Accession Number : AD0709191

Title :   A DISCUSSION OF THE USE OF XENON FLASH LAMPS FOR ANTICOLLISION PURPOSES.

Descriptive Note : Final rept. Nov 69-Apr 70,

Corporate Author : AEROSPACE RESEARCH LABS WRIGHT-PATTERSON AFB OH

Personal Author(s) : Land, Peter L.

Report Date : MAY 1970

Pagination or Media Count : 46

Abstract : The report points out a number of advantages which flash lamps have when used for anticollision light systems. A renewal of interest in the use of flash lamps for collision avoidance is noted, and this includes the related problem of avoiding bird strikes. Some of the important factors relevant to the effectiveness of anticollision lights, such as background illumination, intensity distribution and phase relations for a system of flashing lights are discussed. It is noted that the intensity distribution for a rotating beacon has cylindrical geometry, which is a limitation, and that phase relations for rotating or oscillating lamp systems are not and could not be easily maintained constant. It is noted that the advantages which flash lamps have in these respects are not always utilized; for example, at night the intensity distribution for a flash lamp anticollision light system should have the same form as that which applies to navigation lights. It is noted that during turns, the intensity patterns for most focused anticollision light systems are tilted out of the desired plane and it is suggested that for some aircraft it would be practical to sense and compensate for a banked condition. It is noted that flight test results show that flash lamp systems have been rejected mainly because the reflected light which may occur during various conditions caused pilot discomfort and may cause loss of dark adaptation and disorientation. (Author)

Descriptors :   *FLASH LAMPS, *AVIATION SAFETY, XENON, AVIATION ACCIDENTS, BIRDS, VISIBILITY, INTENSITY.

Subject Categories : Military Aircraft Operations
      Air Condition, Heating, Lighting & Ventilating
      Safety Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE