button type switch
labeled
"ALT RESTART". This switch
is
used
in the
event
of
a complete
loss
of
electrical
power due to a faulty
battery
con-
tactor.
The
alternators
are
self
sustaining, and
under
normal
electrical
loads
w1l1
remain
in
operation
even though the
battery
is
isolated
from
the
systom.
However, under conditions
of
extreme
electrical
load (such
as
IFR
conditions),
an
additional heavy
surge
load (such
as
wing flap
opera-
tion)
may
lower
system
voltage below the voltage
necessary
to maintain
alternator
output, which will
result
in a complete
loss
of
electrical
power.
Refer
to Section m
under
"ELECTRICAL SYSTEM-EMERGENCY OPERA-
TION" for
proper
alternator
restart
procedures.
ALTERNATOR WARNING
LIGHTS.
Rectangular
amber
lights
labeled
"ALT NOT CHARGING, FRONT,
REAR" will light
if
either
or
both
alternators
stop supplying
current
to
the
electrical
system.
If
a light
comes
on, the faulty
alternator
should be
turned
off. The "ALT NOT CHARGING" light
or
lights will
remain
on
until the flight
is
terminated.
If
the "FRONT" and "REAR" lights
come
on
simultaneously,
it
may
mean
a faulty voltage
regulator.
To check thiS,
switch
to the
regulator
not
in
use.
IT
the voltage
regulator
was faulty, the
lights
will go out. The warning lights can be checked by turning
on
the
master
switch
before
the
engines
are
started,
or
by turning
the
alternator
switches
off while
the
engines
are
running.
HIGH
VOLT
AND
BATTERY
DISCHARGE LIGHTS.
Two
rectangular
warning lights, one
red
and one
amber,
are
under
the
alternator
warning
lights
and indicate high voltage and low voltage
conditions
in
the
electrical
system.
They
are
labeled
"VOLTS BAT,
HIGH,
DIS."
The
red
light,
labeled
"HIGH"
indicates
any unusually high
voltage
occurring
in
the
electrical
system.
High voltage
can
be
caused
by a
faulty
alternator
system,
or
a voltage
regulator
not functioning
properly.
The
red
"HIGH" voltage light can be
tested
by
pressing
a
push-to-test
type switch
labeled
"TEST.
t!
This
also
tests
the high voltage
sensing
cir-
cuitry,
and
does
not
subject
the
electrical
system
to high voltage
anytime
1t
Is
used.
The
amber
light,
labeled
"DIS, "
indicates
a low voltage condi-
tion
in
the
electrical
system.
This
light
does not
necessarily
indicate
a
malfunction. A low voltage condition,
as
indicated
by
the
amber
light,
may be due to the
battery
supplying
all
of the
electrical
load,
or
the
elec-
trical
load
may
be
exceeding the
alternator
output. The
latter
usually
occurs
when one of
Jhe
alternators
is
out of the
system.
The
amber
"DIS"
light may be
tested
by turning the
master
switch
on
prior
to
starting
the
engines.
Refer
to
Section
ill
under
"ELECTRICAL SYSTEM-EMERGENCY
OPERATION"
for
proper
emergency
procedures
in
the event of a
red
"HIGH"
or
amber
"DIS"
light.
TURN-AND-BANK
TEST
LIGHT.
An
amber
!IT
& B TEST"
light
is
mounted
in
the shock
panel
directly
below the
turn
coordinator
or
optional
turn
and bank
indicator.
When
the
light
is
depressed,
(master
switch "ON") the
light
will
illuminate
if
elec-
trical
power
is
being supplied to the
instrument.
CIRCUIT
BREAKERS
AND
FUSES.
Most of the
electrical
circuits
in
the
airplane
are
protected
by
"push-
to-reset"
type
circuit
breakers
mounted
in
a
panel
located
on
the
left
side
of
the
cabin
beside
the
pilot.
Exceptions to
this
are
the clock CirCuit, the
alternator
restart
circuit,
the optional
battery
contactor closing
(external
power)
circuit,
the optional flight hour
recorder
circuit
and
the
optional
ammeter
circuit
which
are
protected
by
fuses.
The'
fuses
for
the
clock,
flight hour
recorder,
alternator
restart
circuit,
and
battery
contactor
closing
circuit
are
located
near
the upper
left
hand
side
of
the
front
fire-
wall.
Two
fuses
near
the
lower
left
hand
side
of the
front
firewall
protect
the
optional
ammeter.
Fuses
are
provided
in
addition to
circuit
breakers
for
the
cigar
lighter
and optional control wheel map
light
circuit.
The
cigar
lighter
fuse
is
located
behind the engine control
pedestal.
The op-
tional
control
wheel
map
light
fuse
is
mounted behind
the
left
side
of the
instrument
panel.
INTERIOR LIGHTING.
INSTRUMENT
AND
CONTROL
PANEL
LIGHTING.
Instrument
and
control
panel lighting
is
provided
by
three
main
lources:
electroluminescent
lighting, flood lighting
and
optional
post
l1ghting. The magnetic
compass,
engine
instrument
cluster,
and
radios
have
Integral
lighting. All
instrument
and
control
panel
lighting
is
oper-
ated
by
two
rheostat
control
knobs
on
the
left
switch and
control
panel.
2-9
2-8
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