Curious Kids: what's the history of aircraft squawk codes and how do they work?
- Written by Andrew Dowse, Director, Defence Research and Engagement, Edith Cowan University
Perth air traffic control tower. As a pilot flies towards the destination, the air traffic control tower sends an interrogation signal. The aircraft automatically responds with a series of short pulses that let air traffic control know the identity of the plane and its altitude.© Copyright Airservices Australia
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