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will flash for 5 seconds then remain steady.
· When the EGPWC senses an increasing tailwind (or decreasing headwind) and/or a severe
downdraft a decreasing performance annunciation WINDSHEAR will be posted on the PFD.
It will flash for 5 seconds, then remains steady and an aural siren and “WINDSHEAR,
WINDSHEAR, WINDSHEAR” warning are activated.
WINDSHEAR
WINDSHEAR
WINDSHEAR
20
10 WIND
SHEAR
20
10 WIND
SHEAR
SIREN
INCREASING PERFORMANCE DECREASING PERFORMANCE
GF1710_078
20
10
20
10
"WINDSHEAR
WINDSHEAR
WINDSHEAR"
DOWNDRAFT (FEET/MINUTE)
CAUTION
WINDSHEAR
WINDSHEAR
WARNING AREA
WSHR
DECREASING
HEADWIND
(KNOTS/SECOND)
INCREASING
HEADWIND
(KNOTS/SECOND)
GF1710_079
UPDRAFT (FEET/MINUTE)
AREA
3000
1000
2000
1000
2000
3000
6 4 2 00 2 4 6
NAVIGATION
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
17−10−42
EGPWS MODES (CONT'D)
Windshear Flight Director Mode Annunciations
The WSHR mode can only be activated when a windshear warning is present. The mode can be
activated by depressing either TOGA button on the thrust levers or by pushing either thrust lever
beyond 37 degrees. If however the airplane is already in TOGA mode, or has either thrust lever
beyond 37 degrees at the point at which the windshear warning is posted, the mode sets
automatically.
The WSHR mode cannot be cancelled when a windshear warning persists. Any selection of the
FD or AP engage buttons are ignored but yaw damper function is unaffected. Once the windshear
warning has cleared, WSHR mode can be cancelled by any selection of FD or engagement of AP.
A WSHR mode annunciation is displayed on the vertical mode and a ROL mode annunciation is
displayed on the lateral mode. GF1710_080
WINDSHEAR
160 ROL 3 000
20 20
AP1 WSHR
WIND
SHEAR
180
170
160
150
145
6
1500
1000
WINDSHEAR
WINDSHEAR
ROL AP1 WSHR
TOGA Buttons
Windshear Escape Guidance
The windshear mode will provide windshear escape guidance consisting of lateral and vertical
modes as follows:
· Vertical guidance will provide optimal escape guidance.
· Lateral guidance will be provided to maintain wings level.
A pitch limit indicator and windshear annunciation are displayed on both PFDs, during an
increasing or decreasing performance windshear. The pitch limit indicator will differ depending on
selection of Single Cue or Cross Pointer.
GF1710_081
WINDSHEAR
WINDSHEAR
WINDSHEAR
20
10
SIREN
20
10
SINGLE CUE CROSS POINTER
PITCH LIMIT INDICATOR
WIND
SHEAR
WIND
SHEAR
20
10
20
10
Windshear escape guidance is designed to allow the airplane to accelerate through the windshear
where airplane performance permits. Where airplane performance does not permit, the WSHR
mode will prevent the airplane from descending. The WSHR mode will command a descent if the
airplane approaches the stall warning point, to prevent the airplane from stalling.
For an increasing performance windshear, guidance will be given to maintain a slightly positive
flight path angle (1.5 degrees) until airspeed (CAS) reaches 20 knots above the CAS recorded
when the windshear mode was set. Guidance is then provided to climb the airplane at that speed.
NAVIGATION
REV 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
Volume 2
17−10−43
EGPWS MODES (CONT'D)
Windshear Escape Guidance (Cont’d)
For a decreasing performance windshear, guidance will be provided to maintain a slightly positive
flight path angle (1.5 degrees) until the AOA increases to within 2 degrees of stick shaker firing
angle. The airplane will then be allowed to descend maintaining this margin to shaker. Between
400 and 10 feet (RAD ALT) margin to stick shaker will be reduced linearly to provide guidance at
stick shaker AOA.
Terrain Awareness Alerting
The terrain alerting function computes minimum terrain clearance envelopes for areas along the
flightpath of the airplane. The function uses airspeed and flightpath angle data in conjunction with
a database containing worldwide topographical relief information in grid format. The database
does not account for manmade
obstructions except for all known manmade
obstacles in Canada
and the United States.
The terrain display is available by pressing “TERR” button on the MFD control panel. Terrain within
　
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