An operable 4096-code transponder with an encoding altimeter is required in which airspace?
A
Class A, Class B (and within 30 miles of the Class B primary airport), and Class C.✓ Correct Answer
B
Class D and Class E (below 10,000 feet MSL).
C
Class D and Class G (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. It is not generally required in Class D or in Class E and G below 10,000 feet MSL outside those areas.
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