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warning occurs or when the TOGA (take-off/go-around) switch(s) on the thrust levers
are pressed. Pitch limit indicators (alpha-margin indicators) will appear on both primary
flight displays for a windshear warning or alert.
The autopilot is automatically disengaged two seconds after windshear warning (if
autopilot not already disengaged). During those two seconds, the autopilot will follow
the windshear escape guidance.
Vol. 1 18--80--7
NAVIGATION SYSTEMS
Ground Proximity Warning System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Windshear warnings take priority over all other aural alerts and warnings, except a stall
warning.
WindshearGround Proximity Warning System ---
Detection and Alerting <1015, 2040>
Figure 18---80---3
Flight Director Command Bars (magenta)
Provide escape guidance during a windshear
warning or when TOGA is selected on thrust levers.
Windshear Message
Flashes (amber) then comes on steady to
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
Pitch Limit Marker (amber)
(alpha--margin indicator)
Displayed during windshear warning or alert.
Displays amount of pitch attitude change that
can be made before the airplane reaches stall
angle of attack.
H. Terrain / Obstacle Awareness Alerting and Display <2040>
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 color 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.
Vol. 1 18--80--8
NAVIGATION SYSTEMS
Ground Proximity Warning System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
At altitudes safely above all terrain within the display range chosen, the terrain
displayed regardless of the aircraft altitude. Two elevation numbers (in hundreds of feet
MSL) indicating the highest and the lowest terrain currently being displayed are overlaid
on the display. Terrain within 400 feet (vertical) of the nearest runway elevation is not
displayed. <2040>
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.
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. Terrain Clearance Floor <2040>
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.
　
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