The S4GA LED PAPI Light is a cutting-edge one-projector precision approach path indicator designed specifically for airports seeking a dependable, low-maintenance, and highly visible approach lighting solution. While retaining the familiar maintenance simplicity of traditional halogen PAPIs, S4GA’s LED-based system brings enhanced durability, energy efficiency, and performance reliability. The modular architecture and high-grade LED optics contribute to its extended operational life and resilience in challenging environments, making it a preferred choice for global airfields.
This advanced PAPI solution is compliant with a broad array of international aviation regulations, including ICAO standards, EASA (Europe), FAA (United States), CASA (Australia), AFAC (Mexico), TP312 (Canada), Czech CAA, and NATO STANAG specifications. These certifications affirm its readiness for deployment in civil and military airfields worldwide.
Optically, the S4GA LED PAPI features a multi-lamp, single-projector unit with an optional double-projector configuration. It is Night Vision Goggle (NVG)-compatible and offers vertical angle adjustment up to 10°, along with beam transitions sharper than 3 minutes of arc. The optical system delivers a visibility range exceeding 10 kilometers, with an azimuth coverage of ±8° for ICAO configurations or ±10° for FAA. Each unit draws a maximum of 80 watts and offers five-step adjustable intensity levels. The LED modules, rated for 50,000 hours of use, can be replaced without the need for re-alignment, simplifying maintenance.
From a safety and reliability standpoint, the system incorporates robust fault detection capabilities, including up to 16 types of system diagnostics and four critical fault monitoring features. It is equipped with tilt-fail detection and can be configured with individual Power Control Units (PCUs) per projector, optionally with dual power supplies for redundancy.
The monitoring capabilities include both basic status LED indicators and advanced fault detection via separate communication protocols such as Modbus or radio telemetry. This enables seamless integration into larger airfield control and monitoring networks.
Power flexibility is a key strength of the S4GA LED PAPI. It operates on standard 110–230 VAC but is also available with other configurations including 6.6 Amp airfield series circuits or 24 VDC power sources compatible with solar engines or battery banks. Power control can be configured as a single- or dual-circuit system depending on airfield redundancy requirements.
Manual system control is offered via a board-mounted control box, allowing local or remote mode switching, ON/OFF functionality, and toggling between visible and infrared operation. It also features five programmable intensity levels (1%, 3%, 10%, 30%, 100%), night level presets compliant with FAA (5% and 20%), tilt and lens heater activation, and photoelectric sensor settings for automated adjustment.
Wireless control is enabled through a mesh-type network operating at 868 MHz by default, with options for 2.4 GHz or 915 MHz. This supports an operating range of up to 1.5 kilometers (relay-capable). Control devices include the UR-101 handheld remote, UR-201 monitoring unit, VHF radio trigger, and integration with airfield lighting control and monitoring systems (ALCMS). Additionally, the system can respond to photoelectric input for automated light intensity regulation.
Designed for rugged environments, the system performs reliably in temperatures from -35°C to 55°C, with an optional extended range down to -55°C. With an IP65 ingress protection rating, the lights are resistant to rain, snow buildup, and dust, and feature internal environmental sensors for temperature and humidity.
The construction quality of the S4GA LED PAPI is equally robust. The cabinet and frame are fabricated from corrosion-resistant stainless steel, while breakable couplings are made from aluminum to meet safety regulations. Each unit includes an optional lens heater, a fully integrated power control unit, and adjustable mounting heights between 680 mm and 1000 mm. The entire unit weighs approximately 47 kilograms.
The system complies with a wide array of international and regional standards, including ICAO Annex 14 Volume I (2018), EASA CS ADR-DSN, FAA AC 150/5345-28H, Transport Canada TP312, CASA Part 139, and NATO NVG compatibility standards (Engineering Brief No. 98, 2017). These certifications ensure operational alignment with most global aviation authorities.
Each PAPI or A-PAPI system is delivered with all necessary components for quick installation. An A-PAPI system includes two LED PAPI projectors, two PCUs, a manual control box, signal cable, two mounting frames, six adjustable legs, six frangible connectors, and six mounting bases. The full four-unit PAPI system includes four projectors, four PCUs, a manual control box, three signal cables, four frames, twelve legs, twelve frangible connectors, and twelve mounting bases.
Internally, the system consists of several high-quality components including a top cover, divider structures, metal lens holders, circuit board and cover, LED radiator panels, projector body, control panel, stainless steel mandrel, frangible aluminum legs, and a durable round baseplate—ensuring durability and easy servicing in the field.
The S4GA LED PAPI represents a next-generation, globally compliant solution for airfields seeking performance, longevity, and flexibility in a mission-critical lighting system.
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