What is the general purpose of an aircraft transponder?

What is the general purpose of an aircraft transponder?

• A. Record flight data
• B. Alert ATC of your current location
• C. Provide weather data
• D. Control traffic display

Answer: (B)

Transponders are used to help air traffic control identify and track an aircraft by replying to radar interrogations. When ATC’s radar asks for information, the transponder sends back a code (squawk) and, in most modes, the aircraft’s altitude. Modern transponders (Mode S and ADS-B) can also broadcast additional data, including precise position. This enables ATC to see who you are and where you’re located on their surveillance displays and to manage separation safely. It’s not meant for recording flight data, providing weather data, or controlling the display itself.

Transponders are used to help air traffic control identify and track an aircraft by replying to radar interrogations. When ATC’s radar asks for information, the transponder sends back a code (squawk) and, in most modes, the aircraft’s altitude. Modern transponders (Mode S and ADS-B) can also broadcast additional data, including precise position. This enables ATC to see who you are and where you’re located on their surveillance displays and to manage separation safely. It’s not meant for recording flight data, providing weather data, or controlling the display itself.