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“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.
CFO1701002_015
2500
2000
1500
1000
500
0
0 200 400 600
"DON'T SINK"
ALTITUDE LOSE (FEET)
RADIO ALTITUDE (FEET)
"DON'T SINK"
NAVIGATION
Volume 2 Flight Crew Operating Manual Sep 13/2004
17-01-20 CSP 100-6 REV 1
TERRAIN AWARENESS WARNING SYSTEM (TAWS) (Cont)
MODE 4 — Unsafe Terrain Clearance
Mode 4 provides alerts and warnings for sufficient terrain clearance based on the airplanes phase of flight and speed. 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 sub-modes: Mode 4A, Mode 4B, and Mode 4C.
MODE 4A
Mode 4A is 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. During
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. This annunciates an amber GND PROX display and generates a continuous aural “TOO
LOW TERRAIN” warning. Penetration of the alert area 190 kt, annunciates an amber GND PROX alert on the PFD and
generates an aural “TOO LOW GEAR” warning. The aural and visual remains until the airplane exits the envelope.
CFO1701002_016
MODE 4A UNSAFE TERRAIN
CLEARANCE
RUNWAY
"TOO LOW
TERRAIN"
AIRCRAFT SLOWED TO
LESS THAN 190 KTS
"TOO LOW TERRAIN" "TOO LOW GEAR"
100
0
200
300
400
500
600
700
800
900
1000
1100
1200
1300
1400
1500
0 100 200 300 400
MIN TERRAIN CLEARANCE (FEET)
COMPUTED AIRSPEED (KTS)
UNSAFE TERRAIN CLEARANCE
GEAR UP, FLAPS UP
TOO LOW GEAR
WARNING AREA
TOO LOW TERRAIN
WARNING AREA
NAVIGATION
Sep 13/2004 Flight Crew Operating Manual Volume 2
REV 1 CSP 100-6 17-01-21
TERRAIN AWARENESS WARNING SYSTEM (TAWS) (Cont)
MODE 4 — Unsafe Terrain Clearance (Cont)
MODE 4B
Mode 4B is active when the airplane is in cruise or approach phase of flight and the landing gear is in the DN 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 an amber GND PROX display on the PFD 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, annunciates an amber GND PROX display on the PFD and generates an aural “TOO LOW FLAPS”
warning.
NOTE: Aural “TOO LOW FLAPS” warning can be silenced by selecting OFF on the FLAPS switch, which is located
on the TAWS WARN panel.
CFO1701002_017
100
0
200
300
400
500
600
700
800
900
1000
1100
1200
1300
1400
1500
0 100 200 300 400
MIN TERRAIN CLEARANCE (FEET)
COMPUTED AIRSPEED (KTS)
UNSAFE TERRAIN CLEARANCE
GEAR DN, FLAPS UP
TOO LOW FLAPS
WARNING AREA
RUNWAY
"TOO LOW
TERRAIN"
MODE 4B UNSAFE TERRAIN
CLEARANCE
AIRCRAFT SLOWED TO
LESS THAN 159 KTS
GEAR DOWN
"TOO LOW TERRAIN" "TOO LOW FLAPS"
TOO LOW TERRAIN
WARNING AREA
NAVIGATION
Volume 2 Flight Crew Operating Manual Sep 13/2004
17-01-22 CSP 100-6 REV 1
TERRAIN AWARENESS WARNING SYSTEM (TAWS) (Cont)
MODE 4 — Unsafe Terrain Clearance (Cont)
MODE 4C
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 an amber GND PROX display on the PFD and generate an
aural “TOO LOW TERRAIN” warning.
CFO1701002_018
200
0
400
600
800
1000
1200
1400
1600
1800
2000
2200
　
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