Accession Number : AD0664246

Title :   EVALUATION OF ECONOMICAL VISUAL APPROACH INDICATORS.

Descriptive Note : Final rept.,

Corporate Author : NATIONAL AVIATION FACILITIES EXPERIMENTAL CENTER ATLANTIC CITY N J

Personal Author(s) : Brandewie,D. Michael

Report Date : DEC 1967

Pagination or Media Count : 47

Abstract : An evaluation was conducted to determine the feasibility of a variety of 'low-cost' visual approach slope techniques intended to aid pilots in establishing a suitable glide path prior to landing. The techniques included three-color and two-color types. Assessing the suitability of the hardware was not essential to the evaluation. Emphasis was placed on determining photometric characteristics, effects of humidity and temperature upon beam structure, and usefulness as seen in flight. They were compared in flight tests to a two-box 'abbreviated' version of the U. S. Standard twelve-box Visual Approach Slope Indicator (VASI). Except for the two-box VASI, (1) all could produce misleading and possibly hazardous information when condensation or ice formed on the glass face-plates, and (2) none had a useful daytime range. Due to lack of boldness of presentation, all the three-color units were difficult to distinguish from runway edge and obstruction lighting. (Author)

Descriptors :   (*APPROACH LIGHTS, *GLIDE PATH SYSTEMS), DESCENT, LANDING AIDS, APPROACH, COLORS, MODEL TESTS, RUNWAYS, NIGHT LANDINGS, PERFORMANCE(ENGINEERING)

Subject Categories : Terminal Flight Facilities
      Air Navigation and Guidance

Distribution Statement : APPROVED FOR PUBLIC RELEASE