CESSNA
MODEL 172R (180 HP)
SECTION 4
NORMAL
PROCEDURES
COLD WEATHER OPERATION
Special consideration should be given to the operation of the
airplane fuel system during the winter season or prior to any flight in
cold temperatures. Proper preflight draining of the fuel system is
especially important and will eliminate any free water accumulation.
The use of additives such as isopropyl alcohol or diethylene glycol
monomethyl ether may also be desirable. Refer to Section 8 for
information on the proper use of additives.
Cold weather often causes conditions which require special care
during airplane operations. Even small accumulations of frost, ice,
or snow must be removed, particularly from wing, tail and all control
surfaces to assure satisfactory flight performance and handling.
Also, control surfaces must be free of any internal accumulations of
ice or snow.
If snow or slush covers the takeoff surface, allowance must be
made for takeoff distances which will be increasingly extended as
the snow or slush depth increases. The depth and consistency of
this cover can, in fact, prevent takeoff in many instances.
STARTING
AwARNING
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.
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.
When air temperatures are below 20
°
F (-6
°
C), the use of an
external preheater and an external power source are recommended
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.
I
Oct 4/01
4-33
Summary of Contents for 172R180HP
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