787 Flight Crew Operations Manual
DO NOT USE FOR FLIGHT
Supplementary Procedures -
Adverse Weather
Copyright © The Boeing Company. See title page for details.
SP.16.18 D615Z003-TBC
Windshear
Windshear is a change of wind speed and/or direction over a short distance
along the flight path. Indications of windshear are listed in the
Non-Normal Maneuvers section in this manual.
Avoidance
The flight crew should search for any clues to the presence of windshear
along the intended flight path. Presence of windshear may be indicated by:
• thunderstorm activity
• virga (rain that evaporates before reaching the ground)
• pilot reports
• low level windshear alerting (LLWAS) warnings
Stay clear of thunderstorm cells and heavy precipitation and areas of
known windshear. If the presence of windshear is confirmed, delay takeoff
or do not continue an approach.
February 13, 2009
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