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9 Flight Path Angle (FPA), Vertical Bearing (V/B), Vertical Speed (V/S)
10 FORECAST
11 Descend Direct (DES DIR)
12 Descend Now (DES NOW)
787 Flight Crew Operations Manual
Flight Management, Navigation -
FMC Descent and Approach
11.43.6 Boeing Proprietary
Displays the transition level.
The transition level can be specified by the arrival procedure. The default
transition level is FL180.
Above transition level, altitudes are in flight levels. Below transition level,
altitudes are in thousands of feet.
Valid entry is an altitude or flight level.
Enter altitude of forecast wind data.
Altitudes and flight levels can be entered in any order. Entries are not sorted.
Execute not necessary.
Push – transmits a datalink request for descent wind data.
Enter the altitude where anti–ice is first turned on during the descent.
1 Transition Level (TRANS LVL)
2 Altitude (ALT)
3 FORECAST REQUEST
4 Thermal Anti–Ice On Altitude (TAI/ON ALT)
<REQUEST
>
C
o
o
o
o
T R A N S L V L
A L T
F O RE A ST
K T
K T
K T
K T
W I N D D I R / S P D
T A I / O N A L T
3/3
-
-
-
DESCENT FORECAST
DES
--- /--
--- /--
--- /--
090 /105
-----
FL280
FL180
-----
-----
-----
FORECAST
ACT ECON DES
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - - - - - - -
>
1
2
3
4
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787 Flight Crew Operations Manual
Flight Management, Navigation -
FMC Descent and Approach
Boeing Proprietary 11.43.7
Enter the wind direction/speed for the specified altitude. Initial entry must have
wind direction and speed, subsequent entries may have one or the other.
Execute not necessary.
Push – displays the DES page.
Offpath Descent Page
The offpath descent page allows the analysis of descent performance off the
present route of flight, direct to a selected waypoint. Data entered on the page
shows clean and drag descent ranges on the page and on the ND. The ranges are
based on an entered waypoint and altitude constraint. The range can be used to
determine if the altitude constraint can be met in a direct descent to the waypoint.
The FMC puts the last descent waypoint with an altitude constraint into DES TO.
The ECON SPD, SPD TRANS, SPD RESTR, and DES data are the same as the
DES page.
5 Wind Direction/Speed (WIND DIR/SPD)
6 Descent (DES)
ACT ECON DES 3/3
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
DES >
<OFFPATH
<
DES DIR>
OFFPATH DES
D T G
150
D E S T T O
E C O N S P D
S P D T R A N S
S P D R E S T R
D I S P L A Y
O F F
N M
T O D R A G
N M
T O C L E A N
S P D / A L T
ON
89
-13
170/2800
---/-----
240/10000
.805/270
PELLY
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DES
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787 Flight Crew Operations Manual
Flight Management, Navigation -
FMC Descent and Approach
11.43.8 Boeing Proprietary
The waypoint for a direct–to descent. Usually, this is the E/D waypoint from the
active route. Manual entry of waypoints on or off of the route are allowed. The
DTG calculations are for a descent direct to the selected waypoint.
When within 150 feet of the DES TO altitude for a waypoint other than the E/D
waypoint, the display automatically changes the DES TO waypoint to the E/D
waypoint from the DES page.
A waypoint is entered for direct–to analysis.
Displays the straight line distance to the entered waypoint.
Displays the speed/altitude constraint for the entered waypoint.
A manual waypoint entry displays boxes for manual speed and altitude entry.
Distance to the clean descent circle. The distance is negative when a clean descent
is no longer possible.
A clean circle assumes no drag devices are used for descent.
A direct descent to the DES TO waypoint at a SPD/ALT constraint is possible
when the airplane is outside the clean circle. The clean circle displays on the ND
when the DISPLAY prompt is ON.
Distance to the drag descent circle. The distance is negative when a drag descent
is no longer possible.
A drag circle assumes speedbrakes are UP for descent.
A direct descent to the DES TO waypoint at a SPD/ALT constraint is possible
when the airplane is outside the drag circle. The drag circle displays on the ND
　
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