What must UAVs operating in civil airspace have?

UAVs (Unmanned Aerial Vehicles) operating in civil airspace must have an N-Number, which is a unique identifier assigned by the Federal Aviation Administration (FAA) to manned and unmanned aircraft registered in the United States. This registration process enhances airspace safety and accountability, allowing for better tracking and management of UAV operations. The N-Number signifies the aircraft is recognized and adheres to regulatory standards set forth by the FAA.

This requirement is essential for legal operation within the controlled airspace, ensuring compliance with aviation regulations. Other options like a payload capacity that is exceeded, having no restrictions, or the existence of blind spots do not correlate with operational regulations and requirements for UAVs in civil airspace, making them unsuitable choices for this question.