Special Missions Aviation (SMA) Block 1 Practice Test

Which IFF transponder mode provides altitude reporting?

Mode C Mode A Mode S Mode 4

Correct Answer:

Mode C

Explanation:

Altitude reporting is a function of Mode C. When interrogated, the transponder replies with an encoded altitude value (pressure altitude), allowing ATC to see your aircraft’s altitude on the radar display. Mode A only provides an identification code with no altitude data. Mode S carries more data and can include altitude, but the standard, textbook way to obtain an aircraft’s altitude in many civilian operations is through Mode C. Mode 4 is a military, encrypted code and does not provide altitude information.

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