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active. Select the DES NOW prompt and execute to start a VNAV ECON descent
of approximately 1250 feet per minute at ECON speed.
Upon reaching the planned descent path, VNAV commands pitch to maintain the
planned descent path and ECON speed. If the airplane reaches an altitude
constraint, VNAV changes to VNAV ALT until the planned descent path is
intercepted.
Navigation Data
Reference Navigation Data Page
The reference navigation data page displays data about waypoints, navaids,
airports, and runways. Use this page to inhibit FMC position updates from radio
navaids. The navaids are always available for manual tune, autotune and the ND.
1 Descend Now (DES NOW)
<
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DES NOW>
ECON DES
OFFPATH DES
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787 Flight Crew Operations Manual
Flight Management, Navigation -
FMC Cruise
11.42.32 Boeing Proprietary
Valid entries are any waypoint, navaid, airport, or runway from the navigation
database.
Entry changes to dashes when page is exited and then reselected.
Displays latitude of entered identifier.
MAG VAR - displays magnetic variation when entered identifier is a navaid.
LENGTH - displays runway length when entered identifier is a runway.
Valid entries are: VOR, VOR/DME, VORTAC, or DME identifiers from the
navigation database.
Inhibits use of entered navaids for updating by both FMCs.
Entries are blanked at flight completion.
Deleting or overwriting removes a previous inhibit.
1 Identification (IDENT)
2 LATITUDE
3Magnetic Variation (MAG VAR), LENGTH
4 NAVAID INHIBIT
>
INIT/REF INDEX
- -
<IDENT
<INDEX
- - - - - - - - - - - - - - - --- - --- ---
A
1
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O
ID E N T F R EQ
L O N G I T U D E
E L E V A T I O N
L A T I T U D E
M G V A R
F T
V O R O N L Y I N H I B I T
N A V A I D I N H I B I T
V O R / D M E N A V
O F F
REF NAV DATA
1600
113.30
----
----
A
----
----
E 5
N50 36.4
BC
N
NAV DATA>
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787 Flight Crew Operations Manual
Flight Management, Navigation -
FMC Cruise
Boeing Proprietary 11.42.33
Valid entries are VOR identifiers from the navigation database.
Inhibits use of only VOR portion of entered navaid for updating by both FMCs.
Entries are blanked at flight completion.
Deleting or overwriting removes a previous inhibit.
Push – displays the INIT/REF INDEX page.
Displays frequency of entered identifier when it is a navaid.
Displays longitude of entered identifier.
Displays elevation of entered identifier when it is a navaid, airport, or runway.
Push – alternately selects VOR/DME NAV ON (active) and OFF (inactive).
ON – VOR/DME data is supplied to the FMC for position updates. ON displays
in large green letters; OFF displays in small white letters.
OFF – VOR/DME data is not available to the FMC. OFF displays in large green
letters; ON displays in small white letters. DME–DME position updating is not
inhibited.
Selecting OFF displays ALL in both locations of the VOR ONLY INHIBIT line.
Fix Information Page
Four identical FIX INFORMATION pages are used to create waypoint fixes and
waypoints for the ND. Some of the created waypoints can be copied into the route.
The page can be cleared by selecting the ERASE FIX prompt or by using the DEL
key.
Magnetic/True Bearing
Magnetic or true fix bearings depend on airplane location. Refer to FMC Polar
Operations, Flight Management Navigation, section 31.
5 VOR ONLY INHIBIT
6 INDEX
7 Frequency (FREQ)
8 LONGITUDE
9 ELEVATION
10 VOR/DME NAV
787 Flight Crew Operations Manual
Flight Management, Navigation -
FMC Cruise
11.42.34 Boeing Proprietary
Valid entries are airports, navaids, place bearing distance, place bearing/place
bearing, along track, latitude/longitude, and waypoints from the navigation
database. The selected fix displays on the ND and is highlighted by a green circle.
Valid entries are XXX/YYY.Y:
• decimal values can be omitted
• leading zeros can be omitted for distance entries
• distance (up to 9999 nm) only entries must start with a slash (/).
Distances from the fix display on the ND as a circle around the fix.
When the circle intersects the active route, the ETA, DTG, and predicted altitude
at the intersection display for the closest of the two intersections.
Bearings from the fix display on the ND as radial lines from the fix.
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787机组操作手册Flight Crew Operations Manual 3(71)
