Private Pilot Private Exam

An operable 4096 code transponder with an encoding altimeter is required in which airspace?

1. Class A, Class B, and Class C

2. Only in Class A airspace

3. Class D only

4. Only during nighttime operations

The correct answer is: Class A, Class B, and Class C

An operable 4096 code transponder with an encoding altimeter is required in specific classes of airspace to ensure safe and effective air traffic management. In Class A airspace, which typically extends from 18,000 feet up to and including flight level 600 (FL 600), the use of a transponder is mandatory. This is to enhance surveillance and provide separation from other aircraft. Class B airspace, which surrounds busy airports, also requires the use of a transponder with an encoding altimeter. This ensures that air traffic controllers can effectively monitor and integrate all aircraft operating within this high-traffic area, enhancing safety. Class C airspace, which includes airports with a moderate level of air traffic and typically requires communication with air traffic control, also mandates the use of a transponder with altitude encoding to assist in both traffic separation and situational awareness. Given this requirement across these airspace categories, the answer that specifies that an operable 4096 code transponder with an encoding altimeter is needed in Class A, Class B, and Class C airspaces is indeed correct. This regulation is essential for maintaining safety and efficiency in the National Airspace System.