Environmental Considerations; Cold Weather Operation; Revision 1 - Cirrus SR22 Pilot Operating Handbook

Cirrus Design
SR22

Environmental Considerations

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 drives 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 pressure
does not exceed 70 psi at 2500 RPM, the engine has been warmed
sufficiently to accept full rated power.
P/N 13772-004 P/N 13772-004

Revision 1

• Caution •
• Note •
Section 4
Normal Procedures
4-25 4-25