proximity warning indicator
Also found in: Acronyms.
proximity warning indicator
[präk′sim·əd·ē ¦wȯrn·iŋ ′in·də‚kād·ər] (navigation)
An airborne instrument which produces a warning signal indicating the approach of an aircraft on a possible collision course. Abbreviated PWI.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.