Multiple choice

Mode C transponder transmits which of the following information?

  1. Altitude

  2. Weight of airplane

  3. Cloud coverage

  4. Traffic in vicinity
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Mode C transponders automatically transmit pressure altitude information to air traffic control radar systems. This allows ATC to see both your position and your altitude on their displays. Mode A transponders only transmit a 4-digit code, while Mode S transponders provide even more detailed information. Altitude encoding is the key feature that distinguishes Mode C from basic Mode A.

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