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• penetration of the alert area will illuminate the GND PROX switch/lights on the
glareshield and generate an aural “SINKRATE SINKRATE”. The aural alert will
be annunciated once, and will be repeated only if condition degrades by more than
20% based on computed time to impact. The visual alert will remain until the
condition is rectified
• penetration of the warning area will illuminate the PULL UP switch/lights on the
glareshield and generate an aural “WHOOP, WHOOP, PULL UP” warning. The
aural warning is annunciated continuously until the condition is rectified
EGPWS Mode 1
Figure 17-19
P604_17_014
2500
2000
1500
1000
500
0
0 2000 4000 6000 8000
"PULL UP"
"SINKRATE”
RADIO ALTITUDE (FEET)
DESCENT RATE (FEET/MINUTE)
“SINKRATE”
“PULL UP”
NAVIGATION SYSTEMS
For Training Purposes Only
May 03
17-31
P I LOT T R A I N I N G GU I D E
Mode 2 - Excessive Terrain Closure Rate
Mode 2 provides alerts and warnings when the EGPWC detects that the closure rate
between the airplane and terrain is excessive. The airplane need not be in descent,
rising terrain may be encountered in level flight, or the terrain may be rising at a rate
greater than the airplane rate of climb. Mode 2 uses radio altitude, vertical speed and
aircraft configuration inputs.
Mode 2 has two submodes: Mode 2A and Mode 2B.
• Mode 2A - Activated when flaps are not in the landing position and the aircraft is
not in the GS beam. Penetration of the alert area will illuminate the GND PROX
switch/lights on the glareshield and generate an aural “TERRAIN, TERRAIN”.
The aural is annunciated once, and the visual alert will remain displayed, until the
condition is rectified. Penetration of the warning area will illuminate the PULL UP
switch/lights on the glareshield and generate an aural “PULL UP” warning. The
aural and visual warnings are annunciated continuously until the condition is
rectified
EGPWS Mode 2A
Figure 17-20
P604_17_015
2500
2000
1500
1000
500
0
0 2000 4000 6000 8000
RADIO ALTITUDE (FEET)
TERRAIN CLOSURE RATE (FEET/MIN)
“TERRAIN
TERRAIN”
“PULL UP”
"PULL UP"
“TERRAIN TERRAIN”
NAVIGATION SYSTEMS
17-32 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
• Mode 2B - Activated when flaps are in the landing configuration, or in the event
the flaps are up and the airplane is on an ILS approach and the glideslope and
localizer deviations are less than ±2 dots and for 60 seconds after takeoff.
Penetration of the alert area will illuminate the GND PROX switch/lights on the
glareshield and enable an aural “TERRAIN, TERRAIN”. The aural and the visual
alerts are annunciated continuously and will remain until the condition is rectified.
Penetration of the warning area will illuminate the PULL UP switch/lights on the
glareshield and generate an aural “PULL UP” warning. The aural and visual
warnings are annunciated continuously until the condition is rectified
EGPWS Mode 2B
Figure 17-21
P604_17_016
2500
2000
1500
1000
500
0
0 2000 4000 6000 8000
RADIO ALTITUDE (FEET)
TERRAIN CLOSURE RATE (FEET/MIN)
“TERRAIN
TERRAIN” “PULL UP”
“PULL UP”
“TERRAIN TERRAIN”
NAVIGATION SYSTEMS
For Training Purposes Only
May 03
17-33
P I LOT T R A I N I N G GU I D E
Mode 3 - Altitude Loss after Takeoff
Mode 3 provides warnings when the EGPWC detects that a significant amount of
altitude is lost immediately after takeoff or during a go-around. Mode 3 uses radio
altitude, barometric altitude and altitude rate.
If a descent is initiated following takeoff or go-around, the EGPWC stores the altitude
value at which the descent began, and compares successive altitude data to the stored
value. Activation of the warning is induced when the minimum terrain clearance, as a
function of altitude lost, is exceeded.
Penetration of the alert area will illuminate the GND PROX switch/lights on the
glareshield and generate an aural “DON’T SINK, DON’T SINK” warning. The aural
warning is annunciated only once, unless the altitude value degrades by more than
20% from the initially stored value, and again at each additional 20% degradation
from the initially stored value. This condition will remain until the airplane regains the
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