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.
NOTE
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 pre
heat.
During cold weather operations, no indication will be apparent on the
oil temperature gage prior to take-off if outside air temperatures are very
cold. After a suitable warm-up period
(2
to
5
minutes at
1000
RPM), ac
celerate 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 take-off.
When operating in sub-zero temperature, avoid using partial carbu
retor heat. Partial heat may increase the carburetor air temperature to
the
32°
to
70°
range, where icing is critical under certain atmospheric
conditions.
Refer to Section
VI
for cold weather equipment.
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