Friday, 12 September 2014

Different Forms Of Helipad Lighting

By Jody Leach


Surface level heliports are those for helicopters and are located on the ground. They are characterized by usage of large space. The typical heliport has various helipads. These are the areas that are smooth and flat and are devoted to landing and taking off of helicopters. They are normally located near conventional airports but are in lesser-used areas. Helipad lighting is very important and consists of various forms of lights.

When pilots have difficulties identifying the pilot, beacon lights are used. Beacons are provided in the event that long range visual guidance is deemed necessary. These lights are meant to be located close to the helipad, specifically at elevated locations to ensure pilots are not dazzled at close range. The lights produce equally spaced white flashes. These flashes are normally in the format of letter H of the Morse code.

Beacon lights show at all angles of azimuth, with the intensity being greater than 2500 Cd. The brilliancy control setting should be 3, 10 and 100 percent. Floodlights in helipads are for the illumination of touch down and the area of lift off. These lights are so located as to avoid glare to pilots or the personnel working around the area. The horizontal luminance should be averagely 10 lux. Floodlights also help in illumination of obstacles. Floodlights for obstacles should have a luminance of at least 10cd/m2.

FATO lights are supposed to be placed at the edges of the FATO (final approach and take-off area). The lights should be steady, white, omnidirectional with an intensity of 100 cd and more. The brilliancy control setting ought to be 10, 30 and 100 percent. They normally are placed along the edges of the FATO at uniform spacing.

TLOF lights are placed on the edges of the TLOF (touchdown and lift-off area). They are steady, green, omnidirectional and have intensity of above 30 Cd. They are supposed to be placed along the edges of the TLOF. This is done within a distance of 1.5m from the edge. In the case of surface-level heliports, the lights are supposed to be placed uniformly at intervals not exceeding 5m. Rectangular shaped lights should be at least 12, with the circular shaped ones being 14 in number.

Approaching lights are for the display of preferred direction of approach. They are located in a straight line along the direction that is preferred. They shall be omnidirectional, steady, white or flashing. Flashing lights are useful in the event that identification of the heliport is difficult because of light in the surroundings. In case the approach light system for non-precision FATO is provided, the system is not supposed to be less than 210m.

Aiming point lights are used to approach a specific point prior to proceeding to TLOF. They are supposed to be white, steady, omnidirectional and with intensity more than 100 candelas. Just like the other lighting systems, the brilliancy control setting should be 100, 30 and 10 percent.

Windsock lighting is used to display the windsock and thus direction of wind. A helipad should have at least one indicator of wind direction. Illumination is mandatory for the one used at night.




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