Boeing 737-800 - Ground Power Panel and Bus Switching Panel

737 Flight Crew Operations Manual
Electrical -
Controls and Indicators
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
6.10.6 D6-27370-866-EGP
4 STANDBY POWER Switch
AUTO (guarded position) –
• In flight, or on the ground, and AC transfer busses powered:
• AC standby bus is powered by AC transfer bus 1
• DC standby bus is powered by TR1, TR2 and TR3
• In flight, or on the ground, loss of all AC power
• AC standby bus is powered by battery through static inverter
• DC standby bus is powered by battery
• Battery bus is powered by battery.
OFF (center position) –
• STANDBY PWR OFF light illuminates
• AC standby bus, static inverter, and DC standby bus are not powered.
BAT (unguarded position) –
• AC standby bus is powered by battery through static inverter
• DC standby bus and battery bus are powered directly by battery.
Ground Power Panel and Bus Switching Panel
AVAILABLE
GRD POWER
OFF
ON
PWR
GRD
OFF BUS
APU GENGEN OFF
BUS
BUS OFF
TRANSFER
SOURCE
OFF
GEN OFF
BUS
BUS OFF
TRANSFER
SOURCE
OFF
BUS TRANSFER
O
F
F
O
T
U
A
OFF
ON
OFF
ON
GEN 1 APU GEN GEN 2
APU
FORWARD OVERHEAD PANEL
1
2
3
4
5
6
7
8
9
May 15, 2008