Heliport Beacon

A Heliport Beacon is a rotating or flashing light system used to identify a heliport to pilots. It produces a repeating sequence of green, yellow, and white flashes to distinguish it from other airport beacons. The beacon is typically mounted on a mast, control tower, or rooftop, and is visible from a distance of several nautical miles. It serves as the primary visual cue for pilots to locate the helipad during night operations and low‑visibility conditions. The colour sequence and flash pattern are specified by ICAO and FAA to ensure unambiguous identification.

The heliport beacon exists to solve a location problem distinct from a fixed-wing airport's: helipads are frequently small, unlit rooftop or ground-level sites with no runway lighting system to guide a pilot in from distance, so the beacon alone often carries the entire burden of making the site findable at night. Its colour sequence is deliberately chosen to be distinguishable from the standard airport beacon pattern, so a pilot searching visually for a helipad isn't misled toward a nearby fixed-wing airport beacon that happens to be in the same general direction. Because helipads are frequently located in urban or otherwise visually cluttered environments, the beacon's purpose is concentrated on cutting through that clutter with an unambiguous, standardized signal rather than relying on the site's surroundings to make it identifiable.

Installed at all heliports that support night operations or low‑visibility approaches. Used on hospital helipads, offshore platforms, corporate heliports, military helipads, and emergency service heliports. Typically mounted on a mast, control tower, or rooftop at an elevated position to ensure maximum visibility. The beacon is often supplemented by a secondary beacon for larger heliports or where obstructions may block the primary beacon's line of sight.

The beacon is mounted on a mast, control building, or rooftop at the highest practical point on or near the heliport, positioned so its light is not blocked by nearby buildings, trees, or other obstructions in any direction a pilot might approach from. Siting takes into account the heliport's approach and departure paths, keeping the beacon and its supporting structure clear of the obstacle-free surfaces defined for the site. Where the primary beacon's line of sight could be blocked from certain directions, a secondary beacon is installed at a location that covers the shadowed sector. Power and control cabling runs back to a nearby controller and photocell, sized for the beacon's duty cycle, with the mast or mounting structure itself designed to withstand the site's wind loading and, for rooftop installations, tied into the building's structural grid rather than a lightweight parapet.

The heliport beacon operates similarly to an airport beacon but with a different colour sequence. It uses a rotating assembly with lamps (or LEDs) and coloured filters (green, yellow, and white). The rotation speed is typically 12–15 RPM, producing 30–45 flashes per minute. The light source is a high‑intensity halogen lamp or LED array, with a parabolic reflector to produce a narrow, intense beam. The beacon is powered from the heliport's electrical supply with backup battery or UPS to ensure continuous operation. A photocell or timer controls the on/off cycle. Modern beacons use LED technology for longer life, lower power consumption, and instant‑on capability.

Unlike runway or taxiway fixtures wired into a shared constant-current series circuit, a heliport beacon is a standalone, independently powered unit. It draws directly from the heliport's electrical supply, with a battery or UPS holding it through short outages, and a photocell or timer is the entire control loop — sensing ambient light and switching the beacon on at dusk and off at dawn without input from any wider lighting control system. The rotation itself (or, on LED units, the electronic sequencing that simulates it) is driven by the beacon's own motor or driver circuit, running independently of the colour-flash timing used elsewhere on the airfield. Where a heliport uses paired primary and secondary beacons for line-of-sight redundancy, the two units are not electrically slaved together — each runs its own photocell cycle on its own schedule, and their overlapping coverage comes purely from where they're physically mounted, not from any synchronisation between them. On sites with a remote monitoring system, the beacon reports lamp, rotation, or power status upstream for maintenance visibility, but this is a reporting link only: the beacon keeps cycling on its local photocell logic even if that connection is lost.

The beacon housing is a weatherproof aluminium or cast alloy enclosure, anodised or powder-coated for corrosion resistance, split into an upper optical head and a lower base assembly that carries the drive motor or electronic switching gear. The rotating optical head houses the LED array or halogen/xenon lamp behind coloured (green/yellow/white) glass or dichroic filters, mounted on a precision bearing assembly that allows smooth, low-friction rotation at the required 12-15 RPM; a weatherproof dome or cover, typically borosilicate glass or UV-stabilised polycarbonate, seals the optical chamber to an IP66/IP67 rating while remaining optically clear. The base is bolted to a mast, rooftop plinth, or control tower structure using a flanged mounting ring and stainless-steel fasteners, with the mast itself engineered to hold the beacon at the elevation needed for the required several-nautical-mile visibility. Power and control cabling enters through a sealed gland at the base, feeding the drive motor, lamp circuitry, and photocell or timer controls, with the assembly connected to a UPS or standby generator circuit so the beacon continues operating through mains interruptions.