FAA Approved Airplane Flight Manual Supplement

190-00716-03 Rev. 1 Hawker Beechcraft B300 and B300C King Air
Page 133 of 141
STANDBY BATTERY POWER SUPPLY
The G1000 installation incorporates a 24 vdc, 5 Ah L-3 Avionics model PS-835 Standby
Battery that provides electrical power for the standby attitude gyro, standby altimeter
vibrator, and internal lighting for the three standby instruments and magnetic compass
for a minimum of 30 minutes following a total loss of aircraft power including the
aircraft’s battery.
A push button switch located directly below the standby airspeed indicator controls the standby battery
power system. The switch is a push ON (switch latches in), push OFF (switch pops out) type of switch.
The system has three modes: OFF, ON, and ARM.
OFF The system is OFF when the Standby Battery switch is not depressed. There are no
internal switch annunciators illuminated in the switch when the system is OFF.
ON (Amber) Illuminates when the standby battery is powering the standby instruments. The Standby
Battery switch must be latched ‘IN’ and the airplane has no source of normal electrical
power for the standby battery to power the standby instruments. When the ON
annunciator is illuminated, the standby battery will provide electrical power for the three
standby instruments for at least 30 minutes.
ARM (Green) The system is armed for automatic operation when the Standby Battery switch is latched
‘IN’ and the airplane is being powered by a normal source of electrical power. Normal
power sources include the airplane’s battery, at least one generator, or external power.
During normal operations, the standby battery remains in a fully charged state by its own trickle charger,
which is powered from the electrical system through the STBY AUX BAT circuit breaker located on the
right side circuit breaker panel.