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indicate that the airplane is entering an increasing
performance windshear condition.
Flashes (red) then comes on steady to indicate that a
severe decreasing performance windshear condition has
been encountered. Accompanied by aural warning.
(SIREN)
WINDSHEAR
WINDSHEAR
WINDSHEAR
<0015>
Pitch Limit Marker (amber)
(alpha--margin indicator)
Displayed during windshear warning or alert.
Comes on for a minimum of 60 seconds.
Displays amount of pitch attitude change that can
be made before airplane reaches stall angle of attack.
H. Terrain / Obstacle Awareness Alerting and Display <0040>
The terrain awareness alerting function uses airplane geographical position, aircraft
altitude, and a terrain database to predict potential conflicts between the aircraft flight
path and the terrain.
The terrain awareness alerting continuously computes terrain clearance envelopes
ahead of the aircraft. Two envelopes are computed, one corresponding to a terrain
caution alert level and one corresponding to a terrain warning alert level.
Terrain data is displayed on the multifunctional displays by pressing RDR / TERR on the
display control panel. The terrain display can be overlaid on the multifunctional display
in navaid sector and present position map formats. The terrain display is depicted as
variable density dot patterns in green, yellow or red. The density and colour are a
function of how close the terrain is relative to airplane altitude. When the conditions for
either a terrain awareness caution or warning are detected, the terrain display
automatically “pops-up” on both multifunctional displays and the range defaults to
10nm. Terrain more than 2000 feet below the airplane, or within 400 feet (vertical) of
the nearest runway elevation is not displayed.
When the airplane penetrates the caution envelope boundary, the GND PROX lights
flash and the CAUTION TERRAIN, CAUTION TERRAIN aural is generated. Terrain
caution areas are shown in solid yellow on the terrain display.
REV 56, Jan 31/03
Vol. 1 18--80--10
NAVIGATION SYSTEMS
Ground Proximity Warning System
Flight Crew Operating Manual MASTER
CSP A--013
When the aircraft penetrates the warning envelope boundary, the PULL UP lights flash
and the TERRAIN, TERRAIN, PULL UP aural is generated. Terrain warning areas are
shown in solid red on the terrain display.
An obstacle database is included within the terrain database. When an obstacle
caution threat is detected the GND PROX lights flash and a CAUTION OBSTACLE,
CAUTION OBSTACLE aural is generated. Obstacle cautions are shown in solid yellow
on the terrain display. When an obstacle warning threat is detected the PULL UP lights
flash and an OBSTACLE, OBSTACLE, PULL UP aural is generated. Obstacle
warnings are shown in solid red on the terrain display.
I. Peaks Display Mode <0040>
Peaks display mode is a customer option as an enhancement to the EGPWS terrain
display and is enabled via a program pin on system installation.
Peaks mode allows terrain below the aircraft to be viewed on the terrain display during
cruise flight. At altitudes safely above all terrain for the display range chosen, the
terrain is displayed, independent of aircraft altitude, emphasizing the highest and lowest
elevations to provide increased situational awareness in the event of unplanned decent
or enroute deviation and for previewing terrain prior to decent.
Two elevation numbers indicating the highest and lowest terrain currently being
displayed are overlaid on the display. The elevation numbers indicate terrain in
hundreds of feet above sea level (MSL).
J. Terrain Clearance Floor <0040>
Terrain clearance floor is an increasing terrain clearance envelope around the nearest
runway directly related to the distance from that runway. Terrain clearance floor alerts
are based upon current airplane position, nearest runway centre point position, radio
altitude, and a database of hard-surfaced runways whose length is greater than 3500
feet. Terrain clearance floor compliments Mode 4 alerts by covering insufficient terrain
clearance even when in a landing configuration.
Penetration of the alert envelope activates the GND PROX lights and generates a TOO
LOW TERRAIN aural. The aural will occur once upon initial envelope penetration and
one time thereafter for each 20% degradation in altitude. The GND PROX lights remain
on until the aircraft exits the alert envelope.
Vol. 1 18--80--11
REV 56, Jan 31/03
NAVIGATION SYSTEMS
Ground Proximity Warning System
Flight Crew Operating Manual
CSP A--013
MASTER
Ground Proximity Warning System Terrain Display <0040>
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