Precision Approach Path Indicator (PAPI)

An elevated unidirectional halogen unit, left of the runway, showing an aircraft on final whether it is high or low on the glide path by its white-to-red ratio — more white when high, more red when low. The optics keep the red/white transition line straight, so the crew reads a clean boundary; coated filters hold a firm, heat-stable coating that does not fade under halogen heat. A four-digit display reads elevation; operation and calibration-flight modes mean aiming and flight checks need no external instrument.

Application/Use

Features

• Light distribution and color of the lighting fixtures meet the requirements of Annex 14 of ICAO
• Special optical system design makes excellent red and white transition of PAPI and straight transition line
• Optical parts have self-positioning design and recalibration is unnecessary for replacing the optical components and lamp
• The filter employs advanced coating technology, with high light transmittance, firm coating and good thermostability
• A heater strip built in the front windshield may remove the condensation, which does not impact the luminous effect of the lighting fixtures
• Intelligent electric control system may make PAPI automatically turn off the light in case of abnormal cases
• Each lighting fixture has a 4-digit LED Nixie tube to timely display the elevation of the lighting fixture with high precision
• The unit controller may be operated through one key, which is easily operated and conveniently mastered
• “Operation” and “Calibrate Flight” are set for the control panel for easier use
• The open-circuit monitoring function makes the system more reliable and safer
• The optional communication module may make the data of the PAPI system to be directly uploaded to the monitoring system
• The lighting fixtures have a compact structure, attractive appearance, small face area and high wind loading rating
• Main body of the lighting fixtures is made of aluminum alloy material with special anodizing surface treatment, and all fasteners are made of stainless steel, thus being applicable to all kinds of harsh environment
• The landing leg made of the aluminum alloy has the frangible function. After precision mechanical processing, it complies with the requirements of FAA, with stable and reliable performance
• The energy consumption of 3 105W reflector lamps is only half that of the traditional PAPI
• Sealing design of the lighting fixtures makes water and dust entry impossible
• Three landing leg type horizontal support and height adjusting mechanism make on-site PAPI installation and calibration convenient and accurate
• Independent level gauges are set horizontally and vertically for the lighting fixtures for easy installation and maintenance