Flight Test Evaluation of Slant Visual Range/Approach Light Contact Height (SVR/ALCH) Measurement System
Abstract
The Slant Visual Range/Approach Light Contact Height (SVR/ALCH) System reports the slant visual range that can be seen when the pilot is at 100 feet above ground level and the approach light contact height, which is the altitude at which a pilot will see five light bars, as a landing is conducted under Category II conditions. To provide SVR/ALCH information, the system utilizes a 100-foot tower equipped with forward scatter and luminance meters, an illuminance meter, a touchdown transmissometer, and a minicomputer to process the data. The system was installed at the National Aviation Facilities Experimental Center (NAFEC) and data collected during the period from the fall of 1974 through January 1976. The main objective of this program phase (Phase III) was to evaluate the SVR/ALCH system in terms of accuracy of the SVR and ALCH algorithms compared to what a pilot actually sees during an approach. From the limited data obtained to date, there is evidence that the algorithms predict SVR and ALCH values which agree reasonably well with what the pilot sees.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1976
- Accession Number
- ADA038183
Entities
People
- Carl W. Lohkamp
- Gerald S. Bradley
- Richard W. Williams