What FAA Part 139.327 actually requires, and where automated detection fits

Every U.S. airport certificated under FAA Part 139 (meaning it serves scheduled air carrier operations) runs a daily self-inspection program under Section 139.327. That requirement isn't optional, and it isn't vague: airports must inspect runways, taxiways, aprons, and loading ramps to check for and remove foreign object debris (FOD), among other safety conditions, with additional special inspections triggered by construction, accidents, or unusual weather.

The FAA's supporting guidance (Advisory Circular 150/5210-24, covering airport FOD management, and the broader self-inspection AC) frames FOD management as a continuous four-step cycle: prevention, detection, removal, and evaluation. Detection is the step most airports still handle the same way they did decades ago: a person, in a vehicle, doing a visual sweep.

Where the gaps actually happen

Visual inspection catches a lot. What it structurally can't catch is the debris that lands between inspection cycles, in the dark, or in weather that limits visibility, exactly the conditions where FOD risk doesn't go away just because it's harder to see. The FAA's own standard doesn't just ask "was an inspection performed," it implicitly asks whether the inspection method is actually capable of finding what's there.

What continuous, automated detection changes

A vehicle-mounted detection system that runs during an airport's existing patrol routine doesn't replace the self-inspection program; it strengthens the detection step of it. Instead of a fixed number of scheduled sweeps, the airfield gets continuous coverage, with every detection automatically geolocated, timestamped, and logged. That's not just faster; it's a more complete and more auditable record than a manual walk can produce.

This is also precisely the standard Oreyeon's own system has been validated against: RSMS performance was assessed against the FAA's standard for FOD detection equipment, AC 150/5220-24, across day, night, dry, and wet-runway conditions during a formal pilot at a major hub airport in Spain. See the full case study.