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generated and the EGPWS caution lights illuminate. If the
aircraft continues to penetrate the envelope, the EGPWS
warning lights illuminate and the aural message “PULL UP” is
repeated continuously until the warning envelope is exited. If
the aircraft penetrates the Mode 2B envelope with both gear
and flaps in the landing configuration, the aural “PULL UP”
messages are suppressed and the aural message “TERRAIN”
is repeated until the envelope is exited.
Mode 3 provides alerts for significant altitude loss after takeoff
or low altitude go-around (less than 245 feet AGL or 150 feet,
depending on aircraft type) with gear or flaps not in the landing
configuration. The amount of altitude loss that is permitted
before an alert is given is a function of the height of the aircraft
above the terrain as shown below. This protection is available
until the EGPWS determines that the
aircraft has gained sufficient altitude that it is no longer in the
takeoff phase of flight. Significant altitude loss after takeoff or
during a low altitude go-around activates the EGPWS caution
MODE 2B
Continued
060-4241-000 • Rev. E - December 2003
MK V & MK VII EGPWS Pilot Guide 13
MODE 4
Unsafe
Terrain
Clearance
MODE 4A
lights and the aural message “DON’T SINK, DON’T SINK”.
The aural message is enunciated twice for each 20% degradation
in altitude. 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
MODE 3
Continued
060-4241-000 • Rev. E - December 2003
14 MK V & MK VII EGPWS Pilot Guide
MODE 4A
Continued
MODE 4B
aircraft is not descending excessively. It also provides alerting
for protection against an unintentional gear-up landing.
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
knots.
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
envelope is exited.
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 airspeed, the Mode
4B aural alert is “TOO LOW TERRAIN”. This alert is dependent
　
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