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boundaries of the following alerting envelopes are exceeded:
The enhanced ground proximity warning system (EGPWS) is used to help prevent accidents
caused by unsafe flight maneuvers in proximity of terrain or severe windshear. EGPWS
provides the flight crew with aural alerts, messages and visual annunciations in the event
that the boundaries of the following alerting envelopes are exceeded: <0040>
S Mode 1 Excessive descent rate
S Mode 2 Excessive terrain closure rate
S Mode 3 Altitude loss after take-off
S Mode 4 Unsafe terrain clearance
S Mode 5 Below glideslope alert
S Mode 6 Callouts (descent below minimums, altitude callouts and bank angle alert)
S Mode 7 Windshear detection and alerting
S TAAD Terrain / obstacle awareness alerting and display <0040>
S TCF Terrain clearance floor <0040>
Radar information is displayed on the multifunctional displays by pressing the RDR button
on the display control panel.
Radar or terrain information is displayed on the multifunctional displays by pressing the RDR
/ TERR button on the display control panel. <0040>
A. Mode 1 -- Excessive Descent Rate
Mode 1 alerts are generated when the aircraft has an excessive descent rate close to
the terrain. Mode 1 has two boundaries. Penetration of outer boundary activates the
flashing GPWS lights and generates a SINKRATE, SINKRATE aural alert. Penetrating
the inner boundary activates the flashing GPWS lights and the repeated WHOOP,
WHOOP, PULL UP aural, until the inner warning boundary has been exited.
REV 56, Jan 31/03
Vol. 1 18--80--2
NAVIGATION SYSTEMS
Ground Proximity Warning System
Flight Crew Operating Manual MASTER
CSP A--013
Mode 1 is used for the approach phase of flight and is independent of the aircraft
configuration. Mode 1 alerts are generated when the aircraft has an excessive descent
rate close to the terrain. Mode 1 has two boundaries. Penetration of the outer
boundary activates the flashing GND PROX lights and generates a SINKRATE,
SINKRATE aural alert. Penetrating the inner boundary activates the flashing PULL UP
lights and the repeated WHOOP, WHOOP, PULL UP aural, until the inner warning
boundary has been exited. <0040>
B. Mode 2 -- Excessive Terrain Closure Rate
Mode 2 alerts are generated when the aircraft is closing with terrain at an excessive
rate. Mode 2 has two sub-modes referred to as Mode 2A and Mode 2B. Mode 2A is
active during climbout, cruise, and initial approach (flaps not in landing configuration
and the aircraft is not on glideslope centerline). Penetrating the outer boundary
activates the GPWS lights and generates the TERRAIN, TERRAIN aural. Continued
penetration of the envelope will activate the GPWS lights and generate a repeated
WHOOP, WHOOP PULL UP aural.
Mode 2 alerts are generated when the aircraft is closing with terrain at an excessive
rate. Mode 2 has two sub-modes referred to as Mode 2A and Mode 2B. Mode 2A is
active during climbout, cruise, and initial approach (flaps not in landing configuration
and the aircraft is not on glideslope centerline). Penetrating the outer boundary
activates the GND PROX lights and generates the TERRAIN, TERRAIN aural.
Continued penetration of the envelope will activate the PULL UP lights and generate a
repeated WHOOP, WHOOP PULL UP aural.<0040>
Upon leaving the PULL UP warning area, if terrain clearance continues to decrease, the
TERRAIN aural will be generated until terrain clearance stops decreasing. The GPWS
lights will remain on until 300 feet of barometric altitude has been achieved, or 45
seconds has elapsed, or the GPWS FLAP OVRD has been selected, or the flaps are in
a landing configuration.
Upon leaving the PULL UP warning area, if terrain clearance continues to decrease, the
TERRAIN aural will be generated until terrain clearance stops decreasing. The GND
PROX lights will remain on until 300 feet of barometric altitude has been achieved, or
45 seconds has elapsed, or the GND PROX FLAP OVRD has been selected, or the
flaps are in a landing configuration. <0040>
Mode 2B is activated when flaps are in landing configuration, when making an ILS
approach with glideslope and localizer deviation less than 2 dots, and for the first 60
seconds after take-off. Penetration of the Mode 2B boundary with either gear or flaps
not in a landing configuration, activates the GPWS lights and generates a TERRAIN,
TERRAIN aural. If the aircraft continues to penetrate the boundary the GPWS lights
are activated and a WHOOP, WHOOP PULL UP aural is repeated until the warning
envelope is exited.
Vol. 1 18--80--3
REV 56, Jan 31/03
NAVIGATION SYSTEMS
Ground Proximity Warning System
　
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