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Rear
cabin
heat
and air
is supplied
by
two
ducts
from
the
manifold,
one
extending
down each
side
of
the
cabin
to
an outlet
at
the
front
door post
at
floor level.
Windshield
defrost
air is also
supplied
by a duct leading
from
the
cabin
manifold.
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.
STARTING ENGINE.
During
engine
starting,
open
the throttle
approximately
1/8
inch.
In
warm
temperatures,
one
or
two
strokes
of
the
primer
should
be sufficient.
In cold weather,
up
to
six strokes
of
the
primer
may be necessary.
If
the
engine
is warm,
no
priming
will be required.
In extremely
cold
tem-
peratures,
it may be necessary
to
continue
priming
while
cranking
the
engine.
Weak
intermittent
firing
followed
by puffs
of black
smoke
from
the
exhaust
stack
indicates
overpriming
or
flooding.
Excess
fuel
can
be
cleared
from
the
combustion
chambers
by
the
following
procedure:
Set
the
mixture
control
full lean
and
the throttle
full open;
then
crank
the
engine
through
several
revolutions
with
the
starter.
Repeat
the
start-
ing procedure
without
any
additional
priming.
If
the
engine
is underprimed
(most
likely
in cold weather
with
a
cold
engine)
it will not
fire
at
all,
and
additional
priming
will be necessary.
As soon
as
the
cylinders
begin
to
fire,
open
the throttle
slightly
to
keep
it running.
After starting,
if
the
oil gage
does not begin
to
show
pressure
within
30 seconds
in
the
summertime
and about
twice that
long in very
cold
weather,
stop
engine
and investigate.
Lack
of oil pressure
can cause
serious
engine
damage.
After
starting,
avoid
the
use of
carburetor
heat
unless
icing
conditions
prevail.
NOTE
Additional
details
for cold weather
starting
and
operation
may be found under
Cold
Weather
Operation
in
this
section.
2-6
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