Test of Glide Slope Guidance with and without Simplified Abbreviated Visual Approach Slope Indicator.
Interim rept. Jul-Dec 73,
NATIONAL AVIATION FACILITIES EXPERIMENTAL CENTER ATLANTIC CITY N J
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In a flight test at a small airport, rectangular aiming-point markings with and without the additional use of a low-cost version of the redwhite simplified abbreviated visual approach slope indicator SAVASI served as daytime approach guidance aids. Results showed that approaches made with the SAVASI were less variable in measured approach slope, and approaches made in the last half-mile before landing were near the 4 degrees SAVASI glidepath angle. On average, approaches made either with or without the SAVASI were steeper than 4 degrees, and tracking of itinerant aircraft not informed of the testing confirmed that the usual approach for small aircraft at this runway was in the 5 degrees to 6 degrees range. This indicates that future installations of SAVASI or related guidance aids should be made after measuring the normal practice at a given airport. Test pilot opinion was that the SAVASI was easy to use and provided good guidance in the vertical plane and that the rectangular aiming-point markings were beneficial. Author
- Air Navigation and Guidance