FAA Approved Airplane Flight Manual Supplement

190-00682-02 Rev. E Hawker Beechcraft C90A, C90GT and C90GTi King Air
Page 117 of 124
STANDBY BATTERY POWER SUPPLY
The G1000 installation incorporates a 24 vdc, 5 Ah JET 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 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 popped out. 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
source of electrical power includes the airplane’s battery, or, at least one generator, or
external power.
During normal operations, the standby battery is kept in a fully charged state by its own trickle charger
powered from the triple-fed bus through the STBY AUX BAT circuit breaker located on the right side
circuit breaker panel.