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summarized below:
Passenger signs ...................................................................................ON
Advise passengers to fasten seatbelts prior to entering areas of
reported or anticipated turbulence. Instruct flight attendants to
check all passengers’ seat belts are fastened.
Structural Considerations
Flap extension in an area of known turbulence should be delayed as long
as possible because the airplane can withstand higher gust loads in the
clean configuration. Diversion to another airfield is recommended if
severe turbulence persists in the area.
Climb, Cruise, and Descent Considerations
After takeoff, and when established in a clean climb configuration, use of
the autoflight system is recommended for flight through turbulence.
During climb and descent, use of VNAV or flight level change may result
in excessive pitch changes as the AFDS attempts to fly speed with the
elevators. Therefore, vertical speed mode (speed on autothrottles) is
recommended for climb and descent in severe turbulence.
During cruise, VNAV and altitude hold modes both fly speed on
autothrottles and can be used in turbulence.
In severe turbulence during cruise, it may be necessary to disconnect the
autothrottles to prevent excessive thrust changes. Thrust setting guidance
is available on EICAS when VNAV is engaged. Set TPR at or slightly
above the magenta VNAV target TPR indication. Change thrust setting
only if required to modify an unacceptable speed trend.
787 Flight Crew Operations Manual
Supplementary Procedures -
Adverse Weather
SP.16.14 Boeing Proprietary
Manual Flight in Severe Turbulence
If manual flight in severe turbulence becomes necessary, trim the airplane
for the turbulent air penetration speed. Control the airplane pitch attitude
with the elevators using the attitude indicator as the primary instrument. In
extreme drafts, large altitude changes may occur. Do not make sudden
large control inputs. Corrective actions to regain the desired attitude
should be smooth and deliberate. Altitude variations are likely in severe
turbulence and should be allowed to occur if terrain clearance is adequate.
Control airplane attitude first, then make corrections for airspeed, altitude,
and heading.
787 Flight Crew Operations Manual
Supplementary Procedures -
Adverse Weather
Boeing Proprietary SP.16.15
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.
787 Flight Crew Operations Manual
Supplementary Procedures -
Adverse Weather
SP.16.16 Boeing Proprietary
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.
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787机组操作手册Flight Crew Operations Manual 1(37)
