P/N 23020-002 7-13
Cirrus SR20 and SR22 Flight Operations Manual
Section 7 Supplementary Information
Thunderstorm Flying
Never regard a thunderstorm lightly - even when radar observers
report the echoes are of light intensity. Avoiding thunderstorms is the
best policy. The following are some Do's and Don'ts of thunderstorm
avoidance:
• Don't land or takeoff in the face of an approaching
thunderstorm. A sudden gust front or low level turbulence could
cause loss of control.
• Don't attempt to fly under a thunderstorm even if you can see
through to the other side. Turbulence and wind shear under the
storm could be disastrous.
• Don't trust the visual appearance to be a reliable indicator of
the turbulence inside a thunderstorm.
• Avoid by at least 20 miles any thunderstorm identified as severe
or giving an intense radar echo. This is especially true under
the anvil of a large cumulonimbus.
• Circumnavigate the entire area if the area has 6/10
thunderstorm coverage.
• Remember that vivid and frequent lightning indicates the
existence of a strong thunderstorm.
Regard as extremely hazardous any thunderstorm with tops
35,000 feet or higher, whether the top is visually sighted or
determined by radar.
Temperature Minimums
Flight training operations should not be undertaken when the outside
air temperature falls below -20 Fahrenheit. Cirrus aircraft should be
preheated if exposed to ground temperatures below 20 Fahrenheit for
more than two hours. Do not operate the engine at speeds above 1700
RPM unless oil temperature is 75 Fahrenheit or higher and oil
pressure is within specified limits of 30-60 PSI. When oil temperature
has reached 100 Fahrenheit and oil pressure does not exceed 60 PSI
at 2500 RPM, the engine has been warmed sufficiently to accept full
rated power.
June 2008
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