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What an infrastructure operator should do about unauthorized drones
Build a response around people, procedures, and coordination—not a single device. CISA recommends understanding the air domain around a facility, updating incident plans, working with government partners, and reporting potential threats to local law enforcement. Its DHS/CISA fact sheet, Unmanned Aircraft Systems: Addressing Critical Infrastructure Security Challenges (February 2017), notes that no single solution fully addresses the risk.
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UAS can have legitimate uses, but agency guidance also identifies possible malicious uses such as carrying a payload, surveillance or reconnaissance, intellectual-property theft, and disruption or harassment. These are threat categories, not evidence that a particular sighting is hostile or a measure of how often attacks occur. CISA’s Be Air Aware program provides resources for staff awareness, threat recognition, and preparedness.
How to prepare a site and its response
- Map the operating environment. Document the facility boundary, sensitive assets, surrounding airspace, likely approach areas, existing security systems, and local emergency contacts. Identify which agencies and officials have relevant authority.
- Set a staff reporting procedure. Tell employees how to report a sighting, who receives the report, and how to preserve useful observations—such as time, location, direction of travel, and what they saw—without approaching the aircraft. FAA public-safety guidance describes investigation and reporting procedures for law enforcement.
- Protect people and keep operations coordinated. Define who assesses the situation, who can direct protective actions under the facility’s existing plans, and how information reaches incident leadership and relevant authorities. Do not ask untrained staff to approach, seize, or interfere with an aircraft.
- Update and rehearse incident plans. Add UAS scenarios to emergency or incident-action plans. Rehearse reporting and coordination with federal, state, local, and tribal partners, as applicable to the site.
- Report and document potential threats. Use local law enforcement and relevant agency channels, and retain observations for follow-up. FAA’s public-safety materials provide related resources for public-safety agencies.
What drone detection can—and cannot—tell you
FAA describes detection systems ranging from commercial off-the-shelf equipment to custom integrated systems. They may use one or more sensor types. Detection can alert staff and support investigation, but FAA cautions that these systems cannot determine a drone’s intent or threat level. Build in human review and a clear escalation path instead of treating a sensor alert as an automatic hostile classification.
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| Detection approach | What the FAA guidance establishes | Questions for site evaluation |
|---|---|---|
| Radar | One of the primary sensor types used in UAS detection systems. | What area can the proposed installation cover, and how will detections be validated and routed to responders? |
| Radio frequency (RF) | One of the primary sensor types; systems may use it alone or with other sensors. | How does the system fit the site’s operating environment, and what process handles alerts that need corroboration? |
| Electro-optical | One of the primary sensor types; it can be combined with other technologies for primary detection or secondary validation. | How will staff review an observation, and what conditions or site features affect the intended coverage? |
| Acoustic | One of the primary sensor types; it may form part of a combined detection system. | How will this sensor contribute to validation, and what other information will responders use before escalating? |
These categories are not a performance ranking. The cited FAA material does not establish comparative accuracy, price, or a best sensor for every facility. Evaluate coverage, validation, nuisance alerts, communications, alert delivery, and the ability of trained staff to act on information. A single sensor or system should not be treated as eliminating risk.
How to evaluate detection for a particular facility
- Start with the site and operating need. Define what staff need to know, which areas require awareness, who will review alerts, and how a report leads to a decision.
- Assess integration and validation. Determine whether sensors operate independently or in combination, how detections are corroborated, and how alerts reach trained responders.
- Consider airspace and nearby equipment. For airports, FAA identifies legal considerations, possible electromagnetic interference with communication and navigation equipment, and airspace case processing as relevant. Airport operators planning detection should coordinate with their FAA Airports District Office or Regional Office. This is airport-specific guidance, not a universal permit process for every facility.
- Coordinate before procurement and deployment. Confirm site-specific restrictions, operational constraints, agency contacts, and the proposed system’s documented performance in the facility’s environment. The appropriate system cannot be selected without the site’s jurisdiction, threat model, operating conditions, existing sensors, and agency partners.
Why detection is different from counter-drone mitigation
Detection observes and reports; mitigation attempts to affect the aircraft. FAA describes mitigation measures as potentially disrupting, disabling, destroying, seizing control of, or providing alternate flight instructions to a UAS. Those actions can implicate aviation and other legal restrictions.
FAA says it does not support C-UAS use by entities other than the federal departments of Defense, Homeland Security, Justice, and Energy when they have explicit statutory authority. Its guidance points non-federal public and private entities to an interagency advisory on applicable federal laws. Do not treat jammers, takeover equipment, or other active countermeasures as ordinary facility-owner purchases or actions. Authority depends on the responsible entity, facility, and applicable law; site decisions call for coordination with authorized federal agencies, aviation officials, law enforcement, and legal counsel.
Which facilities have drone flight restrictions?
Some designated national-security-sensitive locations have specific restrictions. FAA states that drones are prohibited from flying over designated sites from the ground up to 400 feet above ground level; examples include military bases, national landmarks, and certain critical infrastructure such as nuclear power plants. This does not mean every power plant, bridge, port, pipeline, or other infrastructure site automatically has the same restriction. Check whether the specific location is designated rather than inferring a restriction from the facility type.
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