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FMC COMM 1/2
<RTE DATA
RTE DATA>
RTE 1 LEGS
WIND
RTE DATA>
LEGS
SEND
- - RE Q UES T
>
1
5
3 6
2
4
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
11.42.16 D6-30151-425
Flight Management, Navigation -
FMC Cruise
1 ETA
Displays ETA for waypoint.
2 Waypoint (WPT)
Displays identifier for waypoint.
3 LEGS, ERASE
LEGS -
Push – displays RTE LEGS page.
Displays ERASE prompt when an uplink containing enroute wind data is loaded.
ERASE -
Push -
• rejects uplinked enroute wind data
• displays LEGS prompt
4 FUEL
Displays the FMC calculated fuel remaining at the waypoint.
Note: ETA and estimated fuel calculations assume a direct flight across route
discontinuities.
5 WIND (W>/>)
W> - indicates waypoint winds have been entered.
> - winds not entered.
Push – displays WIND page for the selected waypoint.
6 REQUEST SEND, WIND DATA LOAD
Blank when airplane is active on descent or approach.
Displays SEND prompt when datalink ready and airplane is not active on descent
or approach.
Displays LOAD prompt when uplink containing enroute wind data received and
error checks passed.
SEND -
April 01, 2001
747 Operations Manual
Flight Management, Navigation -
FMC Cruise
Copyright © The Boeing Company. See title page for details.
D6-30151-425 11.42.17
Push –
• transmits a datalink request for wind and descent forecast data
• displays LOAD prompt and scratchpad message WIND DATA UPLINK
READY when an uplink containing enroute wind data received and error
checks passed
• displays scratchpad message DES FORECST UPLINK READY and
displays LOAD and PURGE prompts on the DESCENT FORECAST
page when an uplink containing descent forecast uplink data received and
error checks passed
LOAD -
Push -
• applies enroute wind data to route and results in a modification
• displays ERASE and SEND prompts
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 altitude. The FMC calculates the temperature for the
entered altitudes using the standard lapse rate.
The FMC applies the first entered wind data to all waypoints in the flight plan.
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.
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 PROGRESS page 2.
The FMC calculates step climb points based on several performance factors, but
does not calculate step climb points based on entered winds at the STEP TO
altitude.
April 01, 2001
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
11.42.18 D6-30151-425
Flight Management, Navigation -
FMC Cruise
1 Page Title
Displays XXXXX, where XXXXX is the waypoint for which winds display.
2 Altitude (ALT)
Valid entry is altitude or flight level on line 1L.
After entry, data are sorted by altitude and display 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 altitude can be
entered.
3 OAT
Data entry not possible.
OAT displays the outside air temperature. Entries made using the ALT/OAT line
display in large font. Calculated OAT based on standard lapse rate display in small
font.
7 0 1 9 3
- - - - - - - - - - - - --- - - - - - - - --
R T E DA TA>
- -- --/ -- -` C
A L T / O A T
3 1 7 ` / 9
3 1 5 ` / 0 0
K T
1 K T
C
C
- 4 1 `
- 5 3 `
F L 2 7 0
F L 3 3 0
- - - - -
AL T OA D IR/ S P D
N 4 W 1 W I N D S / 1
3
T
W>
ACT RTE 1 DATA
2
　
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