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Ground Proximity Warning System <2040>
Figure 18---80---2
Display Control Panel
Pilot’s and Copilot’s Side Panels
BRG FORMAT RANGE
RDR/TERR TFC
SOURCE
NAV
Ground Proximity Warning Panel
Centre Pedestal
GRND PROX TERRAIN (Guarded)
Used to inhibit the terrain map display
(terrain clearance floor and terrain /
obstacle awareness alerting and display
functions). Basic GPWS modes (1--6)
and windshear mode (7) remain active.
OFF light indicates inhibit is selected.
Left and Right Glareshield
PULL UP / GND PROX
PULL UP -- Flashes (red) during ground proximity
warnings. Will stop flashing when airplane has
recovered from warning envelope.
GND PROX -- Flashes (amber) during ground
proximity cautionary alerts. Will stop flashing when
airplane has recovered from the caution envelope.
Switch is also used to initiate GPWS system test
(on ground), or to provide the glideslope cancel
function (when airborne).
NOTE
The GRND PROX TERRAIN
switch should be selected OFF
when within 15nm of an airport
that has no approved instrument
approach procedures or an airport
that is not in the GPWS database.
RDR / TERR
Used toalternately
select or deselect
a radar or terrain
on the MFD display.
Vol. 1 18--80--4
NAVIGATION SYSTEMS
Ground Proximity Warning System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
A. Mode 1 -- Excessive Descent Rate
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 outer boundary
activates the GND PROX lights and generates a SINKRATE, SINKRATE aural alert.
Penetrating the inner boundary activates the PULL UP lights and the repeated
(WHOOP, WHOOP) PULL UP aural, until the inner warning boundary has been exited.
<2040>
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 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. <2040>
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. <2040>
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 GND PROX lights and generates a
TERRAIN, TERRAIN aural. If the aircraft continues to penetrate the boundary the
PULL UP lights are activated and a (WHOOP, WHOOP) PULL UP aural is repeated
until the warning envelope is exited. <2040>
If the aircraft penetrates the Mode 2B boundary with both gear and flaps in a landing
configuration, the GND PROX lights are activated and a TERRAIN aural is repeated
until the envelope is exited. <2040>
C. Mode 3 -- Altitude Loss After Take--off
Mode 3 provides alerts when the aircraft loses a significant amount of altitude after
take-off, or low altitude go-around with gear or flaps not in a landing configuration. The
amount of altitude loss permitted before an alert is generated depends on the height of
the aircraft above the terrain.
The alert activates the GND PROX lights and generates a DON’T SINK, DON’T SINK
aural. The DON’T SINK, DON’T SINK aural is only repeated if the altitude loss
continues. The GND PROX lights will go out once a positive rate of climb is achieved.
<2040>
Vol. 1 18--80--5
NAVIGATION SYSTEMS
Ground Proximity Warning System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
D. Mode 4 -- Unsafe Terrain Clearance
Mode 4 provides alerts for insufficient terrain clearance with respect to phase of flight,
configuration and speed. Mode 4 has three sub-modes referred to as Mode 4A, Mode
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