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initial altitude value. Mode 3 is inhibited for radio altitude in excess of 1500 feet.
EGPWS Mode 3
P604_17_017
2500
2000
1500
1000
500
0
0 150 300
RADIO ALTITUDE (FEET)
ALTITUDE LOSS (FEET)
“DON'T SINK”
“DON'T SINK”
50 100 200 250
NAVIGATION SYSTEMS
17-34 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Mode 4 - Unsafe Terrain Clearance
Mode 4 provides alerts and warnings for insufficient terrain clearance based on
airplane phase of flight and airspeed. Mode 4 requires radio altitude, computed
airspeed, gear position and flap position inputs. The alert and warning envelopes are
based on minimum allowable terrain clearance as a function of computed airspeed.
Mode 4 is divided into 3 submodes: Mode 4A, Mode 4B and Mode 4C.
• Mode 4A - Active when the airplane is in cruise or approach phase of flight, and
the landing gear is not in the landing position. The alert envelope for Mode 4A
begins at 30 feet AGL and extends vertically to an altitude of 500 feet AGL.
Penetration of the alert area, above 190 knots (the upper boundary increases with
airspeed to a maximum of 1000 feet radio altitude at 250 knots or more) will
illuminate the GND PROX switch/lights on the glareshield and generate an aural
“TOO LOW TERRAIN” warning. Penetration of the alert area, below 190 knots,
will illuminate the GND PROX switch/lights on the glareshield and generate an
aural “TOO LOW GEAR” warning. The aural and visual remain until the airplane
exits the envelope
EGPWS Mode 4A
Figure 17-22
P604_17_018
1500
1000
500
0
0 100 200 300 400
“TOO LOW
TERRAIN”
“TOO LOW TERRAIN”
“TOO LOW GEAR”
Aircraft Slowed to
Less than 190 Knots
MIN TERRAIN CLEARANCE (FEET)
COMPUTED AIRSPEED (KNOTS)
RUNWAY
UNSAFE TERRAIN CLEARANCE
GEAR UP, FLAPS UP
“TOO LOW GEAR”
Warning Area
“TOO LOW TERRAIN”
Warning Area
NAVIGATION SYSTEMS
For Training Purposes Only
May 03
17-35
P I LOT T R A I N I N G GU I D E
• Mode 4B - Active when the airplane is in cruise or approach phase of flight, and
the landing gear is in the landing position and flaps are not in the landing
configuration. The alert envelope for Mode 4B extends vertically to an altitude of
245 feet AGL. Penetration of the alert area, above 159 knots, will illuminate the
GND PROX switch/lights on the glareshield and generate a continuous aural
“TOO LOW TERRAIN” warning. The aural and visual warning remains until the
airplane exits the envelope. Penetration of the alert area, below 159 knots, will
illuminate the GND PROX switch/lights on the glareshield and generate an aural
“TOO LOW FLAP” warning. These alerts can be deactivated by selecting the
GPWS FLAP OVRD switch to override
EGPWS Mode 4B
Figure 17-23
P604_17_019
1500
1000
500
0
0 100 200 300 400
“TOO LOW
TERRAIN”
“TOO LOW TERRAIN”
“TOO LOW FLAPS”
Aircraft Slowed to
Less than 159 Knots
Gear Down
MIN TERRAIN CLEARANCE (FEET)
COMPUTED AIRSPEED (KNOTS)
RUNWAY
Unsafe terrain clearance
gear down, flaps <30
“TOO LOW TERRAIN”
Warning Area
“TOO LOW FLAPS”
Warning Area
NAVIGATION SYSTEMS
17-36 For Training Purposes Only
Sept 04
P I LOT T R A I N I N G GU I D E
• Mode 4C is based on a minimum terrain clearance, or floor, that increases with
radio altitude during takeoff. At takeoff the Minimum Terrain Clearance (MTC) is
at zero feet. As the aircraft ascends, the MTC is increased to 75% of the aircraft’s
current (average of the previous 15 seconds) radio altitude. This value is limited to
500 feet AGL for airspeed less than or equal to 190 knots. If the airspeed is greater
than 190 knots, the MTC increases linearly with increasing airspeed up to 250
knots. Beyond 250 knots, the MTC is limited to 1000 feet AGL. Any decrease in
altitude below minimum terrain clearance will illuminate the GND PROX switch/
lights on the glareshield and generate an aural “TOO LOW TERRAIN” warning
• it is activate after takeoff when the gear or flaps are not in the landing
configuration. It is also active during a low altitude go-around if the aircraft has
descended below 245 feet AGL
EGPWS Mode 4C
Figure 17-24
P604_17_020
3000
2000
1000
0
0 400 800 1200 1600 2000 2400
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