Where is ADS-B Out required?

The requirement for ADS-B Out is specifically tied to certain flight altitudes and types of airspace as mandated by the FAA. The correct answer reflects the requirement for ADS-B Out to be operational above 10,000 feet MSL (Mean Sea Level) but below 2,500 feet AGL (Above Ground Level).

This regulation is designed to enhance situational awareness and improve safety in crowded airspaces by enabling more precise tracking of aircraft. The requirement is not in effect below 10,000 feet MSL in many scenarios, especially in less controlled airspace, which is why the altitudes specified are crucial for understanding when ADS-B Out must be activated.

In terms of the other options, they do not accurately reflect the FAA's regulations regarding ADS-B Out. For instance, while operations in Class D airspace might necessitate certain equipage, the requirement for ADS-B Out is broader and not limited to specific airspace classifications. Similarly, the stipulations regarding flying at or above 3,000 feet or below 2,500 feet AGL do not align with the defined regulations that mandate ADS-B Out usage specifically at the higher altitude range stated in the correct answer.