Above which flight level may ADS-B Out be required?

Above which flight level may ADS-B Out be required?

• A. FL290
• B. FL180
• C. FL410
• D. FL100

Answer: (A)

ADS-B Out is required to improve surveillance in high-altitude en-route airspace where radar coverage is limited. The altitude level chosen for many regions is 29,000 feet (flight level 290), so above this level aircraft must broadcast their position and velocity via ADS-B Out. This ensures ATC can reliably track aircraft on long-range routes and maintain safe separation, even where traditional radar isn’t as effective. Below this altitude, radar and other surveillance methods cover most airspace, so the mandatory use of ADS-B Out is not universally imposed.

ADS-B Out is required to improve surveillance in high-altitude en-route airspace where radar coverage is limited. The altitude level chosen for many regions is 29,000 feet (flight level 290), so above this level aircraft must broadcast their position and velocity via ADS-B Out. This ensures ATC can reliably track aircraft on long-range routes and maintain safe separation, even where traditional radar isn’t as effective. Below this altitude, radar and other surveillance methods cover most airspace, so the mandatory use of ADS-B Out is not universally imposed.