Winterization Kit - Cessna 172S Nav III Information Manual

_
CESSNA SECTION 4
MODEL 172S NAV III NORMAL PROCEDURES
COLD WEATHER OPERATIONS (Continued)
Prior to starting on cold mornings, it is advisable to turn the
propeller manually through several engine compression cycles by
hand to loosen the oil, so the engine cranks (motors) more easily
and uses less battery power. When the propeller is turned
manually, turn it in the opposite direction to normal engine rotation
for greater safety. Opposite rotation disengages the magneto
impulse couplings and prevents possible unwanted ignition.
When using an external power source, the MASTER switch ALT
and BAT sections must be in the OFF position before connecting
the external power source to the airplane receptacle. Refer to
Section 7. Ground Service Plug Receptacle, for external power
source operations.
Cold weather starting procedures are the same as the normal
starting procedures. However, to conserve battery power the beaconl
light can be left off until the engine is started. Use caution to prevent|
inadvertent forward movement of the airplane during starting when
parked on snow or ice.
NOTE
If the engine does not start during the first few
attempts, or if engine firing diminishes in strength,
the spark plugs may be frosted over. Preheat must
be used before another start is attempted.
During cold weather operations, the oil temperature indicator may
not be in the green arc prior to takeoff if outside air temperatures
are very cold. After a suitable warm up period (2 to 5 minutes at
1000 RPM), accelerate the engine several times to higher engine
RPM. If the engine accelerates smoothly and the oil pressure
remains normal and steady, the airplane is ready for takeoff.
WINTERIZATION KIT
An optional winterization kit is available and may be utilized whenl
cold weather operations are conducted. Refer to Section 9,1
Supplement 4 for installation and operational details.
172SPHAUS-03 U.S. 4-49