LED Precision Approach Path Indicator

An elevated unidirectional LED unit, grouped left of the runway, marking the glide path by its white-to-red ratio — more white high, more red low. The optics keep the red/white transition band narrow and the boundary straight, so height reads off a line, not a color spread. Elevation, mode and fault codes read through the front glass without opening it, so inspection disturbs neither seal nor aim. The units link by CAN, and the group shuts down on a fault rather than show wrong guidance.

Application/Use

Features

• The main body of the unit is made of corrosion-resistant aluminum alloy with anti-corrosion surface treatment. All fasteners are made of stainless steel, suitable for various harsh environments.
• The frangible aluminum alloy legs are manufactured through precision machining, ensuring stability and reliability.
• Three leg type horizontal support and height adjustment structure, convenient installation and calibration.
• Compact PAPI unit structure with small wind-facing area, and strong wind resistance.
• The excellent optical system design ensures a very narrow red-white beam transition band and a clear straight demarcation line.
• Low energy LED light source, with a comprehensive lifespan of not less than 100,000 hours and light attenuation is less than 30%.
• The integrated surge protection device features high surge withstand capability, compliant with FAA EB67. It has successfully undergone 1.2/50μs - 8/20μs combination wave testing per ANSI/IEEE C62.41, withstanding 10kV peak open-circuit voltage and 5kA peak short-circuit current surges.
• The overall degree of protection is IP66, which could keep interior from dust and water.
• Built-in separate horizontal and vertical spirit levels effectively facilitate quick-installation and structural stability inspection.
• The no-condensation design integrates front glass heating and electronic dryer module to prevent moisture accumulation.
• The elevation angle and level status, operational mode, and fault codes of the PAPI unit can be observed through the front glass without opening the cover.
• The units are interconnected via the CAN protocol, enabling collaborative operation, automatic acquisition and uploading of each unit's operational status to ALCMS.
• Optional communication module, the data of LED PAPI system can be uploaded to ALCMS directly.