ternator
to the
battery
or from the
battery
to the
aircraft electrical
sys-
tem.
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",
below the engine
instrument cluster.
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.
Most
of
the
electrical circuits
in
the
airplane are protected
by "push-
to-reset'
circuit
breakers
mounted
on
the
instrument
panel.
Exceptions
to
this are
the
battery contactor
closing
(external
power)
circuit,
and
the
optional clock and flight hour
recorder circuits
which have
fuses
mounted
near
the
battery.
Also, the
cigar lighter
is
protected
by
a
manually-
reset
type
circuit breaker
mounted
directly
on
the back
of
the
lighter be-
hind the
instrument
panel.
When
more
than
one
radio is installed,
the
radio transmitter relay
(which
is
a
part
of
the
radio
installation)
is protected
by the navigation
lights circuit breaker
labeled
"NAV
LIGHTS." It
is
important
to remem~
ber that
any malfunction in the navigation
lights system
which
causes
the
circuit breaker
to open will
de-activate
both the navigation
lights
and the
2-5
Summary of Contents for 182 1973
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