Mark V and Mark VII EGPWS Pilot’s Guide
060-4241-000 System Description
Rev H, August 2011 15
Below 1000 feet AGL and above 190 knots airspeed, the
Mode 4A aural alert is “TOO LOW TERRAIN”. This alert
is dependent on aircraft speed such that the alert threshold is
ramped between 500 feet at 190 knots to 1000 feet at 250
Below 500 feet AGL and less than 190 knots airspeed, the
Mode 4A aural alert is “TOO LOW GEAR”.
For either Mode 4A alert, subsequent alert messages occur for
each 20% degradation in altitude. EGPWS caution lights
extinguish and aural messages cease when the Mode 4A alert
envelope is exited.
If the Aural Declutter feature is disabled, mode 4A alert
messages are repeated continuously until the Mode 4A
Mode 4B is active during cruise and approach, with gear
down and flaps not in the landing configuration.
Below 1000 feet AGL and above 159 knots (185 knots for
Boeing 747-8) airspeed, the Mode 4B aural alert is “TOO
LOW TERRAIN”. This alert is dependent on aircraft speed
such that the alert threshold is ramped between 245 feet at 159
knots (185 knots for Boeing 747-8) to 1000 feet at 250 knots.
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