FAA Military Competency Practice Exam

What is the primary purpose of a coded transponder in aviation?

1. To manage flight logs

2. To communicate with flight service stations

3. To provide altitude information to air traffic control

4. To assist in navigation

The correct answer is: To provide altitude information to air traffic control

The primary purpose of a coded transponder in aviation is to provide altitude information to air traffic control. This system enhances the situational awareness of both the pilots and air traffic controllers by transmitting a unique code along with the aircraft's altitude information. When the transponder is activated, it responds to radar interrogations from air traffic control radar systems, allowing controllers to track the aircraft’s position, altitude, and identity efficiently. This functionality is crucial for maintaining safe distances between aircraft and managing air traffic effectively, especially in busy airspace. The altitude provided by the transponder enables air traffic control to ensure that aircraft are operating at the appropriate flight levels, thereby preventing potential collisions. Transponders can also provide additional data, such as identification codes, which helps controllers differentiate between multiple aircraft in the same vicinity. Overall, the coded transponder is a vital component in modern aviation safety and operational efficiency.