Accession Number : ADA258844


Title :   1991 LLWAS Anemometer Test Program.


Descriptive Note : Final rept. Nov 90-Sep 91


Corporate Author : JOHN A VOLPE NATIONAL TRANSPORTATION SYSTEMS CENTER CAMBRIDGE MA


Personal Author(s) : Phillips, Charles O ; Burnham, David ; Jacobs, Leo ; Hazen, David


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a258844.pdf


Report Date : Sep 1992


Pagination or Media Count : 99


Abstract : Performance tests of anemometers under icing and snow conditions were conducted during 1990-1991 on the test field at Rochester, MN and in icing chambers and wind tunnels at Sterling, VA. These tests were done for the FAA LLWAS program to test sensors for the next phase of LLWAS. Sensors from ten manufacturers were accepted into the test program from the respondents to the Commerce Business Daily. These sensors were required first to pass an icing chamber test in order to be field tested. The field tests lasted from November 1990 to July 1991. Afterwards, all sensors were sent to Sterling, VA for wind tunnel tests in September 1991. All units from the eight manufacturers that passed the icing chamber test were in the field test. A propeller/vane sensor that failed the icing chamber test was put in the field as a reference. All the units that passed were not affected by icing during the field test although a mechanical unit was affected by snow during one event. The propeller/vane was affected by icing during one event. Wind tunnel tests were done to check starting thresholds and calibration anomalies found in the field. It was concluded that there is no one winning technology that could be found from the tests.... Low level Windshear alert system, Windshear, Microbursts, Anemometer, Thunderstorms.


Descriptors :   *DETECTORS , *PERFORMANCE TESTS , *FIELD TESTS , *ICE FORMATION , *WIND TUNNEL TESTS , *CALIBRATION , *WIND SHEAR , *ANEMOMETERS , *SNOW , TEST AND EVALUATION , WIND TUNNELS , THUNDERSTORMS , PROPELLERS , STARTING , ANOMALIES


Subject Categories : Flight Control and Instrumentation
      Electrical and Electronic Equipment


Distribution Statement : APPROVED FOR PUBLIC RELEASE