787 Flight Crew Operations Manual
DO NOT USE FOR FLIGHT
Flight Management, Navigation -
FMC Cruise
Copyright © The Boeing Company. See title page for details.
11.42.40 D615Z003-TBC
Entered wind data are mixed with sensed wind data for performance predictions.
The FMC uses entered winds for predictions far ahead of the airplane and sensed
winds close to the airplane. The FMC mixes these winds for predictions in
between. Sensed winds display on the progress page 2/4.
Inaccurate forecast wind and temperature information degrades the accuracy of
the recommended altitude displayed on the cruise page.
The FMC adjusts ECON climb speed and top of climb using entered and/or sensed
wind speed. FMC calculated ECON climb speed may fluctuate if top of climb is
near a waypoint with approximately a 45 degree or larger track change and if a
significant wind velocity has been entered or is predicted for that waypoint. This
fluctuation does not occur when using a manually entered climb speed or speed
intervention.
Wind Page
The wind page is used to enter forecast winds and temperatures at waypoints for
up to four altitudes to enhance VNAV performance.
This data can be uplinked or manually entered.
Wind speed and direction are entered for the specific altitudes.
OAT can be entered for any one altitude. The FMC calculates the temperature for
the entered altitudes using the standard lapse rate.
The altitudes are entered first. The altitudes can be entered in any order and are
sorted and displayed in ascending order.
Second Waypoint (OAK) - AT FL350, 150
o
/120 Wind entered at OAK
First Waypoint (OED) - AT FL350, 100
o
/085 Wind entered at OED
150
o
/120150
o
/120150
o
/120100
o
/085 150
o
/120
RBL AVEOAK CRM PJMOEDBTG
RBL AVEOAK CRM PJMOEDBTG
100
o
/085 100
o
/085
100
o
/085 100
o
/085 100
o
/085100
o
/085100
o
/085 100
o
/085100
o
/085
February 15, 2010
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