Cirrus Design Section 4
SR20 Normal Procedures
P/N 21399-004 4-27P/N 21399-004 4-27
Lead Reduction Before Shut Down
Complete the following procedure before shutdown to reduce potential
for lead build-up in the combustion chamber, spark plugs, and engine
oil.
• Caution •
The airplane must be stationary before the following
procedure is completed.
1. Maintain throttle between 1000 and 1200 RPM until operating
temperature has stabilized.
2. Increase throttle to 1800 RPM for 15 - 20 seconds.
3. Reduce throttle back to between 1000 and 1200 RPM and shut
down immediately using mixture control.
Noise Characteristics/Abatement
The certificated noise levels for the aircraft established in accordance
with FAR 36 Appendix G are:
No determination has been made by the Federal Aviation
Administration that the noise levels of this airplane are or should be
acceptable or unacceptable for operation at, into, or out of, any airport.
The above noise levels were established at 3000 pounds takeoff
weight and 2700 RPM.
Recently, increased emphasis on improving environmental quality
requires all pilots to minimize the effect of airplane noise on the
general public. The following suggested procedures minimize
environmental noise when operating the aircraft.
Configuration Actual Maximum Allowable
Two-blade Propeller 84.79 dB(A) 87.6 dB(A)
Three-blade Propeller 83.42 dB(A) 87.6 dB(A)
Revision A1
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