King Air C90GTi, Pilot Training Manual

Page: 54 / 557

Voltage on each bus may be monitored on
the voltmeter (located in the overhead panel)
by selecting the desired bus using the VOLT-
METER BUS SELECT switch, adjacent to
the voltmeter. The electrical system pro-
vides maximum protection against loss of
electrical power should a ground fault occur.
High cur rent (Hall effect) sensors, bus tie
relays and cur rent limiters are provided to
isolate a f ault from its power source. The
e l e c t r i c a l s y s t e m b u s a r r a n g e m e n t i s d e -
signed to provide multiple power sources
for all circuits. DC POWER DISTRIBUTION
The DC power distribution system is com-
monly called a “triple-fed” system. In nor-
mal operation, all buses are automatically
tied into a single loop system in which all
sources collectively supply power through
individual protective devices.
T h r e e i n - f l i g h t D C p owe r s o u r c e s a r e
available:
• One 24-volt, 42-ampere hour, lead acid
batter y
• Two 2 8 - v o l t , 2 5 0 - a m p e r e s t a r t e r /
generators
Figure 2-4. Overhead Meter Panel
FOR TRAINING PURPOSES ONLY
2-5
KING AIR C90GTi/C90GTx PILOT TRAINING MANUAL
2
ELECTRIC
AL
POWER
SY
STEMS