UA.II.B.K10: sUAS lighting requirements.

ACS Area II — Airspace Classification and Operating Requirements Task B: Airspace Operational Requirements References: 14 CFRCode of Federal RegulationsCloseThe federal rulebook where Part 107, Part 89, Part 48, and other aviation rules live. part 71; ACAdvisory CircularCloseFAA guidance that explains acceptable ways to comply with rules or understand FAA procedures. 107-2; AIMAeronautical Information ManualCloseFAA operational guidance and glossary material used to understand aviation procedures and terminology.; FAAFederal Aviation AdministrationCloseThe U.S. aviation regulator responsible for Part 107 rules, airspace, and pilot certification processes.-H-8083-25; FAAFederal Aviation AdministrationCloseThe U.S. aviation regulator responsible for Part 107 rules, airspace, and pilot certification processes.-G-8082-22; SAFOSafety Alert for OperatorsCloseFAA safety alert that shares operational safety information. 10015

Key Concepts

Why lighting matters: “see and avoid” in busy airspace

Lighting on a small UASSmall Unmanned Aircraft SystemCloseA small drone plus the control and communication links used to operate it. enhances conspicuity, directly supporting the FAAFederal Aviation AdministrationCloseThe U.S. aviation regulator responsible for Part 107 rules, airspace, and pilot certification processes.’s long‑standing “see and avoid” mandate that applies to pilots operating under the general operating and flight rules in the CFRCode of Federal RegulationsCloseThe federal rulebook where Part 107, Part 89, Part 48, and other aviation rules live.. In practical terms, better conspicuity helps manned pilots visually acquire your aircraft sooner, reducing collision risk, especially in traffic‑dense environments and around airports.^[7]

Class B airspace typically has the highest traffic density. It generally extends from the surface to 10,000 feet MSLMean Sea LevelCloseAltitude measured from average sea level, not from the ground below you. around the nation’s busiest airports, requires an ATCAir Traffic ControlCloseThe system that manages controlled airspace, traffic flow, and aircraft separation services. clearance for entry, and uses a “clear of clouds” VFRVisual Flight RulesCloseRules for flight using visual reference and minimum weather conditions. cloud clearance standard.^[4] High traffic volume plus minimal cloud clearance margin means visual detection is critical—lighting improves your odds of being seen. Class C areas also concentrate traffic and require two‑way radio communication prior to entry; furthermore, there is a procedural Outer Area normally 20 NMNautical MileCloseA distance unit used in aviation. One nautical mile is about 1.15 statute miles. from the primary Class C airport (not charted), within which radar/radio services may affect operations—another cue that conspicuity is important on arrival or transit.^[8]

Class D locations still feature significant traffic, including faster aircraft. By rule, within 4 NMNautical MileCloseA distance unit used in aviation. One nautical mile is about 1.15 statute miles. of the primary airport and at or below 2,500 feet above the surface, aircraft may not exceed 200 knots unless otherwise authorized or required by ATCAir Traffic ControlCloseThe system that manages controlled airspace, traffic flow, and aircraft separation services..^[5] Even at these reduced speeds, closing rates remain high; lighting helps manned traffic detect you in time to maneuver.

Where controlled airspace starts at the surface (and why you care)

Controlled airspace can begin at the surface, which often indicates instrument procedure traffic close to the ground. Class E is the “everywhere else” controlled airspace not classified as A, B, C, or D. In most areas, the Class E base is 1,200 feet AGLAbove Ground LevelCloseAltitude measured above the ground directly below the aircraft.; in many areas it is either the surface or 700 feet AGLAbove Ground LevelCloseAltitude measured above the ground directly below the aircraft.; in some places it begins at an MSLMean Sea LevelCloseAltitude measured from average sea level, not from the ground below you. altitude depicted on charts. Class E typically extends up to, but not including, 18,000 feet MSLMean Sea LevelCloseAltitude measured from average sea level, not from the ground below you., and all airspace above FLFlight LevelCloseAltitude expressed using a standard pressure setting, mainly relevant to higher-altitude crewed aviation. 600 is Class E.^[2] When Class E goes to the surface, IFRInstrument Flight RulesCloseRules for operating primarily by instruments. On the exam, IFR often appears in weather, traffic, and airspace context. traffic may be operating low, often in poor visibility—again, a strong operational cue to maximize conspicuity with lighting.

