Each person operating an aircraft equipped with ADS-B Out must operate this equipment

• A. at all times at and above 10,000 feet MSL
• B. only in Class C airspace
• C. only when requested by ATC
• D. only above 18,000 feet MSL

Answer: (A)

ADS-B Out broadcasts your aircraft’s position and altitude so ATC can track you accurately. In the United States, this equipment must be operating in the airspace where ADS-B Out is required, which includes Class A, B, C, and E airspace at or above 10,000 feet MSL. Because of that, you need to keep ADS-B Out on at all times when you’re at or above 10,000 feet MSL. It isn’t limited to being on only in Class C, or only when ATC asks, or only above 18,000 feet. This setup ensures continuous, reliable surveillance for safe handling in the higher, more complex parts of the airspace.