Avionics Master Switches; Electrical Control Panel (Figure 5-6) - BOMBARDIER LEARJET 40 Pilot's Manual

Pilot's Manual

AVIONICS MASTER SWITCHES

Left and right avionics master switches are located on the electrical
control panel below DU 2 (Figure 5-6). When the alternate action
avionics master switches are selected to On (OFF annunciator
extinguished), contactors are closed that connect the left and right
essential avionics buses and left and right main avionics buses to the
respective generator buses.
The associated essential contactors and main bus contactors must be
closed for the avionics buses to be powered. If the avionics master
switches are on during ground start or for a starter assisted airstart, the
essential avionics buses will continue to be powered, but the contactors
for the main avionics buses will automatically open until the start is
complete. The essential avionics buses must remain powered during an
airstart since they power the critical flight display units. The emergency
bus, essential buses and essential avionics buses are all powered by the
emergency battery during a starter assisted start. The avionics equip-
ment that must be on during a ground start is powered from the essen-
tial buses and the emergency battery bus.
L AV
MSTR
OFF
L MAIN
OFF
L GEN
OFF
EXT PWR
ON
AVAIL
5-32
ELECTRICAL
EMER BATT
L ESS
EMER
OFF
L
NON-ESS
OFF
BUS-TIE
MAN
L BATT
OFF
ELECTRICAL CONTROL PANEL
Figure 5-6
R AV
MSTR
R ESS
OFF
R
NON-ESS R MAIN
OFF
OFF
R GEN
OFF
R BATT
OFF
PM-132A