Boeing EGPWS (Enhanced Ground Proximity Warning System) GPWS (Ground Proximity Warning System) callout are audio warnings that alert pilots to potential hazards in the aircraft's flight path. The callout are designed to be clear and concise, so that pilots can take immediate action to avoid a collision. See also: Terrain Awareness Warning System (TAWS), Enhanced Ground Proximity Warning System (EGPWS), Controlled flight into terrain (CFIT), Windshear.
Pilot error.