AN ANALYSIS OF RUNWAY VISUAL RANGE.
WEATHER BUREAU ATLANTIC CITY N J TEST AND EVALUATION LAB
Pagination or Media Count:
The results of a controlled observational program were used to validate the credibility of the current runway visual range system, and to provide a basis whereby future visual range systems and lighting methods can be compared. It was found that the current runway visual range system concept is generally credible although certain areas were noted to be considered for modification. Runway visual range for day is conservative in that most static observers could see farther than the current system predicts. The static observers visual range of runway lights by day does not conform to Allards Law when the visual illuminance threshold value is fixed. Night runway visual range, as predicted by the current system, approximates the average visual range of the static observations and generally conforms to Allards Law. The fact was established that runway visual range represents a probability of sighting light targets, and as such should be recognized by the user as not being an exact absolute value. A benchmark system is proposed whereby other visual range systems and lighting techniques can be compared.
- Terminal Flight Facilities
- Human Factors Engineering and Man Machine Systems