Generator Or Main Bus Malfunctions - Textron Cessna Grand Caravan Ex 208B Pilot's Operating Handbook And Faa Approved Airplane Flight Manual

SECTION 3 CESSNA
EMERGENCY PROCEDURES MODEL 208B 867 SHP
GARMIN G1000
ELECTRICAL POWER SUPPLY SYSTEM
MALFUNCTIONS

GENERATOR OR MAIN BUS MALFUNCTIONS

Illumination of the red VOLTAGE LOW annunciator is a warning that
the power distribution bus voltage is low enough to start discharging the
battery. Monitor the BUS VOLTS reading to verify the low bus voltage
condition. A low or 0 (zero) reading of the GEN AMPS indicator
confirms that the charge is insufficient or generator output current is 0
(zero). If the amber GENERATOR OFF annunciator comes on, it
indicates that the generator contactor has disconnected the generator
from the power distribution bus. The most likely causes of a generator
trip (disconnection) are line surges, open circuit breakers or accidental
switch operation. In these cases, follow the AMBER GENERATOR
OFF ANNUNCIATOR COMES ON checklist procedures to restore
generator operation.
The airplane is equipped with two starter contactors. One is used for
starts using external power and the other for battery starts. If either
contactor does not open after reaching approximately 46% N , the
g
amber STARTER ON annunciator will remain on. In most cases when
this occurs, the generator will not transfer over to the generator mode,
and the amber GENERATOR OFF annunciator will remain on. Under
these conditions, it will be necessary to shutdown the engine using the
Normal Checklist procedures and correct the malfunction prior to next
flight.
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FAA APPROVED
3-54
208BPHCUS-00
U.S.