737 MAX Flight Crew Operations Manual
Electrical -
Controls and Indicators
6.10.6
MN-FLT-OH-201
4
STANDBY POWER Switch
AUTO (guarded position) –
• In flight, or on the ground, and AC transfer buses 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 GEN
GEN 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
March 1, 2021