Environmental Considerations; Cold Weather Operation - Cirrus DESIGN SR20 Information Manual

Cirrus Design
SR20

Environmental Considerations

Cold Weather Operation

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°
Fahrenheit (-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.
If airplane will be started using external power, keep all
personnel and power unit cables well clear of the propeller
rotation plane.
Inadequate application of preheat to a cold soaked engine
may warm the engine enough to permit starting but will not de-
congeal oil in the sump, lines, cooler, filter, etc. Congealed oil
in these areas will require considerable preheat.
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.
P/N 13999-002 Info Manual
September 2011
• WARNING •
• Caution •
(Continued on following page)
Section 4
Normal Procedures
4-25