Cessna 172N - Page 62

SECTION
4
NORMAL
PROCEDURES
CESSNA
MODEL
172N
(2)
Propeller
Area
--
CLEAR.
(3)
Master Switch
--
ON.
(4)
Mixture
--
FULL
RICH.
(5)
Ignition Switch
--
START.
(6)
Rrmp throttle rapidly to
tulI
open twice.
Rehrrn
to
1/8.inch
open
position.
(?)
Release ignition
switch
to BOTH
wtren
engine
starts.
(8)
Continue
to
prime
engine
until it is
running
smoothly, or alter-
nately
Frmp
throttle rapidly
over first
L/4
ot total travel.
(9)
Oil Preszure
--
CHECK.
(10)
RrlI carburetor heat
knob tuIl
on
after
engine
has
started.
Leave on
until
engine
is running
smoothly.
(11)
Lock primer.
NOTE
If
the
engine
does
not
start
during
the first few
attempts,
or if
the engine
firing
diminishes in strength, it is
prob-
able that the
sprk
plugs
have been frosted over.
Pre-
heat
must be
used
before another
start
is
attempted.
Pumping
the
throttle
may
cause raw
fuel
to accumulate
in
the
intake
air
duct,
creating
a
fire hazard in the
event
of a
bacldire.
If this occurs,
maintain
a cranking
action
to
suck flames
into the
engine. An
outside
attendant with
a
fire
extinguisher
is advised
for
cold
starts without
pre-
heat.
During
cold
weather operations,
no
indication
will be apparent
on
the
oil temperafure
gage
prior
to takeoff if outside air
temperatures
are
very
cold.
After
a
zuitable warm-up
period
(2
to 5
minutes
at 1000
RPM), ac-
celerate
the
engine
several
times
to higher
engine RPM. If the engine ac-
celerates
smoothly
and
the
oil
pressure
remains normal and
steady,
the
airplane
is
ready for
takeoff
.
FTIGHT
OPERATIONS
Takeoff
is
made normally
with
carburetor heat
off.
Avoid excessive
leaning in cnrise.
Carhrretor
heat
may
be used to
overcome
any
occasional
engine
roughness
due
to ice.
When
operating
in
temperafures
below
-18"C,
avoid
using
partial
car-
4-22