Date of Award

Fall 12-1998

Document Type

Thesis - Open Access

Degree Name

Master of Aeronautical Science


Aeronautical Science

Committee Chair

John A. Wise

Committee Member

James W. Blanchard

Committee Member

Lance K. Erickson


The purpose of this study was to determine the effectiveness of both a two and four mile range ring versus a single three mile range ring on pilot's perception of future vertical separation as viewed on a cockpit display of traffic information. The subjects consisted of 30 volunteer pilots from Embry-Riddle Aeronautical University and the surrounding Daytona Beach, Florida area.

The simulation of a cockpit display of traffic information was generated using SuperCard® Version 1.6 software and a Macintosh IIx® personal computer. Eighty unique scenarios were monitored by the pilots in which they determined, as early as possible, what the vertical miss distance would be when a single intruder passed the subject's aircraft (ownship). The pilots' perceived vertical miss distance (error) and decision time were compiled for each scenario. The use of multiple range rings required significantly more time for the pilots' to choose a vertical miss distance versus a single range ring. The use of multiple range rings had no significant effect on error versus the single range ring.