GPWS - Ground Proximity Warning System je sistem na letalu ali drugemu zrakoplovu, ki pilota obvešča o geografskih ovirah in tako prepreči kontroliran let v teren - (CFIT). Kdaj se uporablja tudi termin TAWS - terrain awareness warning system.
V 1960ih je bilo več nesreč, ko je povsem delujoče letalo zaradi pilotove napake v navigaciji zadelo geografske oviro.Note: Original text copied from U.S. FAA Circular AC23-18 . As a work of the U.S. Government, there is no copyright on the work, and it may be freely copied, and is thus included here. Additional or reduced text and formatting, not included in the original, have been added here for clarity and emphasis.Leta 1974 je ameriška FAA zahtevala uporabo GPWS na vseh turbinskih letalih. ICAO je predlagala uporabpo GPWS leta 1979.Personality Flight Aerospace Industry Awards 1999Marca 2000 je FAA zahtevala uporabo na vseh turbinskih zrakoplovih z 6 ali več sedeži.
GPWS naj bi izumil kanadski inženir C. Donald Bateman
GPWS sistem daje različna opozorila: Prevelika hitrost spuščanja ("SINK RATE" "PULL UP") Približevanje terenu ("TERRAIN" "PULL UP") Izguba višine po vzletu pri veliki moči motorja ("DON'T SINK") Prenizka višina v nepravilni konfiguraciji ("TOO LOW – TERRAIN" "TOO LOW – GEAR" "TOO LOW – FLAPS") Preveč nizka višina pri ILS priletu ("GLIDESLOPE") Prevelik kot nagiba ("BANK ANGLE") Nevarnost strižnega vetra ("WINDSHEAR")
Glej tudi TCAS Kontroliran let v teren Avionika
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Zunanje povezave EGPWS Video Clips —Several professional video clips demonstrating enhanced GPWS. FlitePartners page on EGPWS installations by STC Boeing 727 GPWS explained with clear diagrams Honeywell Aerospace EGPWS Website Cockpit Warning Sounds —planecrashinfo.com C. Donald Bateman at the National Inventors Hall of Fame Garuda Captain ignores EGPWS warnings AeroWorldNet – 1999 EGPWS costs Downward Pressure on the Accident Rate—speech delivered by Nicholas A. Sabanti, FAA Associate Administrator for Aviation Safety Eurofighter Typhoon – BAE SYSTEMS delivers first Eurofighter Typhoon Ground Proximity Warning