Aircraft terrain warning system with configuration modified warning and improved mode switching

摘要

A proximity to terrain warning system for aircraft utilizes a first set of warning criteria to generate a warning in the event of insufficient terrain clearance after take off. A different set of criteria are employed to generate warnings when the aircraft in in a cruise or approach phase of flight or on a tactical mission. Mode switching is provided to select the appropriate criteria and to select an excessive descent after take-off set of warning criteria in addition to the first set of criteria when appropriate.