An operable 4096-code transponder and Mode C encoding altimeter are required in
A
Class B airspace and within 30 miles of the Class B primary airport.✓ Correct Answer
B
Class D airspace.
C
Class E airspace below 10,000 feet MSL.
Explanation
14 CFR 91.215(b) requires an operable transponder with Mode C altitude reporting in Class A, B and C airspace and within 30 nautical miles of Class B primary airports (the Mode C veil), from the surface to 10,000 feet MSL. It is not required in Class D, or in Class E below 10,000 feet MSL outside those areas.
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