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• waypoint speed constraints.
Displays the end of descent altitude and waypoint.
The end of descent point is a waypoint in the descent phase with the lowest
altitude constraint.
The altitude displays in magenta when altitude becomes the FMC altitude target.
Page is blank if no E/D point exists.
Both CAS and Mach values display.
ECON SPD –
• economy speed based on cost index
• displays CAS and Mach values.
SEL SPD –
• displays when flight crew enters speed
• displays constraint speed on transitioning into a selected speed segment
(waypoint speed constraint, SPD RESTR, or SPD TRANS)
• valid entries are CAS or Mach.
The FMC commanded speed is magenta. Initially, Mach is magenta and CAS is
white. Below CAS/Mach transition altitude, CAS is magenta and Mach is white.
1 Page Title
2 End Of Descent At (E/D AT)
3 Economy Speed (ECON SPD), Selected Speed (SEL SPD)
787 Flight Crew Operations Manual
Flight Management, Navigation -
FMC Descent and Approach
11.43.4 Boeing Proprietary
The transition speed is usually 10 knots less than the destination airport limiting
speed from the navigation database. When no airport limit speed exists, the default
speed of 240 knots displays. The transition altitude is the point the transition speed
is active for the destination airport. When no altitude exists in the navigation
database, the default of 10,000 feet displays.
Speed displays in magenta when it is the FMC speed target.
Blanks below SPD TRANS altitude.
Deleting causes the airplane to fly economy or selected speed if not limited by a
waypoint constraint or speed restriction.
Speed restrictions at altitudes higher than E/D altitude and not associated with
specific waypoints are manually entered on this line.
Valid entry is a CAS and altitude (example 240/8000). Entry may be deleted.
Magenta when it is FMC command speed.
Push – displays the OFFPATH DES page.
Displays the next waypoint constraint from the RTE LEGS page.
XXXXX is:
• the waypoint identifier
• HOLD AT XXXXX
• AT VECTORS
• 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.
Speed and/or altitude display in magenta when they are the FMC target values.
Displays the reference vertical bearing waypoint identifier and altitude.
Displays pilot entered waypoint/altitude data if entered.
Defaults to the next descent waypoint constraint (displayed in 1R) if no pilot entry.
For window altitude constraints, displays the upper altitude if the airplane is above
it, otherwise the lower altitude is displayed.
Displays dashes if no constraint exists in the descent portion of the flight plan.
4 Speed Transition (SPD TRANS)
5 Speed Restriction (SPD RESTR)
6 Off Path Descent (OFFPATH DES)
7 AT XXXXX
8 Waypoint/Altitude (WPT/ALT)
787 Flight Crew Operations Manual
Flight Management, Navigation -
FMC Descent and Approach
Boeing Proprietary 11.43.5
Valid entry is any waypoint/altitude combination where the waypoint exists in the
Nav Database, or in the flight plan (including lat/lon waypoints and reporting
points) and the altitude is below the current airplane altitude.
Display is blank if no waypoint/altitude combination is displayed at line select key
3R or if the airplane is below the altitude displayed in 3R.
FPA –
• Displays the current flight path angle of the airplane
• Display is blank for FPA greater than positive 0.05 degrees.
V/B displays the calculated vertical bearing required to achieve the altitude at the
waypoint in line 3R.
V/S displays the vertical speed required to achieve the altitude at the waypoint in
line 3R.
Push – displays the DESCENT FORECAST page.
Push – deletes all waypoint altitude constraints between the airplane altitude and
the MCP altitude. FMC cruise altitude is not affected.
Displays in descent phase with altitude constraint between airplane and E/D.
Push –
• starts a 1250 feet per minute descent schedule until intercepting the
planned descent path
• activates the FMC descent phase
Displays when the descent phase is not active.
Descent Forecast Page
The 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.
The primary entries are wind direction and speed for up to four descent altitudes,
and the altitude that anti–ice is turned on.
　
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