[XPDR] In addition to Mode A squawk code, what other information is transmitted by a Mode C transponder?

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The question asks what information, in addition to the Mode A squawk code, is transmitted by a Mode C transponder.
Option 1: Aircraft type. This is not transmitted by a Mode C transponder. Aircraft type is not part of the Mode C reply and would require additional data links or Mode S capabilities to convey.
Option 2: Aircraft position. While ADS-B and certain Mode S capabilities can provide position information, a classic Mode C transponder reply does not include aircraft position data. Position is typically derived from other technologies or systems, not the standard Mode C reply.
Option 3: Altitude. This is the key piece of data associated with Mode C. The Mode C reply includes a 12-bit (or similar) encoding of the aircraft’s pressure altitude, supplementing the basic Mode A code. This is the core additional information that Mode C provides beyond Mode A.
Option 4: Identification code. The identification code (squawk code) is part of Mode A, not Mode C. The Mode C reply adds altitude information, not a separate identification code.
Across the options, only altitude corresponds to the data uniquely carried by Mode C in addition to the Mode A code. The other items do not form part of the standard Mode C reply in typical radar transponder operation.

25F --Aircraft Navigation Systems (SEC. 501) FINAL Exam ATAC 506 - W25 - Requires Respondus LockDown Browser 25F --Aircraft Navigation Systems (SEC. 501) FINAL Exam ATAC 506 - W25 - Requires Respondus LockDown Browser

[XPDR] In addition to Mode A squawk code, what other information is transmitted by a Mode C transponder?

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