Airplane Flight Manual Supplement

190-00682-02 Rev. D Hawker Beechcraft C90A and C90GT King Air
Page 109 of 117
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.
LIGHTING SYSTEMS
COCKPIT
An overhead light control panel, accessible to both pilots, incorporates a functional arrangement of all
lighting systems. Each light group has its own rheostat switch placarded BRT – OFF. The MASTER
PANEL LIGHTS – ON – OFF switch is the master switch for: PILOT PFD, STBY INSTR, MFD, OVHD
PED & SUBPANEL SIDE PANEL CLOCKS, and COPILOT PFD.
PILOT PFD – Controls the brightness of the pilot’s PFD.
STBY INSTR – Controls the brightness of the internal lighting for the standby attitude indicator,
standby altimeter, and standby airspeed indicator.
MFD – Controls the brightness of the Multi-Function Display (MFD).
OVHD PED & - Controls the brightness of the backlighting of the overhead light control panel
SUBPANEL and internal lighting of the overhead electrical gauges, throttle quadrant
backlighting, internal lighting for pedestal mounted gauges, and the MFD
Controller panel backlighting, and the subpanel backlighting.
SIDE PANEL – Controls the brightness of the backlighting of the right side circuit breaker panel,
the left side circuit breaker panel and the fuel gauge panel.
CLOCKS – Controls the brightness of the clocks mounted in the pilot’s and copilot’s control
wheels.
COPILOT PFD – Controls the brightness of the copilot’s PFD.
Separate rheostat switches individually control the instrument indirect lights in the glareshield and
overhead map lights.
An INSTRUMENT EMERG LIGHTS switch is located on the right side of the overhead electrical gauge
panel. This switch turns on indirect lights under the glareshield. These lights are separate from the
Instrument Indirect lights. The brightness of the Emergency Lights is not controllable. These lights are
powered from the Hot Battery bus.