Table of Contents
M
3
ODE
Continued
M
4
ODE
Unsafe
Terrain
Clearance
M
4
ODE
A
060-4241-000 • Rev. D - March 2000
MK V & MK VII EGPWS Pilot Guide
lights and the aural message "DON'T SINK, DON'T SINK". The
aural message is only enunciated twice unless altitude loss
continues. Upon establishing a positive rate of climb, the
EGPWS caution lights extinguish and the aural alert will cease.
If the Aural Declutter feature is disabled, the warning is
enunciated continuously until positive climb is established.
Mode 4 provides alerts for insufficient terrain clearance with
respect to phase of flight, configuration, and speed. Mode 4
exists in three forms, 4A, 4B, and 4C.
• Mode 4A is active during cruise and approach with the gear
and flaps not in the landing configuration.
• Mode 4B is active during cruise and approach with the gear
in the landing configuration and flaps not in the landing
configuration.
• Mode 4C is active during the takeoff phase of flight with
either the gear or flaps not in the landing configuration.
Mode 4 alerts activate the EGPWS caution lights and aural
messages.
To reduce nuisance alerts caused by over-flying another
aircraft, the upper limit of the Mode 4A/B alerting curve can be
reduced (from 1000) to 800 feet. This occurs if the airplane is
above 250 knots with gear and flaps not in landing
configuration and a sudden change in Radio Altitude is
detected. This is intended to eliminate nuisance alerts while
flying a holding pattern and an aircraft over-flight occurs (with
1000 foot separation).
With version -210-210 and later models, Mode 4 airspeed
expansion is disabled (upper limit held at lowest airspeed
limit) when the Terrain Alerting and Display (TAD) function is
enabled and available. This is due to the enhanced alerting
capability provided with TAD, resulting from high integrity GPS
Altitude and Geometric Altitude data. This change to the Mode
4 envelopes reduces the potential for nuisance alerts when the
aircraft is not in the landing configuration.
Mode 4A is active during cruise and approach with gear and
flaps up. This provides alerting during cruise for inadvertent
flight into terrain where terrain is not rising significantly, or the
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