TRANSMITTER
SELECTOR
SWITCH. ELECTRICAL
SYSTEM.
The transmitter selector
switch, labeled
"TRANS,
"
has two positions.
Electrical
energy
is
supplied by
a
14-volt,
direct-current
system
When
two transmitters
are
installed, it is
necessary to
switch the
micro-
powered by
an
engine-driven
alternator (see figure
2-3). A
12-
volt
bat-
phone
to
the
radio
unit the
pilot desires
to use for
transmission.
This is
tery
is
located on the
left-hand
forward portion of the firewall. Power
is
accomplished
by placing
the
transmitter
selector
switch in the
position
supplied
to all electrical
circuits
through
a
split bus bar,
one side
con-
corresponding
to
the radio
unit
which
is to be used.
The up
position
taining
electronic
systems
and
the
other side having
general electrical
selects the
upper transmitter
and
the
down position
selects the
lower
systems.
Both
sides
of
the bus are
on
at all
times
except
when
either
an
transmitter. external power
source
is
connected or the ignition/starter switch
is turned
on;
then
a
power
contactor
is
automatically activated to open the
circuit to
The
installation of Cessna radio equipment
provides certain
audio
the electronic
bus.
Isolating
the electronic circuits in
this manner
pre-
back-up capabilities
and transmitter selector
switch functions
that the
vents harmful
transient
voltages
from damaging
the transistors in the
pilot
should
be
familiar
with. When
the
transmitter
selector
switch
is
electronic equipment.
placed
in
position 1 or
2, the audio amplifier
of the corresponding
trans-
ceiver
is
utilized
to
provide the
speaker
audio for all
radios. If the
audio
amplifier in
the
selected
transceiver
fails, as
evidenced
by loss
of speaker
AMMETER.
audio for all
radios,
place the transmitter selector switch
in
the other
transceiver position.
Since an audio
amplifier is
not utilized for
head-
The ammeter
indicates the
flow
of
current,
in amperes, from
the
phones,
a
malfunctioning
amplifier will not affect
headphone operation.
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
SPE
A
KERPHONESW
ITCHES.
event the alternator
is
not
functioning
or
the electrical load
exceeds the
output of the
alternator,
the ammeter indicates
the discharge rate of the
The
speaker-phone
switches
determine whether the
output
of the
battery.
receiver in
use
is
fed to
the headphones or through
the audio amplifier
to
the speaker.
Place the
switch
for the desired
receiving system either
in
the up position for speaker
operation or
in the
down position for
head-
CIRCUIT BREAK ERS
AND
FUSES.
phones.
The majority
of
electrical circuits in the
airplane are protected by
"push-to-reset"
circuit
breakers
mounted
on
the instrument panel.
Ex-
A
UTO
PI
LO
T-
OMN I
SW
I
TCH.
ceptions
to
this are
the
optional
clock,
flight hour
recorder, and battery
contactor
closing
(external power) circuits which
have
fuses
mounted
When a
Nav-O-Matic
autopilot
is installed with two
compatible omni adjacent to the
battery. Also,
the cigar lighter
is
protected
by
a
man-
receivers,
an
autopilot-omni
switch
is
utilized. This switch selects
the
ually reset type circuit
breaker mounted
directly on the back
of the
lighter
omni receiver to
be used for
the
omni course
sensing
function of
the
auto-
behind the instrument
panel. The
alternator
field
and
wiring is
protected
pilot. The
up
position
selects the
upper
omni receiver
in the radio
panel
by
an
automatically
resetting circuit breaker.
stack and
the
down position selects
the
lower omni receiver.
LANDING
LIGHTS
(OPT).
A
three-position,
push-pull
switch controls
the optional landing
lights. To
turn one lamp on
for
taxiing,
pull the
switch out
to the
first
stop. To
turn both
lamps on
for
landing,
pull
the switch out to the
sec-
ond stop. To
turn
both
lamps
off,
push
the switch full
in.
6-4
2-3
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