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.
CF
O
170100
2_017
100
0
200
300
400
500
600
700
800
900
1000
1100
1200
1300
1400
1500
100
200
300
400
0
MIN TERRAI
N
CLEAR
ANC
E
(
F
EET
)
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
Challenger Global 300 - Navigation
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