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Rev 2A, Apr 11, 2005 Flight Crew Operating Manual Volume 2
Mode 7 . Windshear Warning
Mode 7 provides alerts and warnings in the event that significant windshear is detected by the EGPWC. Mode 7 is active during take-off and landing phase of flight only, between 10 and 1500 feet AGL. There are two types of windshear warnings: increasing performance (updraft/headwind) and decreasing performance (downdraft/tailwind).
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When the EGPWC senses an increasing headwind (or decreasing tailwind) and/or a severe updraft, an increasing performance annunciation WINDSHEAR will be posted on the PFD. It will flash for 5 seconds then remain steady.
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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.
SIREN
WINDSHEAR WINDSHEAR WINDSHEAR
INCREASING PERFORMANCE DECREASING PERFORMANCE
Volume 2 Flight Crew Operating Manual Rev 2A, Apr 11, 2005
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.
Windshear Escape Guidance
The windshear mode will provide windshear escape guidance consisting of lateral and vertical modes as follows:
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Vertical guidance will provide optimal escape guidance.
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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.
SINGLE CUE CROSS POINTER
GF1710_081
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.
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