switch, when
placed
in the OFF position,
removes
the alternator from
the electrical
system.
With
this switch in the OFF position, the entire
electrical load is
placed
on the battery. Continued operation
with
the
alternator switch OFF
will
reduce
battery
power
low
enough
to
open
the
battery
contactor,
remove
power
from the alternator field, and prevent
alternator restart.
AMMETER.
The ammeter indicates the flow of current, in
amperes,
from the
alternator to the battery or from the battery to the aircraft electrical
system.
When the
engine
is operating and the master switch is ON,
the ammeter indicates the charging rate applied to the battery. In the
event
the alternator is not functioning or the electrical load
exceeds
the
output of the alternator, the ammeter indicates the
discharge
rate of the
battery.
OVER-VOLTAGE
SENSOR
AND
WARNING
LIGHT.
The aircraft is
equipped
with
an automatic
over-voltage
protection
system
consisting of an
over-voltage
sensor
behind the instrument panel
and a red warning
light,
labeled
HIGH
VOLTAGE, under the oil tempera-
ture
and
pressure
gages.
In
the
event
an
over-voltage
condition
occurs,
the
over-voltage
sen-
sor automatically
removes
alternator field current and shuts down the
alternator. The red warning
light
will
then
turn
on, indicating to the
pilot
that
the alternator is not operating and the aircraft battery is supply-
ing
all electrical
power.
The
over-voltage
sensor
may be
reset
by
turning
the master switch
off and
back
on again. If the warning
light
does
not illuminate, normal
alternator charging has
resumed;
however,
if the
light
does
illuminate
again, a malfunction has
occurred,
and the
flight
should be terminated
as
soon
as practical.
The
over-voltage
warning
light
may be tested by momentarily
turning
off the ALT portion of the master switch and leaving the BAT portion
turned
on.
CIRCUIT
BREAKERS
AND
FUSES.
The majority of electrical circuits in the airplane are protected by
"push-to-reset"
circuit
breakers
mounted on the instrument panel. Ex-
2-5
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