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The annunciation envelope consists of two areas: alert and warning.
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Penetration of the alert area will annunciate a GND PROX alert on the PFD and generate 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.
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Penetration of the warning area will annunciate a PULL UP alert on the PFD and generate an aural “PULL UP”warning. The aural warning is annunciated continuously until the condition is rectified.
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual Volume 2
Mode 2 . Excessive Terrain Closure Rate
Mode 2 provides alerts and warnings when the EGPWC detects that the closure rate between the airplane and 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 . Activated when flaps are not in the landing position. Penetration of the alert area will annunciate a GND PROX 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 alert on the PFD and generate an aural “PULL UP”warning. The aural and visual warning are annunciated continuously until the condition is rectified.
Volume 2 Flight Crew Operating Manual Rev 2A, Apr 11, 2005
Mode 2 . Excessive Terrain Closure Rate (Cont’d)
. Mode 2B . Activated when flaps are in the landing configuration, or in the event 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 a GND PROX on 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 PULL UP alert on 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.
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual Volume 2
Mode 3 . Altitude Loss After Take-off
Mode 3 provides warnings when the EGPWC detects that a significant amount of altitude is lost immediately after take-off or during a go-around. Mode 3 uses radio altitude, barometric altitude and altitude rate.
If a descent is initiated following take-off or go-around, the EGPWC 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.
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