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11.43.4 D6-30151-425
Flight Management, Navigation -
FMC Descent and Approach
XXXX is:
• the waypoint identifier
• HOLD AT XXXXX
• ATVECTORS
• AT(INTC)
The constraint is speed/altitude. Blank when no constraint exists.
Can be deleted on this page.
VNAV commands the lesser of constraint speed or present performance speed.
8 FORECAST
Push – displays DESCENT FORECAST page.
9 Descend Direct (DES DIR), Descend Now (DES NOW)
DES DIR -
Displays in descent phase with altitude constraint between airplane and E/D.
Push – deletes all waypoint altitude constraints between the airplane altitude and
the MCP altitude. FMC cruise altitude is not affected.
DES NOW -
Displays when T/D created and the descent phase is not active.
Push –
• provides guidance to descend at approximately 1,250 feet per minute
using the active descent speed schedule. Thrust levers may be manually
repositioned to adjust vertical speed. Upon intercepting the planned
descent path, the airplane transitions to the planned descent path
• activates FMC descent phase
December 01, 1999
747 Operations Manual
Flight Management, Navigation -
FMC Descent and Approach
Copyright © The Boeing Company. See title page for details.
D6-30151-425 11.43.5
Descent Forecast Page
Descent forecast page is used to enter wind data for descent, and the altitude at
which anti–ice use is anticipated for more accurate descent path calculation.
Primary entries are wind direction and speed for up to four descent altitudes, and
the altitude anti–ice is to be turned on. Entries can be manual or uplinked.
1 Transition Level (TRANS LVL)
Transition level can be specified by the arrival procedure. The default transition
level is FL180.
Valid entry is an altitude or flight level.
The FMC uses transition level to change displays between FL and feet.
2 Altitude (ALT)
Valid entries are altitudes and flight levels.
Altitudes and flight levels can be entered in any order. Entries are not sorted.
- -- F O R E C A S T U P L I N K - -- -
<LO AD P U R GE>
- ---- -- -`/ -- - K T
5 00 0 13 0`/ 2 9 K T
DES CE NT FOR ECAS
T R A N S L V L
-- ---
A L T
F L1 80
F L2 90
TA I / O N A LT
T
W I N D D I R / S P D
090` / 105 K T
F L2 10 07 8`/ 6 9 K T
FMC COMM 1/2
<DES FORECAST
XXXX DES
FORECAST>
1
2
3
4
5
6
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
11.43.6 D6-30151-425
Flight Management, Navigation -
FMC Descent and Approach
3 REQUEST SEND, FORECAST UPLINK LOAD, DATALINK
Displays SEND prompt when datalink READY and no uplink pending.
SEND -
Push -
• transmits datalink request for descent wind data
• displays scratchpad message DES FORECST UPLINK READY and
displays LOAD and PURGE prompts when an uplink containing descent
forecast uplink data received and error checks passed
LOAD -
Push -
• accepts and displays request for descent wind data
• displaysSENDprompt
• changes PURGE prompt to DES prompt
Displays DATA LINK and data line NO COMM, VOICE, or FAIL if datalink is
not READY.
4 Thermal Anti–Ice On Altitude (TAI/ON ALT)
Valid entry is altitude or flight level where anti–ice is to be first turned on during
the descent.
5 Wind Direction/Speed (WIND DIR/SPD)
Valid entry is wind direction/speed for the specified altitude. Initial entry must
have wind direction and speed, subsequent entries may have one or the other.
6 FORECAST UPLINK PURGE, Descent (DES)
Displays PURGE prompt when an uplink containing descent forecast uplink data
received and error checks passed.
PURGE -
Push - rejects uplinked descent forecast data.
DES -
Push - displays the DES page.
Offpath Descent Page
Offpath descent page allows the analysis of descent performance direct to a
selected waypoint. Data entered displays clean and drag descent ranges on the
page and on the ND. Ranges are based on an entered waypoint and altitude
constraint. Range can be used to determine if the altitude constraint can be met in
a direct descent to the waypoint.
December 01, 1999
747 Operations Manual
Flight Management, Navigation -
FMC Descent and Approach
Copyright © The Boeing Company. See title page for details.
D6-30151-425 11.43.7
The FMC displays the last descent waypoint with an altitude constraint in DES
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