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Show Notes
The Ground Proximity Warning System (GPWS) generates aural and visual warnings, when one of the following conditions occurs between radio heights 30 ft and 2 450 ft
Mode 1: Excessive rate of descent
Mode 2: Excessive terrain closure rate
Mode 4: Unsafe terrain clearance when not in landing configuration
Mode 5: Too far below glideslope.
A Terrain Awareness Display (TAD), which predicts the terrain conflict, and displays the terrain on the ND.
A Terrain Clearance Floor (TCF), which improves the low terrain warning during landing.
On newer aircraft the GPWS occurs between radio heights 10 ft and 2 450 ft.
For more info see FCOM DSC-SURV-040