FAA Tower Lighting Requirements and Marking Standards

FAA tower lighting requirements apply to any structure taller than 200 feet above ground level, and to shorter structures that sit close enough to an airport or heliport to penetrate protected airspace. The FAA doesn’t hand out a one-size checklist. You file a notice, the agency studies your structure, and the determination letter tells you exactly which lights and paint scheme to install. The standards themselves come from Advisory Circular 70/7460-1M, and for antenna towers the FCC makes those standards legally enforceable.

When Your Structure Triggers FAA Notice

Under 14 CFR 77.9, you must file notice with the FAA before building or altering a structure that meets any of these thresholds:

More than 200 feet above ground level at its site, anywhere in the country.
Penetrates a 100-to-1 imaginary surface within 20,000 feet of a runway longer than 3,200 feet.
Penetrates a 50-to-1 surface within 10,000 feet of a runway 3,200 feet or shorter.
Penetrates a 25-to-1 surface within 5,000 feet of a heliport landing area.

Those slope ratios pull in much shorter structures than the 200-foot rule alone would suggest. A 50-foot building near a major airport can easily cross the imaginary surface. The FAA can also request notice for any structure it considers relevant even if the numeric thresholds aren’t met.¹

Notice is separate from being formally classified an obstruction. A structure becomes an obstruction under 14 CFR 77.17 if it exceeds 499 feet AGL, or exceeds 200 feet within 3 nautical miles of an airport with a runway over 3,200 feet. Structures near instrument flight procedures or federal airways can be classified as obstructions at any height if they cut into required clearance.²

Filing Form 7460-1 and Getting a Determination

The notice itself is FAA Form 7460-1, Notice of Proposed Construction or Alteration. File it at least 45 days before construction begins or before you apply for a construction permit, whichever is earlier. If the structure also needs an FCC license, the FAA notice has to be filed on or before the FCC application.³

The form asks for the geographic coordinates, height above ground level, and elevation above mean sea level. Filing is done electronically through the FAA’s Obstruction Evaluation / Airport Airspace Analysis (OE/AAA) portal.⁴

The filing triggers an aeronautical study. The FAA models the structure’s effect on navigable airspace, air traffic procedures, radar systems, and instrument approaches, then issues a determination. Most tower projects that make it through this process receive a Determination of No Hazard that spells out the required lighting and marking. Interested parties have 30 days to petition for review, and the determination becomes final after 40 days if no petition is filed.⁵

The determination letter, not the Advisory Circular in the abstract, is what controls the specific lights and paint on your structure. The AC sets the menu; the determination picks from it.

Lighting Types by Height

Advisory Circular 70/7460-1M defines the standard fixtures by their L-designation. Which one applies depends mostly on height.

L-810 low-intensity steady red lights, for structures 150 feet AGL or less. Installed at or near the top with enough units for at least one to be visible from any direction.
L-864 medium-intensity flashing red lights, for structures taller than 150 feet AGL. Additional tiers appear at intermediate levels on structures above 350 feet.
L-865 medium-intensity flashing white lights, providing day and night visibility. Not normally recommended for structures 200 feet or less, and often paired with red lights in a dual system.

High-intensity flashing white systems are reserved for the tallest structures and generally shouldn’t appear on anything 700 feet AGL or less unless an aeronautical study says otherwise. When high-intensity white lights run 24 hours a day, paint marking isn’t required, because the strobes are considered more conspicuous than paint in most ambient light.⁶

Dual Lighting Systems

In populated areas, all-night white strobes generate complaints. The dual system uses medium-intensity white L-865 during day and twilight and switches to red L-864 at night, with a photocell running the transition. The two systems can’t operate simultaneously, and the switchover gap can’t exceed 2 seconds. If the top red light fails at night, the white system must activate automatically as a backup.⁶

Paint Marking Standards

Structures lit only with red obstruction lights at night generally need daytime paint marking in alternating bands of aviation orange and white. The colors have to match Federal Standard 595: color 12197 for aviation orange, color 17875 for white.

There is no fixed repaint schedule. The AC directs owners to repaint whenever the color has visibly changed or the markings show scaling, oxidation, chipping, or contamination. Most owners inspect the paint at least once a year given how quickly outdoor coatings weather.⁶

Daily Monitoring and Outage Reporting

Installing the lights is the easy part. Keeping them running is where compliance gets expensive.

