Accession Number : AD0668990

Title :   EVALUATION OF SEVERAL MULTI-TRANSMISSOMETER SYSTEMS,

Corporate Author : WEATHER BUREAU ATLANTIC CITY N J TEST AND EVALUATION LAB

Personal Author(s) : Schlatter,Ernest E.

Report Date : DEC 1967

Pagination or Media Count : 111

Abstract : A test program was developed and implemented to evaluate multi-transmissometer systems. These consist primarily of instruments at touchdown, mid-point, and rollout locations at five airfields distributed across the continent in differing climatic regimes. The airfields are located at Atlantic City, N. J., New York City, N. Y., Chicago, Ill., Denver, Colo., and Los Angeles, Calif. The data acquisition technique and program are described. Further data processing is scheduled. Partial analysis of available data indicates that no single transmissometer will always be most representative of lowest visibility conditions at any airport and even with three systems along the runway unreported variations in RVR will still occur. Analysis of 55-, 45-, and 15-second sampling intervals for RVR computation shows little difference between 55- and 45-second sampling. The number and magnitude of differences increase when RVR from a 15-second sampling is compared to RVR from a 55-second sampling especially during rapid changes in transmittance. (Author)

Descriptors :   (*RUNWAYS, *VISIBILITY), (*OPTICAL INSTRUMENTS, *ATMOSPHERES), PERFORMANCE(ENGINEERING), MARKER LIGHTS, METEOROLOGICAL INSTRUMENTS, AIRPORTS, ALL WEATHER AVIATION, NIGHT LANDINGS, LANDING FIELDS, SAMPLING

Subject Categories : Terminal Flight Facilities
      Meteorology

Distribution Statement : APPROVED FOR PUBLIC RELEASE