Textron Cessna C172S PIM, Pilot Operating Handbook

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CESSNA SECTION 4
MODEL 172S NAV III NORMAL PROCEDURES
GFC 700 AFCS
U.S.
COLD WEATHER OPERATION
(Continued)
STARTING
(Continued)
Cold weather starting procedures are the same as the normal starting
procedures. However, to conserve battery power the beacon 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.
During cold weather starting, when performing the Standby Battery
energy level test, the test lamp may not illuminate and the BUS E volts
may be less than 24 volts before turning on the MASTER (ALT and
BAT) switch. After engine start, verify the S BATT ammeter shows a
charge (positive) at 1000 RPM or greater. Prior to takeoff verify the S
BATT ammeter shows a charge less than 0.4 amps.
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 band 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 RPMs. 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 when cold
weather operations are conducted. Refer to Section 9, Supplement 4
for installation and operational details.
172SPHBUS-00 4-47