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Wind data entered at another waypoint (at the same altitude) changes wind data
downtrack from the second entered waypoint either to the end of the track, or to
the next entered wind. The wind data before the second entered waypoint does not
change. Therefore, enter wind data for waypoints closest to the airplane, then enter
wind data for waypoints downtrack from the airplane.
For example: at FL 350, 100°/085 is entered at waypoint OED. All waypoints in
the route have the OED wind data. Then, additional wind data entered at OAK
changes the wind data at OAK and through the end of the route.
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.
5 FUEL
6 WIND DATA REQUEST
SECOND WAYPOINT (OAK) - AT FL350, 150o/120 WIND ENTERED AT OAK
FIRST WAYPOINT (OED) - AT FL350, 100o/085 WIND ENTERED AT OED
100o/085 150o/120 150o/120 150o/120 150o/120
BTG OED RBL OAK AVE CRM PJM
BTG OED RBL OAK AVE CRM PJM
100o/085 100o/085
100o/085 100o/085 100o/085 100o/085 100o/085 100o/085 100o/085
787 Flight Crew Operations Manual
Flight Management, Navigation -
FMC Cruise
11.42.38 Boeing Proprietary
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.
The FMC calculates step climb points as a function of lateral flight plan, speed
mode, present and step to altitude, and gross weight. The gross weight for a step
from present CRZ ALT to STEP TO altitude is the gross weight at which the
optimum altitude is halfway between the two altitudes.
787 Flight Crew Operations Manual
Flight Management, Navigation -
FMC Cruise
Boeing Proprietary 11.42.39
Displays ACT XXXXX, where XXXXX is the waypoint at which winds have
been entered.
When a route is being modified, MOD in shaded white as shown in the page title.
Enter altitude or flight level for wind entries. Altitude data entry possible only on
line 1L.
After data entry, data is sorted by altitude and placed in lines 1 through 4. Dashes
display on right side of line for wind direction and speed entry.
When all four lines have data, one must be deleted before new data can be entered.
Displays the altitude or flight level for wind or OAT entries.
Data entered on 1L displays on lines 1 through 4. Data entry is not possible in lines
2L through 4L.
OAT entries made using the ALT/OAT line display in large font. Calculated OAT
based on standard lapse rate display in small font.
1 Page Title
2 Altitude (ALT)
3 Altitude/Flight Level Data
w8mt-34-00-0108
ACT RTE 1 DATA
WA Y P O I N T F U EL
ELN 4 5 . 0
MODELN WIND
o
X/X
E T A WI ND
X / X
1 3 0 5 ZW>
A L T OA T D I R / S PD
K T
K T
K T
A L T / O A T
C
-25 oC
-33 oC
- 41oC
--- ---
o
FL200/-31
o /
280 / 50
280o / 70
FL210
FL250
17000
-----
<ERASE RTE DATA>
- - - - - - - - - - - - - - - --- - --- --- - - - - - - - - - - - - -
2
3
4
1
5
6
7
787 Flight Crew Operations Manual
Flight Management, Navigation -
FMC Cruise
11.42.40 Boeing Proprietary
Push – removes modified data.
Displays dashes after altitude/flight level entry in the ALT line. Enter wind
direction and speed for the altitude.
Displays entered wind direction and speed for related altitude.
Values propagate in both directions for the first wind entered and downtrack for
　
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