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CESSNA SECTION 7<br />

MODEL 208B G1000 AIRPLANE AND SYSTEMS DESCRIPTION<br />

ELECTRICAL SYSTEM<br />

The airplane is equipped with a 28-volt, direct-current electrical system<br />

(see Typical Electrical System figure). The system uses a 24-volt<br />

sealed lead acid battery; located on the front right side of the firewall,<br />

as a source of electrical energy. A 200-amp engine-driven startergenerator<br />

is used to maintain the battery's state of charge. Power is<br />

supplied to most general electrical and all avionics circuits through two<br />

general buses, two avionics buses, and a hot battery bus. The battery<br />

bus is energized continuously for cabin/courtesy lights and functions<br />

requiring power when the two general busses are off. The two general<br />

buses are on anytime the battery switch is turned on. All DC buses are<br />

on anytime the battery switch and the two avionics switches are turned<br />

on.<br />

STANDBY ELECTRICAL SYSTEM<br />

The standby electrical system serves as a power source in the event<br />

the main generator system malfunctions in flight. The system includes<br />

an alternator operated at a 75-amp capacity rating. The alternator is<br />

belt-driven from an accessory pad on the rear of the engine. The<br />

system also includes an alternator control unit located forward of the<br />

circuit breaker panel, a standby alternator contactor assembly on the<br />

left front side of the firewall and two switches on the left sidewall switch<br />

panel, labeled STBY ALT POWER and AVIONICS STBY PWR.<br />

Circuit protection and isolation is provided by two circuit breakers,<br />

labeled STBY PWR, on the left sidewall circuit breaker panel. Field<br />

excitation to the alternator control unit is supplied through diode logic<br />

from a circuit breaker in the standby alternator relay assembly or from<br />

the HOURMETER/ACU circuit breaker in the main power relay box.<br />

Standby Electrical system monitoring is provided by CAS messages;<br />

White STBY PWR ON CAS MSG and Amber STBY PWR INOP CAS<br />

MSG. Total amperage supplied from the standby electrical system can<br />

be monitored on the EIS SYSTEMS DISPLAY. Additionally, an ALTNR<br />

AMPS CAS message is provided if the standby alternator amperage<br />

draw exceeds normal operating ranges.<br />

208BPHBUS-00<br />

U.S.<br />

7-71

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