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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 and will annunciate a GND PROX message and generate a
continuous aural “TOO LOW TERRAIN” warning. Penetration of the alert area, below 190
knots, will annunciate a GND PROX alert on the PFD and generate an aural ”TOO LOW
GEAR” warning. The aural and visual remain until the airplane exits the envelope.
TOO LOW
GEAR
TOO LOW
TERRAIN
20
10
20
10
GF1710_068
GND
PROX
GND
PROX
20
10
20
10
GF1710_069
"TOO LOW TERRAIN"
AIRCRAFT SLOWED TO
LESS THAN 190 KNOTS
UNSAFE TERRAIN CLEARANCE
GEAR UP, FLAPS UP
MIN TERRAIN CLEARANCE (FEET)
1500
1400
1300
1200
1100
1000
900
800
700
600
500
400
300
200
100
400
COMPUTED AIRSPEED (KNOTS)
RUNWAY
TOO LOW TERRAIN
WARNING AREA
TOO LOW GEAR
WARNING AREA
0
0 100 200 300
" TOO LOW TERRAIN " " TOO LOW GEAR "
NAVIGATION
REV 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
Volume 2
17−10−37
EGPWS MODES (CONT'D)
Mode 4 − Unsafe Terrain Clearance (Cont’d)
· Mode 4B − Active when the airplane is in cruise or approach phase of flight and the landing
gear is in the landing position. The alert envelope for Mode 4B begins at 30 feet AGL and
extends vertically to an altitude of 245 feet AGL. Penetration of the alert area, above 159
knots, will annunciate a GND PROX message and generate a continuous aural “TOO LOW
TERRAIN” warning. The aural and visual remain until the airplane exits the envelope.
Penetration of the alert area, below 159 knots, will annunciate a GND PROX message on
the PFD and generate an aural “TOO LOW FLAP” warning.
NOTE
Flap aural "TOO LOW FLAPS" warning can be silenced by use of the
FLAP OVRD switch, located on the pedestal.
GF1710_070
TOO LOW
TERRAIN
TOO LOW
FLAPS
20
10
20
10 GND
PROX
GND
PROX
20
10
20
10
OVRD
GF1710_071
"TOO LOW TERRAIN"
AIRCRAFT SLOWED TO
LESS THAN 159 KNOTS
UNSAFE TERRAIN CLEARANCE
GEAR DOWN, FLAPS UP
TOO LOW TERRAIN
TOO LOW FLAPS
WARNING AREA
MIN TERRAIN CLEARANCE (FEET)
1500
1400
1300
1200
1100
1000
900
800
700
600
500
400
300
200
100
0
0 100 200 300 400
COMPUTED AIRSPEED (KNOTS)
RUNWAY
GEAR DOWN
" TOO LOW TERRAIN " " TOO LOW FLAPS "
WARNING AREA
NAVIGATION
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
17−10−38
EGPWS MODES (CONT'D)
Mode 4 − Unsafe Terrain Clearance (Cont’d)
· Mode 4C is based on a minimum terrain clearance, or floor, that increases with radio altitude
during takeoff.
Any decrease in altitude below minimum terrain clearance will annunciate a
GND PROX message and generate an aural “TOO LOW TERRAIN” warning.
TOO LOW
TERRAIN
20
10
GF1710_072
GND
PROX
20
10
GF1710_073
0 400 800 1200 1600 2000 2400 2800
UNSAFE TERRAIN CLEARANCE
GEAR DOWN, FLAPS UP
1500 FPM CLIMB RATE
TAKEOFF
OVER FLAT TERRAIN
OR WATER
WARNING AREA (>250 KNOTS)
WARNING AREA
(<190 KNOTS)
RADIO ALTITUDE (FEET)
"TOO LOW TERRAIN"
"TOO LOW TERRAIN"
2800
2600
2400
2200
2000
1800
1600
1400
1200
1000
800
600
400
200
0
3000
MIN TERRAIN CLEARANCE (FEET)
NAVIGATION
REV 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
Volume 2
17−10−39
EGPWS MODES (CONT'D)
Mode 5 − Descent Below Glideslope
Mode 5 provides alerts and warnings when the airplane descends below the glideslope on an ILS
approach. The alerts and warnings are annunciated in two distinct tones, depending on the
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