一： Airport Lighting System
Airport lights, like the airport ground signs, belong to the visual navigation aids of the airport.
Their purpose is to better guide the aircraft to approach and land safely, especially in the flight at night and under the conditions of low cloud and low visibility.
The airport lighting system plays an irreplaceable role. At present, the airport lighting system is generally divided into three categories: approach, landing and taxiing.
It's these easily recognizable and orderly lights that help the plane land safely on the ground and send you to your destination safely?
二： Approach Lighting System
Approach lighting system (ALS) is a kind of auxiliary navigation light. It provides an eye-catching visual reference for the location and direction of the runway entrance when the aircraft lands at night or in low visibility.
The approach lighting system is installed at the approach end of the runway and is a series of horizontal lights, flashing lights (or a combination of both) extending outward from the runway.
The approach light is usually used on the runway with instrument approach procedure, which enables the pilot to visually distinguish the runway environment and help the pilot align the runway when the aircraft approaches and reaches the predetermined point.
The above figure shows the group lights of the approach lighting system.
The first is the approach centerline light. Outside the runway, five rows of variable white glare lamps shall be set at 900m from the extension line of the center line, and a row shall be set every 30m until the runway entrance.
In the case of a simple runway, the longitudinal spacing of lamps shall be 60 meters, and shall extend to at least 420 meters of the extension line of the runway centerline.
One light in the center of the five lights of the approach center line is just located on the extension line of the center line. From 900m to 300m of the extension line of the center line, they form a row of sequential flashing light lines, flashing twice per second.
Looking down from the plane, this group of lights flashed from a distance and pointed directly at the end of the runway. It is nicknamed "rabbit" because it looks like a ball of white fur running quickly towards the runway entrance.
At the integral multiple distance of 150m from the runway entrance, the variable white horizontal light is called approach horizontal light.
The approach crossbar light is perpendicular to the runway centerline, and the inner side of each side is 4.5m away from the extension line of the runway centerline.
The two rows of white lights on the drawing that are horizontal with the approach center line light and longer than the approach center line light (if you have to think it is orange, I can't help it) are two groups of approach horizontal lights. One is to prompt the distance of the runway, and the other is to allow the pilot to correct whether the two wings of the aircraft are horizontal.
The two rows of red lights on both sides of the approach center line lights on the drawing are called approach side line lights. These two rows of lights extend from the runway entrance to 270 meters, and the spacing of each row of lights is 30 meters. Generally, such lights are only installed on the precision approach runway.
It reminds the pilot that this is not a runway and cannot land here.
In addition, there is a light group called "visual approach slope indicator" (Vasi). The indicator light is composed of multiple pairs of light groups, which are generally divided into barrel type, three row type or T type.
With different types, the number of lamp groups is also different, and the installation position is also different.
Some are arranged symmetrically on both sides of the runway, while most are arranged on the left side of the runway.
This is a row of bright lights shining forward. A filter glass is placed in front of each lamp, which is red at the top and white at the bottom. There is a baffle not far in front of the lamp, and there is an adjustable narrow gap on the baffle.
When the light passes through the slit, it shines along the descent slope of the aircraft.
Looking at this group of lights from the plane, if the pilot sees all white light, it indicates that the plane is flying too high;
If the pilot sees all the red light, the plane is flying too low.
Only when the pilot sees the red light above and white light below, the descent slope of the aircraft is correct and can land safely.
For "Landing Lighting System", please refer to the second article !
E-mail: salesw@hangroup.cn (Jane Zhai)
XIAN GREEN TECH CO.,LTD.
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