AN ANALYSIS OF REQUIREMENTS FOR DISPLACED THRESH OLD RUNWAY LIGHTING.

Human factors aspects of the problem of lighting a runway threshold that has been displaced from the end of the pavement to insure approach clear ance of obstacles are summarized. The relation between the runway dimensions and the approach lighting system, particularly concerning potential dangers of causing low approaches, are also con sidered. If colored edge lights are used in the runway extension that comes before the displaced threshold on the landing path, there is a possi bility that an approach guidance conflict will arise. Rather than such color coding of the ex tension, it is recommended that shielded edge light fixtures be employed. A simulation program is recommended 1 to determine the probability of occurrence and the magnitude of any adverse effect of the guidance conflict 2 to establish the acceptable tolerance in spacing between a run way threshold and the approach lighting system and 3 to verify the requirement for the red terminating bar in the approach light system. Author