Learjet 60 - BATTERY Switches; START-GEN Switches

Learjet 60

Pilot's Manual
An emergency bus system is installed to operate selected equipment
from the aircraft batteries for the maximum duration in the event of a
dual generator failure . When the emergency buses are selected, the
battery charging bus is isolated from the batteries and the equipment
connected to the emergency buses will be powered from the aircraft
batteries .
BATTERY SWITCHES
The aircraft batteries are controlled through the BATTERY
1 and 2
switches on the pilot's switch panel . The #1 battery is wired
directly
to
the battery bus in the pilot's circuit breaker panel and
the #2 bat-
tery
is wired directly to the battery bus in the copilot's
circuit breaker
panel . When either BATTERY switch is placed in
the
On
position, the
corresponding battery relay closes to connect the respective
battery
bus to the battery
charging bus if the EMER BUS switch
is in the
NORMAL
position
.
When the BATTERY switch is placed
in the OFF
position, the battery relay is de-energized and
the respective battery
bus is isolated from the battery charging
bus . The battery relays
will
also be de-energized
whenever the EMER BUS switch is in the EMER
BUS position .
START-GEN SWITCHES
The starter/generators are
controlled through the START-L
GEN and
START-R GEN switches on
the pilot's switch panel .
Additionally, the
START position of
each switch is used to control
various functions re-
quired for the starting sequence . These functions
are described below .
Each switch has three positions : START, OFF, and
GEN . Prior to ini-
tiating the
starting sequence, the associated
thrust lever should be
placed in the IDLE detent .
START position : With the BATTERY
switches On, DC power from
the L and RSTART circuit
breakers is applied to the left and
right
START-GEN switches . When a
START-GEN switch is set to START,
DC power from the corresponding
START circuit breaker is
applied
to close the corresponding starter
relay, activate the corresponding
standby pump, cause the corresponding
motive flow valve to
close,
shutdown the cooling,
auxiliary heating, and stabilizer heat
systems,
and energize the
FADEC start sequence relay (supplies a discrete
start
signal to the FADEC) .
When the starter relay closes, the starter
will
PM-123
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4- 3
Original