TERRAIN AWARENESS WARNING SYSTEM (TAWS) (Cont)
MODE 3 — Altitude Loss After Takeoff
Mode 3 provides warnings when the TAWS detects that a significant amount of altitude is lost immediately after takeoff or
during go-around. Mode 3 uses radio altitude, barometric altitude and altitude rate.
Mode 3 is enabled after takeoff or go around, when landing gear or flaps are not in landing configuration. Mode 3 stays
enabled until the TAWS detects that the aircraft has gained sufficient altitude that it is no longer in the takeoff phase of
flight.
If a descent is initiated following takeoff or go-around, the TAWS 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 clear-
ance, as a function of altitude lost, is exceeded.
Penetration of the alert area will annunciate a
GND PROX
alert on the attitude display of 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.
CF
O
17010
02_015
2500
2000
1500
1000
500
0
0
200
400
600
"DON'T SINK"
ALTITUDE LOSE (FEET)
RAD
IO AL
TI
TU
DE (F
E
E
T
)
"DON'T SINK"
Challenger Global 300 - Navigation
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