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MIN TERRAIN CLEARANCE (FEET)
1400
1300 1200
1100 1000 900 800 700 600 500 400 300 200 100
0
Volume 2 Flight Crew Operating Manual Sep 13/2004 CSP 100-6 REV 1
17-01-20
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.
MODE 4B UNSAFE TERRAIN
CLEARANCE
MIN TERRAIN CLEARANCE (FEET)
1500 1400 1300
1200
1100 1000 900 800 700 600 500 400 300 200
100 0
0 100 200 300
NOTE: Aural “TOO LOW FLAPS” warning can be silenced by selecting OFF on the FLAPS switch, which is located on the TAWS WARN panel.
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 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.
Volume 2 Flight Crew Operating Manual Sep 13/2004 CSP 100-6 REV 1
17-01-22
MODE 5 — Descent Below Glideslope
Mode 5 provides alerts and warnings when the airplane descends below the glideslope on an ILS approach. The alerts and warnings are annunciated in two distinct tones, depending on the position of the airplane on the glideslope.
When the airplane descends more than 1.3 dots (but no more than 2 dots) below the glideslope, a quiet (6 dB) aural “GLIDESLOPE” is generated. If the airplane continues to descend and deviates more than 2 dots below the glideslope, an aural “GLIDESLOPE” warning is generated at the same volume level as all other warnings. An amber GND PROX is dis-played on the PFD. The aural and visual alerts and warnings are continuously annunciated until the airplane exits the alert envelope.
NOTE: The “GLIDESLOPE” aural warning can be muted by selecting the GS switch OFF, which is located on the TAWS WARN panel.
Sep 13/2004 Flight Crew Operating Manual Volume 2 REV 1 CSP 100-6
17-01-23 TERRAIN AWARENESS WARNING SYSTEM (TAWS) (Cont)
MODE 6 — Altitude Callouts
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