FAA Ground School Practice Test

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What mode is an operable 4096-code transponder required to have in Class B airspace?

Mode A
Mode B
Mode C
Mode D

The correct answer is: Mode C

In Class B airspace, an operable 4096-code transponder is required to operate in Mode C. This mode provides altitude encoding along with the aircraft’s identification code. Mode C transponders transmit information about the altitude of the aircraft, which is crucial for air traffic control when managing the high volume of traffic typically present in Class B airspace. This altitude awareness allows controllers to maintain safe vertical separation between aircraft, as well as coordinate their movements. Modes A and D do not provide altitude information, making them insufficient for the operational needs of Class B airspace. Mode A only transmits the aircraft's identification code, while Mode D is a non-altitude reporting mode intended for certain radar applications. Therefore, the requirement for Mode C ensures a higher level of safety and situational awareness in densely populated airspace.