You have to confirm every 24 hours that all obstruction lights are working. That can be a visual check or an automatic monitoring system capable of detecting any light failure regardless of position or color. If a remote monitoring device is used, its communication and operational status must be verified at least daily. The FAA also recommends keeping a log of the lighting system’s daily status.⁷

If any top light or flashing obstruction light fails and isn’t corrected within 30 minutes, call the FAA’s NOTAM line at 877-487-6867 immediately so a Notice to Air Missions can be issued. The report has to include the condition of the light, the cause of failure, the estimated repair date, and the structure’s registration number. If the repair drags past the initial NOTAM period, contact the FAA again to extend the outage notice with an updated return-to-service date, and keep doing so until the lights are back.⁷

Light fixture lenses need a visual inspection every 24 months for UV damage, cracks, crazing, and dirt buildup that can reduce certified output.⁶

Aircraft Detection Lighting Systems

An Aircraft Detection Lighting System uses sensors to detect approaching aircraft and turns the obstruction lights on only when needed, cutting light pollution and energy use. If an ADLS component fails, the system must automatically switch all obstruction lights to full-time operation under the standard AC requirements until it’s fully restored.⁷

FCC Registration Makes the Rules Enforceable for Antenna Towers

The FAA’s Advisory Circular is technically guidance, and the FAA has limited direct authority to fine owners who ignore its lighting recommendations. For antenna structures, the FCC closes that gap.

The FCC requires registration of any antenna structure taller than 200 feet AGL or one that could interfere with a nearby airport’s flight path, unless a specific exemption under 47 CFR 17.7(e) applies.⁸ Under 47 CFR 17.23, the painting and lighting specified in the FAA’s Determination of No Hazard become mandatory for those registered structures.⁹

The FCC’s monitoring rules mirror the FAA’s but sit in binding regulation. Owners must inspect lights at least once every 24 hours visually or by automatic indicator, or maintain an automatic alarm system. Automatic or mechanical control devices, indicators, and alarm systems must be inspected at least every 3 months. Any top or flashing light failure not corrected within 30 minutes must be reported to the FAA for a NOTAM with the same outage details and repair timeline.¹⁰

The FCC’s Enforcement Bureau has issued fines of $25,000 and higher for tower lighting and maintenance violations.¹¹

Flashing Red Marker Lights for Bird Safety

Steady-burning red lights attract migratory birds, which then collide with towers and guy wires. Advisory Circular 70/7460-1M addresses this by requiring avian-friendly configurations on new tower filings. Structures that previously used steady L-810 red marker lights must use the flashing version, designated L-810F.

For structures between 150 and 350 feet, the L-810F marker lights flash in unison with the L-864 red beacon at 30 flashes per minute. On structures taller than 350 feet with multiple beacon tiers, the L-810 marker tiers can be removed entirely. The requirement does not apply to shorter structures (typically 150 feet or under) using two L-810 marker lights on top that don’t rely on guy wires, since those structures pose less risk to birds.⁶

If you own an older guyed tower with steady red lights installed before the requirement took effect, the FAA expects conversion to the flashing configuration when the lighting system is next updated or when a new aeronautical study is filed for the structure.

1
eCFR. 14 CFR 77.9 – Construction or Alteration Requiring Notice
2
eCFR. 14 CFR 77.17 – Obstruction Standards
3
eCFR. 14 CFR 77.7 – Form and Time of Notice
4
Federal Aviation Administration. Obstruction Evaluation / Airport Airspace Analysis
5
Federal Aviation Administration. Chapter 7 – Determinations
6
Federal Aviation Administration. Advisory Circular AC 70/7460-1M – Obstruction Marking and Lighting
7
Federal Aviation Administration. Advisory Circular AC 70/7460-1M Change 1 – Obstruction Marking and Lighting
8
Federal Communications Commission. Antenna Structure Registration (ASR) Resources
9
eCFR. 47 CFR Part 17 – Construction, Marking, and Lighting of Antenna Structures
10
eCFR. 47 CFR 17.48 – Notification of Extinguishment or Improper Functioning of Lights
11
Federal Communications Commission. EB Imposes $25,000 Fine for Tower Lighting and Maintenance Violations