What is the minimum altitude for safe operation of a sUAS in uncontrolled airspace?

The minimum altitude for safe operation of a small Unmanned Aircraft System (sUAS) in uncontrolled airspace is 400 feet Above Ground Level (AGL). This altitude is established primarily to ensure that the sUAS remains above ground obstacles and other air traffic, particularly manned aircraft that may be operating in the area below this altitude. Operating at or below 400 feet AGL helps mitigate the risk of collisions with other aircraft and allows for better situational awareness for the remote pilot.

In addition, 400 feet AGL is consistent with the regulations set forth by the Federal Aviation Administration (FAA), which aim to maintain a safe operating environment. Above this altitude, there is a greater likelihood of encountering manned aircraft, particularly helicopters and smaller airplanes, which could increase the potential for mid-air collisions.