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Penetration of the alert area will annunciate a GND PROX alert on 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.
DON’T SINK
DON’T SINK
Volume 2 Flight Crew Operating Manual Rev 2A, Apr 11, 2005
Mode 4 . Unsafe Terrain Clearance
Mode 4 provides alerts and warnings for insufficient terrain clearance based on airplane phase of flight and airspeed. 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 . Active when the airplane is in cruise or approach phase of flight and the landing gear is not in the landing position. The alert envelope for Mode 4A begins at 30 feet AGL and extends vertically to an altitude of 500 feet AGL. 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 and will annunciate a GND PROX message and generate a continuous aural “TOO LOW TERRAIN”warning. Penetration of the alert area, below 190 knots, will annunciate a GND PROX alert on the PFD and generate an aural ”TOO LOW GEAR”warning. The aural and visual remain until the airplane exits the envelope.
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual Volume 2
Mode 4 . Unsafe Terrain Clearance (Cont’d)
. Mode 4B . Active when the airplane is in cruise or approach phase of flight and the landing gear is in the landing 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 a GND PROX message 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, will annunciate a GND PROX message on the PFD and generate an aural “TOO LOW FLAP”warning.
NOTE
Flap aural "TOO LOW FLAPS" warning can be silenced by use of the FLAP OVRD switch, located on the pedestal.
Volume 2 Flight Crew Operating Manual Rev 2A, Apr 11, 2005
Mode 4 . Unsafe Terrain Clearance (Cont’d)
. Mode 4C is based on a minimum terrain clearance, or floor, that increases with radio altitude during take-off. Any decrease in altitude below minimum terrain clearance will annunciate a GND PROX message and generate an aural “TOO LOW TERRAIN”warning.
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