Cessna 1980 182Q Pilot's Operating Handbook And Flight Manual page 66

SECTION 4
CESSNA
MODEL 182Q
NORMAL PROCEDURES
NOTE
If
the engine does not start during the first few attempts, or
if
engine firing diminishes in strength, it is probable that
the spark plugs have been frosted over. Preheat must be
used before another start is attempted.
CAUTION
Pumping the throttle may cause raw fuel to accumulate in
the intake air duct, creating a fire hazard in the event of a
backfire.
If
this occurs, maintain a cranking action to suck
flames into the engine.
An
outside attendant with a fire
extinguisher is advised for cold starts without preheat.
OPERATION
During cold weather operations, no indication will be apparent on the-
oil temperature gage 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. .
Rough engine operation in cold weather can be caused by a combina-
tion of an inherently leaner mixture due to the dense air and poor
vaporization and distribution of the fuel-air mixture to the cylinders. The
effects of these conditions are especially noticeable during operation on
one magneto in ground checks where only one spark plug fires in each
cylinder.
For optimum operation of the engine in cold weather, the appropriate
use of carburetor heat is recommended. The following procedures are
indicated as a guideline:
4-22
1.
Use carburetor heat during engine warm-up and ground check.
Full carburetor heat may be required for temperatures below -12° C
whereas partial heat could be used in temperatures between -12°C
and 4°C.
2. U se the minimum carburetor heat required for smooth operation in
take-off, climb, and cruise.
NOTE
Care should be exercised when using partial carburetor
heat to avoid iCing. Partial heat may raise the carburetor
air temperature to 0° to 21°C range.where icing is critical
under certain atmospheric conditions.
1 October 1979