and
warning annunci-
ations are
inhibited during
starter engagement .
A malfunction which
affects the accuracy of the indicator
will
cause
EE .E
to be displayed
in
the VDC readout and dashes "-"
in all
other
readouts .
Whenever the left and
right
inverters are out-of-phase, a "C"
will flash
in
the least
significant digit
of each VAC display .
The
electric power
monitor
is operative
during EMER
BUS mode .
AUTOMATIC LOAD SHEDDING SYSTEM
An automatic electrical load-shedding system is installed to automati-
cally reduce generator loading in the event of a single generator failure .
The system is only active during flight (weight not on wheels) . Should
either L or R GEN light illuminate in flight, the following loads will au-
tomatically shut down to reduce the load on the operating generator :
4-14
" CABIN PWR BUS Loads
" Air Conditioning System
" Cockpit Floorboard Heater System (if installed)
" Baggage Compartment Heater System (if installed)
If the generator is brought back on-line, these loads will be regained .
PM-123
Change 5