Cessna 1980 182Q Pilot's Operating Handbook And Flight Manual page 222

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AM/FM CASSETTE STEREO
(TYPE EC-100)
PILOT'S OPERATING HANDBOOK
SUPPLEMENT
SECTION 5
PERFORMANCE
There is no change to the airplanes performance when this avionics
equipment is installed. However, the installation of an externally mounted
antenna or several related external antennas will result in a minor
reduction in cruise performance.
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1 October 1979