Transponder Codes Made Easy: A Pilot’s Survival List
Pilot Institute
FEBRUARY 28, 2025
Pilots and ATCs daily use transponder codes, also known as squawk codes. If you can manage to do so without putting yourself at risk after leaving your last cleared routing, you should: Maintain a true airspeed of no more than 400knots and preferably an altitude between 10,000 and 25,000feet.
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