TERRAIN CLOSURE RATE WARNING CRITERIA ALTERED (RELAXED) ON AQUISITION OF GLIDE SLOPE GUIDANCE BEAM BY AIRCRAFT GROUND PROXIMITY WARNING SYSTEM

摘要

An aircraft ground proximity warning system having an excessive terrain closure warning mode and a below glide slope warning mode monitors the glide slope signal and modifies the terrain closure warning envelope to accept a lesser terrain clearance when the aircraft is within the glide slope beam.