PAPI, APPROACH, and THRESHOLD LIGHTING

atg airports offer a range of airfield lighting solutions including PAPI lights, approach lighting and threshold lighting, compliant to all the latest standards.  Click on an image below for more information about specific types and models of airfield lighting.

Approach Lighting - Inset and Elevated

Threshold and Runway End Lighting - Inset and Elevated

Papi Systems

PAPI LIGHTS

The L-880 precision approach path indicator, PAPI, system usually consists of four light units located at the side of the runway adjacent to the origin of the glide path. They are equally spaced and a color-coded light output provides a visual indication of an aircraft’s position relative to the designated glide slope for the runway heading. The characteristics of each light unit is identical. Each PAPI light consists of a light source, red filter and lenses. A high-intensity beam is emitted from each unit. The bean shows two distinct colours lower part is red in colour, while the upper part is white. The colour transition boundaries of the four units are fixed at different angles which creates the PAPI guidance beams. The approach position and angle of the aircraft, determines if the light beams will be either red or white to the pilot. If the approaching aircraft is on the correct glide path, the pilot will see two red light indications and two white light indicators. If the aircraft approach angle is too steep, the number of white light beams visible will increase. If the approach angle is low, the pilot will note an increased number of red-light indicators. Following the correct angle of approach, the aircraft will land in the designated part of the runway.

Alternatively, a two light system can be installed, dependant on local requirements, this is a L-881 type PAPI system and is identical to the L-880, except only two light units are used. when the approaching aircraft is on or close to the correct approach path, the unit nearest the runway will be seen as red and the other unit as white.

 

 

AIRPORT APPROACH LIGHTING

Approach lighting forms part of the complete Aviation Ground Lighting pattern. High and/or Low Intensity Approach systems may be provided. The complete Approach Lighting system is made up of several parts, each designed to meet one or more of the above objectives. The extent to which a particular airport is equipped will depend upon its licensing category and the need to continue operations during periods of poor visibility. Variations will be found between approach lighting systems for military airfields and civilian airports (elevated ZA480 and inset ZA480).

Simple airport approach lighting systems consist of a row of luminaires on the extended runway centre line with a crossbar of 10 luminaires recommends that the colour of the lights shall be such that they are distinguishable from other aeronautical ground lights and from any extraneous lighting in the vicinity of the system. Where Low Intensity (LI), simple approach lighting systems are installed, they are required to have luminaires displaying Red light (ZA450).

Supplementary Approach Lighting is only installed for CAT II or CAT III operations and has been previously referred to as SHINGALS (Supplementary High Intensity Narrow Gauge Approach Lighting System). It is the same spacing as used on Touchdown lighting, TDZ, and the aiming point surface markings. The fixtures used for Supplementary Approach applications are the same as those used for the High Intensity Approach System, but Red filters are fitted to luminaires for side row barrettes.

THRESHOLD LIGHTING

Threshold lights indicate the start of the usable part of the runway and dependent on the scale or category of the runway comprise two elements. Firstly a bar of inset lights at the start of the runway, and secondly two wing bars outboard of the runway edge. All threshold lights show green light into the approach. The threshold is normally uni-directional inset luminaires, however where it is co-located with the runway end bar it may consist of bi-directional luminaires showing green into the approach and red to the end of the runway. The wing bar luminaires are uni‑directional elevated or inset luminaires depending on their location.

Runway end lights signify the end of the usable runway. They show red light in the direction of aircraft landing or taking off, and denote the extremity of the usable runway for landing, manoeuvring or take off purposes.

Newsletter Signup!

Newsletter Signup

Please fill in the contact form below to signup to our newsletter.