Under 14 CFR § 107.51(d), the minimum distance of a small unmanned aircraft from clouds must be no less than —

Why: 14 CFR § 107.51(d) requires the small unmanned aircraft to remain at least 500 feet below and 2,000 feet horizontally from any cloud.

• 1,000 feet below / 1 statute mile horizontal is the manned-aviation VFR cloud-clearance figure for some airspace classes; it is not the part 107 small-UAS requirement.
• Part 107's cloud clearance is measured below and horizontally from the cloud, not above it, and the horizontal figure of 1,000 feet does not match § 107.51(d)'s 2,000 feet.