Interim Runway Visual Range Rvr Automated Surface Observing System Asos Interface Regression Operational Test And Evaluation Ot And E Report

This report details results of a regression test performed on the Interim Runway Visual Range (RVR)/Automated Surface Observing System (ASOS) Interface. Testing was conducted from January 21 through 23, 1997, at Memphis International Airport (MEM). Testing was intended to determine if modifications to the interface corrected problems observed during initial testing October of 1996. Testing also was designed to determine if Interim RVR/ASOS software performance enhancements operated in accordance with user needs and functions. Problems observed during the initial test included the following: (1) ASOS Display Screen Mismatch with RVR product, (2) Interim RVR/ASOS Interface Boot Failure, (3) Interim RVR/ASOS Software Lock-Up, (4) New Generation RVR Output Rate and Interim RVR/ASOS Interface Software synchronization, (5) Phantom RVR products with RVR Configuration Modifications, and (6) False RVR products during RVR Sensor Calibration. Of the problems discovered during initial testing, nine were resolved as a result of modifications to the Interim RVR/ASOS Interface and the ASOS. It was determined that a maintenance procedure could be used to correct the remaining problem. Correction and resolution of the problems identified during initial Operational Test and Evaluation (OT & E) indicate the Interim RVR/ASOS Interface and ASOS RVR functions are suitable for use in the field from an operational perspective. Proper performance demonstrated by the Interim RVR/ASOS Interface self-restart and illegal entry prevention features also indicate the Interim RVR/ASOS Interface can be used with a minimum of maintenance actions by field technicians. These developments suggest the Interim RVR/ASOS Interface is prepared for use at designated Long-Line RVR sites. As a result, ACT-320 recommends deployment of the interface at sites designated by the National Weather Service (NWS) and Federal Aviation Administration (FAA).