Class G (uncontrolled) extends from the surface to the base of the overlying Class E airspace. Although ATCAir Traffic ControlCloseThe system that manages controlled airspace, traffic flow, and aircraft separation services. does not provide separation services in Class G, VFRVisual Flight RulesCloseRules for flight using visual reference and minimum weather conditions. minimums still apply to manned aircraft and traffic may be present.^[2] Do not assume “uncontrolled” means “unused”—lighting remains a prudent risk‑reduction tool for see‑and‑avoid in mixed‑use environments.

Airport environments and traffic flows that drive lighting decisions

At some airports, the control tower does not operate 24 hours. During hours when the tower is closed, Class D surface areas may revert to Class E at the surface or a combination of Class E (to 700 feet AGLAbove Ground LevelCloseAltitude measured above the ground directly below the aircraft.) and Class G (to the surface), as published in the Chart Supplement U.S.^[5] Traffic does not disappear when the tower closes—maintain high conspicuity, especially near runways or approach paths.

Under and around Class B, pilots often use VFRVisual Flight RulesCloseRules for flight using visual reference and minimum weather conditions. Flyways depicted on Terminal Area Charts to avoid major traffic flows; these areas can still be congested. In a few places, VFRVisual Flight RulesCloseRules for flight using visual reference and minimum weather conditions. Corridors (a “hole” through Class B with defined boundaries) allow flight without ATCAir Traffic ControlCloseThe system that manages controlled airspace, traffic flow, and aircraft separation services. clearance; these too can be busy.^[6] Expect significant mixing of aircraft performance and pilot experience levels in these corridors and flyways—another reason to use lighting to aid early visual acquisition.

Finally, know the broader structure of the National Airspace System so you can anticipate where manned aircraft concentrate. Class A spans from 18,000 feet MSLMean Sea LevelCloseAltitude measured from average sea level, not from the ground below you. up to and including FLFlight LevelCloseAltitude expressed using a standard pressure setting, mainly relevant to higher-altitude crewed aviation. 600, including airspace over waters within 12 NMNautical MileCloseA distance unit used in aviation. One nautical mile is about 1.15 statute miles. of the coast; operations there are IFRInstrument Flight RulesCloseRules for operating primarily by instruments. On the exam, IFR often appears in weather, traffic, and airspace context. only under 14 CFRCode of Federal RegulationsCloseThe federal rulebook where Part 107, Part 89, Part 48, and other aviation rules live. sections 91.167 through 91.193.^[4] While this altitude band is well above typical small UASSmall Unmanned Aircraft SystemCloseA small drone plus the control and communication links used to operate it. operations, understanding that Class E occupies the airspace above FLFlight LevelCloseAltitude expressed using a standard pressure setting, mainly relevant to higher-altitude crewed aviation. 600 and that large portions of the NASNational Airspace SystemCloseThe shared U.S. airspace system that drones must operate within. are controlled helps you plan for mixed‑use conditions below—where lighting makes you easier to see.^[1][2]

Key exam cues:

• Class B: surface to 10,000 feet MSLMean Sea LevelCloseAltitude measured from average sea level, not from the ground below you.; ATCAir Traffic ControlCloseThe system that manages controlled airspace, traffic flow, and aircraft separation services. clearance; “clear of clouds.”^[4]
• Class C: two‑way radio before entry; Outer Area normally 20 NMNautical MileCloseA distance unit used in aviation. One nautical mile is about 1.15 statute miles. (not charted).^[8]
• Class D: ≤200 knots at or below 2,500 feet AGLAbove Ground LevelCloseAltitude measured above the ground directly below the aircraft. within 4 NMNautical MileCloseA distance unit used in aviation. One nautical mile is about 1.15 statute miles. of the primary airport.^[5]
• Class E: typical bases (surface/700/1,200 AGLAbove Ground LevelCloseAltitude measured above the ground directly below the aircraft.); up to but not including 18,000 feet MSLMean Sea LevelCloseAltitude measured from average sea level, not from the ground below you.; above FLFlight LevelCloseAltitude expressed using a standard pressure setting, mainly relevant to higher-altitude crewed aviation. 600 is Class E.^[2] Use these to identify where traffic density and proximity to the surface make lighting a high‑value risk‑mitigation measure in sUASSmall Unmanned Aircraft SystemCloseA small drone plus the control and communication links used to operate it. operations.