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and altitude rate.
If a descent is initiated following takeoff
or goaround,
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 annunciate a GND PROX alert on the PFD and generate an aural
“DONT SINK, DONT 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 initial altitude value. Mode 3 is inhibited for radio altitude values in excess of
1500 feet.
DON’T SINK
DON’T SINK
20
10
GF1710_066
GND
PROX
20
10
500
1000
1500
2000
2500
RADIO ALTITUDE (FEET)
ALTITUDE LOSS (FEET)
0 200 400 800
0
"DON’T SINK"
GF1710_067
" DON’T SINK "
NAVIGATION
Flight Crew Operating Manual Rev 2A, Apr 11, 2005
CSP 700−5000−6
Volume 2
17−10−40
EGPWS MODES (CONT'D)
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 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 2A, Apr 11, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
17−10−41
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
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