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CFO1701002_014
TERRAIN CLOSURE RATE (FEET/MINUTE)

Volume 2 Flight Crew Operating Manual Sep 13/2004 CSP 100-6 REV 1
17-01-18

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.

ALTITUDE LOSE (FEET)

Sep 13/2004 Flight Crew Operating Manual Volume 2 REV 1 CSP 100-6
17-01-19 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 po-sition. 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.
1500
MODE 4A UNSAFE TERRAIN
CLEARANCE
　
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