787 Flight Crew Operations Manual
DO NOT USE FOR FLIGHT
Supplementary Procedures -
Adverse Weather
Copyright © The Boeing Company. See title page for details.
D615Z003-TBC SP.16.19
Precautions
If windshear is suspected, be alert to any of the danger signals and be
prepared for the possibility of an inadvertent encounter. The following
precautionary actions are recommended if windshear is suspected:
Takeoff
• use maximum takeoff thrust instead of reduced thrust
• for optimum takeoff performance, use flaps 20 for takeoff unless
limited by obstacle clearance and/or climb gradient. Flaps 15 may
be used as a precautionary setting and will provide nearly
equivalent performance to Flaps 20
• use the longest suitable runway provided it is clear of areas of
known windshear
• use the flight director after takeoff
• consider increasing VR speed to the performance limited gross
weight rotation speed, not to exceed actual gross weight VR+20
knots. Set V speeds for the actual gross weight. Rotate at the
adjusted (higher) rotation speed. This increased rotation speed
results in an increased stall margin, and meets takeoff performance
requirements. If windshear is encountered at or beyond the actual
gross weight VR, do not attempt to accelerate to the increased VR,
but rotate without hesitation
• be alert for any airspeed fluctuations during takeoff and initial
climb. Such fluctuations may be the first indication of windshear
• know the all-engine initial climb pitch attitude. Rotate at the
normal rate to this attitude for all non-engine failure takeoffs.
Minimize reductions from the initial climb pitch attitude until
terrain and obstruction clearance is assured, unless stick shaker
activates
• crew coordination and awareness are very important. Develop an
awareness of normal values of airspeed, attitude, vertical speed and
airspeed build-up. Closely monitor vertical flight path instruments
such as vertical speed and altimeters. The pilot monitoring should
be especially aware of vertical path instruments and call out any
deviations from normal
• should airspeed fall below the trim airspeed, unusual control
column forces may be required to maintain the desired pitch
attitude. Stick shaker must be respected at all times
February 13, 2009
To Next Page
Loading...
