Learjet 60 - CUR LIM Light; DC Circuit Breakers; GEN Lights

Learjet
60

Pilot's Manual
GEN LIGHTS
Amber L GEN and R GEN annunciator
lights are installed in the
glareshield annunciator panel . The lights
are controlled by the corre-
sponding generator
control circuits and will illuminate whenever
the
corresponding generator has
failed or is off the line . The light will
also illuminate whenever the corresponding
START-GEN switch is in
either START or OFF and at least
one BATTERY switch is On .
CUR LIM LIGHT
The amber CUR LIM
annunciator light, on the
glareshield annuncia-
tor panel, is
installed to indicate the continuity
of the 275-amp current
limiters .
The 275-amp current limiters
connect the battery charging
bus to the
generator buses . Failure of both
275-amp current limiters
will cause the equipment
connected to the battery
charging bus to be
powered from the
ship's batteries only . The
light is illuminated by
sensors wired across
the current limiter
terminals . A failure of
either
current
limiter will cause the respective
sensor to illuminate
the CUR
LIM light .
DC CIRCUIT BREAKERS
The
aircraft DC electrical circuits
are protected by
push-to-reset, ther-
mal-type
circuit breakers . Most DC
circuit breakers
are located on the
pilot's
and copilot's circuit
breaker panels . The L
and R DC BUS 1,
DC
BUS
2, and DC BUS 3 buses
may be interconnected
through the
DC
BUS
1 TIE, DC BUS 2 TIE,
and DC BUS 3 TIE
circuit breaker/switches
on the copilot's circuit
breaker panel . Normally
the L and R DC
buses
are not tied together . If it
is desired to tie a L
DC BUS and R DC
BUS
together,
the appropriate DC
BUS TIE circuit
breaker/switch
must be
in the
up (closed) position
. The DC BUS 1
circuit breaker on
each cir-
cuit
breaker panel
controls power to the
associated DC
BUS 1 bus
through control relays
. Circuit breakers
are grouped together
into sys-
tem types (e .g .
ELECTRICAL, LIGHTS,
AVIONICS) . Power to
oper-
ate the emergency bus system
is supplied from
the batteries
through
the
respective EMER BUS CONT
circuit breaker
(see figure
44) . The
circuit
breakers for equipment
powered during
EMER BUS
mode are
denoted
by red rings on the
overlay .
PM-123

4-9
Original