Cold Weather; Starting - Cessna Skyhawk 172N 1980 Information Manual

CESSNA
MODEL
172N
SECTION
4
NORMAL
PROCEDURES
the go-around
climb,
reduce the
wingflap
setting to
10o
and
maintain
a
safe
airspeed
until
the obstacles are cleared.
Above
3000 feet,
lean
the
mixture
to obtain maximum
RPM.
After clearing
any
obstacles, the
flaps may
be
retracted
as
the airplane
accelerates
to the normal flaps-up climb
speed.
COLD WEATHER OPERATION
STARTING
Prior to starting
on cold
mornings, it is advisable
to
pull
the
propeller
through several times by hand to "break loose" or "limber" the oil, thus
conserving battery
energy.
NOTE
When
pulling
the propeller through
by hand, treat
it
as
if
the
ignition
switch is turned
on.
A
loose or
broken ground
wire on either magneto could
cause the engine to fire.
When
air
temperatures are below 20'F
(-6"C), the
use
of
an
external
!
preheater and an external power source are recommended whenever
I
possible to obtain positive starting
and
to reduce
wear
and
abuse
to the
engine
and
electrical
system. Pre-heat
will
thaw
the
oil trapped in
the
oil
cooler, which probably
will
be congealed
prior to starting in
extremely
cold temperatures.
When
using
an
external power
source, the
position of
the master switch is
important. Refer
to
Section 9, Supplements, for
Ground Service PIug
Receptacle
operating details.
Cold
weather starting procedures
are as
follows:
With
Preheat:
1.
With
ignition switch
OFF and
throttle
closed,
prime
the
engine
four
to eight strokes
as
the propeller is being turned over by
hand.
NOTE
Use
heavy strokes of
primer for
best
atomization of fuel.
After priming,
push
primer aII
the way
in
and
turn
to
Iocked
position
to avoid
possibility
of
engine
drawing fuel
through
the
primer.
2.
Propeller Area -- CLEAR.
3.
Avionics Power Switch --
OFF.
4.
Master Switch --
ON.
1
July
1979
Revision
1
-
15
November
1979
4-2t