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Windshear cautions and warnings are triggered for tail wind and down draft conditions.
Windshear warnings generate a siren, a WINDSHEAR, WINDSHEAR, WINDSHEAR
aural and a red WINDSHEAR warning on the primary flight displays (PFDs).
Windshear alerts are triggered for headwind and updraft conditions. Windshear alerts
generate an amber WINDSHEAR alert on the PFDs.
Flight director command bars provide escape guidance automatically when a windshear
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 the
autopilot is not already disengaged). During those two seconds, the autopilot will follow
the windshear escape guidance.
Windshear warnings take priority over all other aural alerts and warnings, except a stall
warning.
Vol. 1 18--80--7
REV 56, Jan 31/03
NAVIGATION SYSTEMS
Ground Proximity Warning System
Flight Crew Operating Manual
CSP A--013
MASTER
Ground Proximity Warning System Interface Diagram <MST>
Figure 18---80---1
GPWS
ADC 2
SPS
VHF NAVs
RAD ALTs
AHRS 2
PSEU
FECU
TAS/VS/ALT
GS DEV
ACC/ATT
TERRAIN INHIBIT
WINDSHEAR
DISCRETES
LAT/LONG
GND TRK/SPEED
FLAP POS
AOA
WARNINGS
&
ALERTS
IAPS
PULL UP
GND
PROX
PULL UP
GND
PROX
TEST/GS CANCEL
AECU
EICAS
TCAS
STATUS
MESSAGES
AURAL
MESSAGES
AUDIO
PRIORITY
<0040>
<0015>
CB1--A15
AC BUS 1
GND PROX
WARN
<0025> IRS 2 ACC/ATT
WINDSHEAR DISCRETES
<0015>
<0040>
REV 56, Jan 31/03
Vol. 1 18--80--8
NAVIGATION SYSTEMS
Ground Proximity Warning System
Flight Crew Operating Manual MASTER
CSP A--013
Ground Proximity Warning System --- Controls <MST>
Figure 18---80---2
RDR / TERR
Used to select
weather radar
display, terrain
display or both.
Display Control Panel
Pilot’s and Copilot’s Side Panels
BRG FORMAT RANGE
RDR/TERR TFC
SOURCE
NAV
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.
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.
GPWS FLAP OVRD (Guarded)
Used to mute TOO LOW FLAPS
or TERRAIN aurals (Mode 4),
when a landing with less than
full flaps is desired.
Left and Right
Glareshield
GPWS / GS
GPWS -- Flashes (red) during ground
proximity warnings. Will stop flashing
when airplane has recovered from
warning envelope.
G/S (Glideslope) -- Flashes (amber)
at airplane descent below glideslope.
Will cancel alert when pressed in.
Switch is also used to initiate GPWS
system test, on the ground, or to
provide the glideslope cancel
function, when airborne (Mode 5).
Adjacent to Slat/Flap Lever
Center Pedestal
<0040>
<0040>
<0040> <0040>
<0040>
<0040>
<0040>
<0040>
Vol. 1 18--80--9
REV 56, Jan 31/03
NAVIGATION SYSTEMS
Ground Proximity Warning System
Flight Crew Operating Manual
CSP A--013
MASTER
Ground Proximity Warning System --- Windshear Detection and Alerting <MST>
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
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