Beechcraft Duchess 76 - Page 203

BEECHCRAFT
Duchess 76
Section VII
Systems Description
Individual alternator output is indicated by the two
loadmeters (as opposed to the
charge/discharge-type
ammeter) located on the instrument panel. The loadmeters
give a percentage reading of the load on the system.
There are two pairs of alternator-out warning lights, each
pair placarded ALTERNATOR OUT - UNDER/OVER
VOLTAGE. Each pair is adjacent to its corresponding
loadmeter, located on the instrument panel. Anytime either
alternator voltage
is 4 ± .1 volts (28-volt system) or 2 ± .1
volts (14-volt system) below the bus voltage,. the
corresponding undervoltage alternator-out I ight wi II
illuminate. When the battery is turned on with both
alternators off, both alternator-out undervoltage lights will
illuminate. The alternator-out overvoltage light (one for each
alternator) will illuminate when the corresponding
overvoltage relay is actuated. The overvoltage relay opens
the affected alternator field, and the affected alternator
voltage will drop to zero. The alternator-out lamps can
be
tested by pressing the TEST switch located adjacent to the
lamps.
STARTERS
The starters are relay-controlled and are actuated
by rotary-
type, momentary-on switches, incorporated
in the mag-
neto/start/prime switches located on the pilot's subpanel.
To
energize the starter circuit, hold the magneto/start/prime
switch
in the START position.
August, 1980
7-29