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CESSNA
MODEL
172N
SECTION
4
NOR,MAL PROCEDURES
AMPLIFIED
PROCEDURES
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
tempera-
tures,
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 starting
proce-
dure
without
any additional
priming.
If
the engine is underprimed (most
likely
in
cold
weather
with
a
cold
engine)
it wiII
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 concerning
cold weather
starting
and
operation may
be
found
under
COLD
WEATHER
OPERA-
TION paragraphs
in this
section.
TAXIING
When
taxiing, it
is important that
speed and
use of brakes
be
held to
a
minimum
and
that
all
controls
be
utilized
(see
Taxiing Diagram, figure
4-
2)
to
maintain directional control
and
balance.
The
carburetor heat control knob should
be
pushed
ground operations unless
heat
is absolutely
necessary.
pulled out to the
heat
position, air entering the engine
1
JuIy
1979
full
in during all
When the
knob is
is not filtered.
4-tl
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