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AGL. Mode 1 requires radio altitude and rate-of-descent data.
The annunciation envelope consists of two areas, alert and warning.
- Penetration of the alert area annunciates a GND PROX amber CAS alert on the PFD and generates an aural
“SINKRATE, SINKRATE”. The aural alert will be annunciated once and will be repeated only if condition
degrades by more than 20% based on computed time to impact. The visual alert will remain until the condition is
rectified.
- Penetration of the warning area will annunciate a PULL UP red CAS alert on the PFD and generate an aural
“PULL UP” warning. The aural warning is annunciated continuously until the condition is rectified.
CFO1701002_012
2500
2000
1500
1000
500
0
0 2000 4000 6000 8000
RADIO ALTITUDE (FEET)
DESCENT RATE (FEET/MINUTE)
"SINKRATE"
"PULL UP!"
"PULL UP!"
"SINKRATE"
NAVIGATION
Sep 13/2004 Flight Crew Operating Manual Volume 2
REV 1 CSP 100-6 17-01-17
TERRAIN AWARENESS WARNING SYSTEM (TAWS) (Cont)
MODE 2 — Excessive Terrain Closure Rate
Mode 2 provides alerts and warnings when the TAWS detects that the closure rate between the airplane and the terrain is
excessive. The airplane need not be in descent; rising terrain may be encountered in level flight or the terrain may be rising
at a rate greater than the airplane rate of climb. Mode 2 uses radio altitude and vertical speed inputs.
Mode 2 has two sub-modes, Mode 2A and Mode 2B.
MODE 2A
Mode 2A is activated when flaps are not in the landing position. Penetration of the alert area will annunciate a GND PROX
amber CAS on the PFD and generate an aural “TERRAIN, TERRAIN.” The aural is annunciated once and the visual alert
will remain until the condition is rectified. Penetration of the warning area will annunciate a PULL UP warning CAS alert
on the PFD and generate an aural “PULL UP” warning. The aural and visual warning are annunciated continuously until
the condition is rectified. CFO1701002_013
2500
2000
1500
1000
500
0
RADIO ALTITUDE (FEET)
0 2000 4000 6000 8000
TERRAIN CLOSURE RATE (FEET/MINUTE)
10000
"TERRAIN "PULL UP!"
TERRAIN"
"PULL UP!"
SPEED
EXPANSION
"TERRAIN, TERRAIN"
NAVIGATION
Volume 2 Flight Crew Operating Manual Sep 13/2004
17-01-18 CSP 100-6 REV 1
TERRAIN AWARENESS WARNING SYSTEM (TAWS) (Cont)
MODE 2 — Excessive Terrain Closure Rate (Cont)
MODE 2B
Mode 2B is activated when flaps are in the landing configuration, or if the flaps are up and the airplane is on an ILS approach
and the glideslope and localizer deviations are less than ± 2 dots and for 60 seconds after take-off. Penetration of
the alert area will annunciate an amber GND PROX on the attitude display of the PFD and enable an aural “TERRAIN,
TERRAIN”. The aural and the visual alerts are annunciated continuously and will remain until the condition is rectified.
Penetration of the warning area will annunciate a red PULL UP on the attitude display of the PFD and generate an aural
“PULL UP” warning. The aural and visual warning are annunciated continuously until the condition is rectified. The Mode
2B warning envelope is inhibited at an altitude below 30 feet AGL.
CFO1701002_014
2500
2000
1500
1000
500
0
RADIO ALTITUDE (FEET)
0 2000 4000 6000 8000
TERRAIN CLOSURE RATE (FEET/MINUTE)
10000
"TERRAIN "PULL UP!"
TERRAIN"
"PULL UP!"
"TERRAIN TERRAIN"
NAVIGATION
Sep 13/2004 Flight Crew Operating Manual Volume 2
REV 1 CSP 100-6 17-01-19
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 clearance,
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
　
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