PowerPoint Presentation

[Audio] Mode 4 provides minimum terrain clearance protentional in all phases of flight. There are three types of Mode 4 alerts, Mode 4A and Mode 4B (both active during cruise and approach), and Mode 4C active during takeoff. Mode 4A and Mode 4B trigger aural and visual alerts when terrain clearance is not sufficient based on the phase of flight, the configuration of the landing gear and the flaps, and the speed. Mode 4C triggers aural and visual alerts based on the minimum terrain clearance and the radio height of the aircraft. Mode 5 provides protection for inadvertent decent a glide slopes while on an ILS approach. GPWS monitors the flight path in relative to the glideslope centerline while on the ILS final approach course..