Environmental Conditions; Cold Weather Operation; Starting - Cirrus SR22 Pilot Operating Handbook

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IRRUS ESIGN
SR22

Environmental Conditions

Cold Weather Operation

An engine that has been superficially warmed, may start and
appear to run satisfactorily, but can be damaged from lack of
lubrication due to the congealed oil blocking proper oil flow
through the engine. The amount of damage will vary and may not
become evident for many hours. However, the engine may be
severely damaged and may fail shortly following application of
high power. Proper procedures require thorough application of
preheat to all parts of the engine. Hot air must be applied directly
to the oil sump and external oil lines as well as the cylinders, air
intake and oil cooler. Because excessively hot air can damage
non-metallic components such as composite parts, seals, hoses,
and drive belts, do not attempt to hasten the preheat process.

Starting

If the engine has been cold soaked, it is recommended that the propeller be
pulled through by hand several times to break loose or limber the oil. This
procedure will reduce power draw on the battery if a battery start is made.
When the engine has been exposed to temperatures at or below 20 °F (-7
°C) for a period of two hours or more, the use of an external pre-heater and
external power is recommended. Failure to properly preheat a cold-soaked
engine may result in oil congealing within the engine, oil hoses, and oil
cooler with subsequent loss of oil flow, possible internal damage to the
engine, and subsequent engine failure.
If the engine does not start during the first few attempts, or if engine firing
diminishes in strength, the spark plugs have probably frosted over. Preheat
must be used before another start is attempted.
When the oil temperature has reached 100 °F (38 °C) and oil pres-
sure does not exceed 70 psi at 2500 RPM, the engine has been
P/N 13772-006
Reissue A
• CAUTION •
warmed sufficiently to accept full rated power.
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NVIRONMENTAL ONDITIONS
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