GROUND
SERVICE
PLUG
RECEPTACLE.
cONTROL WHEEL MAP
LIGHT
(OPT.)
A ground service
plug
receptacle
may be installed to permit
use of
an
A map
light
may
be
mounted on the
bottom of the pilot's
control wheel.
external power source
for
cold weather
starting and
during
lengthy
main-
The light illuminates the
lower
portion
of the
cabin
just
forward
of
the
tenance
work on
the airplane electrical
system
(with
the
exception
of
elec-
pilot and is helpful
when
checking
maps
and
other
flight data
during
night
tronic
equipment).
operations.
To
operate
the light,
first
turn the
"NAV LIGHTS"
switch
on,
then
adjust
the map
light's intensity
with
the
knurled
rheostat knob located
NOTE
at
the
bottom
of
the
control
wheel.
Electrical power
for
the
airplane electrical
circuits is
pro-
FLASHING
BEACON
(OPT).
vided
through
a
split
bus bar
having
all
electronic
circuits
on
one side of the bus
and
other electrical
circuits on the
The
flashing
beacon should
not
be
used
when
flying through clouds
or
other side
of
the bus. When
an
external
power
source is
overcast; the flashing
light
reflected
from water
droplets or particles
in
connected,
a
contactor
automatically opens
the
circuit to
the
atmosphere,
particularly
at
night,
can produce
vertigo and loss
of
the
electronic
portion
of
the
split bus
bar
as a protection
orientation.
against damage
to the
semi-conductors
in the
electronic
equipment by
transient
voltages from the power
source.
Therefore,
the
external power
source can not be
used
as
CA
B
IN
HEATI
N G,
VENT IL
ATING
A
ND
a
source of
power when
checking
electronic
components.
DEFROSTING
SYSTEM.
Just before
connecting
an external
power
source (generator
type or
bat-
For
cabin
ventilation,
pull
the
"CABIN AIR" knob
out.
To
raise the
tery
cart),
the
master switch should
be
turned
"ON.
air
temperature,
pull the
"CABIN HT"
knob
out approximately 1/4" to
1/2" for
a
small amount of
cabin
heat. Additional
heat is available by
The ground
service
plug
receptacle circuit incorporates
a
polarity
pulling the knob out farther;
maximum heat
is
available
with the
"CABIN
reversal
protection.
Power
from
the
external power source
will
flow only
HT" knob
pulled full out
and the
"CABIN AIR" knob pushed full in. When
if the
ground
service plug
is correctly
connected
to the airplane.
If
the
plug
is accidentally
connected
backwards, no
power will flow to the
air
_
no heat is
desired in the cabin, the "CABIN
HT"
knob is
pushed full
in.
plane's
electrical
system,
thereby
preventing any damage to
electrical
Front
cabin heat and ventilating air is supplied
by
outlet
holes spaced
equipment.
across a
cabin
manifold
just forward
of
the pilot's
and
copilot's feet.
The
battery
and external power
circuits have been designed to
com-
Rear cabin
heat
and air
is supplied by
two ducts from the
manifold,
one
pletely eliminate the
need
to
"jumper"
across the
battery
contactor
to close
extending
down each side
of the cabin
to
an
outlet
at the
front door
post
at
it for charging a
completely
"dead"
battery.
A
special
fused circuit in the
floor level.
Windshield
defrost air
is
also supplied
by
a
duct
leading
from
external
power system
supplies
the needed "jumper" across the
contacts
the cabin manifold.
so
that with
a
"dead"
battery
and
an
external
power source
applied,
turn-
ing the
master switch
"ON" will
close
the battery
contactor.
Separate adjustable
ventilators
supply
additional air;
one
near
each
upper corner
of the
windshield supplies
air
for the
pilot
and copilot, and
two
optional ventilators in
the rear
cabin
ceiling supply
air
to the
rear
seat
passengers.
STATIC
PRESSURE
ALTERNATE
SOURCE
VALVE.
STARTING
ENGINE.
A
static pressure alternate source
valve
may
be
installed in the static
system
for use
when the external static
source is
malfunctioning.
During engine
starting,
open
the
throttle approximately 1/8 inch. In
6-2
2-5
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