SECTION 4
CESSNA
NORMAL PROCEDURES
MODEL 172S NAV III
KAP 140 AUTOPILOT
U.S.
COLD WEATHER OPERATION
(Continued)
STARTING
When air temperatures are below 20°F (-6°C), use an external
preheater and an external power source whenever possible to obtain
positive starting and to reduce wear and abuse to the engine and
electrical system. Preheat will thaw the oil trapped in the oil cooler,
which probably will be congealed prior to starting in extremely cold
temperatures.
WARNING
WHEN TURNING THE PROPELLER BY HAND, TREAT IT
AS IF THE MAGNETOS SWITCH IS IN THE ON
POSITION. A LOOSE OR BROKEN GROUND WIRE ON
EITHER MAGNETO COULD ENERGIZE THE ENGINE.
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,
External Power Receptacle, for external power source operations.
(Continued Next Page)
172SPHAUS-05
4-50
For
Training
Purposes
Only
Содержание Cessna 172S NAV III Skyhawk SP
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