Palestine International Airport (Al-Auja)

10 .2.3 Approach Lighting System

• Approach lighting


• Approach lighting systems (ALS) are designed specifically to provide guidance for aircraft
  approaching a particular runway under nighttime or other low-visibility conditions. While
  under nighttime conditions it may be possible to view approach lighting systems from
  several miles away. ALS is a configuration of signal lights starting at the landing threshold
  and extending into the approach area a distance of 2400-3000 feet for precision instrument
  runways.


• In the high-intensity ALSs, the 4m crossbars of five-bulb white light are placed at 30m
  intervals for a distance of 731m from the runway threshold on the extended runway
  centerline.


• The high-intensity ALSs have a long crossbar of green lights at the edge of the runway
  threshold.


• The ALS system, shown in Figure 10- 23 , has two additional crossbars consisting of
  three-bulb white light crossbars which are placed symmetrically about the runway
  centerline at a distance of 150m from the runway threshold.


• Two additional three-bulb red light crossbars are placed symmetrically about the
  extended runway centerline at 30m intervals for the inner 300m to delineate the edges of
  the runway surface.