14 CFR 107.31 — Visual Line of Sight Aircraft Operation
The remote PIC or visual observer must maintain visual line of sight with the drone at all times during flight.
Regulation Text
The remote pilot in command, the person manipulating the flight controls, and the visual observer must be able to see the unmanned aircraft throughout the entire flight in order to: know the unmanned aircraft's location; determine the unmanned aircraft's attitude, altitude, and direction of flight; observe the airspace for other air traffic or hazards; and determine that the unmanned aircraft does not endanger the life or property of another.
Note: This is an excerpt. Refer to the full regulation in eCFR for the complete text.
Plain-English Explanation
You must be able to see your drone at all times — this is the Visual Line of Sight (VLOS) rule. Either the remote PIC or a visual observer must maintain unaided visual contact (no binoculars). This means you can see the drone well enough to know where it is, which direction it is going, and spot any hazards nearby. Beyond Visual Line of Sight (BVLOS) operations require a waiver and are one of the most commonly requested Part 107 waivers for operations like infrastructure inspection.
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Related Regulations
14 CFR 107.29 — Daylight Operation
Small UAS may only be operated during daylight or civil twilight with anti-collision lighting visible for 3 statute miles.
§107.5114 CFR 107.51 — Operating Limitations for Small Unmanned Aircraft
Maximum altitude 400 feet AGL, maximum speed 100 mph (87 knots), maximum weight 55 pounds, minimum visibility 3 statute miles.
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