787 Flight Crew Operations Manual
DO NOT USE FOR FLIGHT
Flight Management, Navigation -
Flight Management System
Operation
Copyright © The Boeing Company. See title page for details.
11.31.18 D615Z003-TBC
ND Map Displays
The route displays on the ND in the map, map center, mini-map and plan modes.
The display color and format represent the following status:
• an inactive route displays as a cyan dashed line
• an activated, but not yet executed route, displays as an alternating
cyan/white dashed line
• the active route displays in magenta
• modifications to an active route display as dashed white lines
• modified waypoints display in white
• executed route offsets display as a dashed magenta line
The ND displays the FMC position at the apex of the airplane symbol. All ND map
data displays relative to this apex.
When adequate GPS or radio updating is not available, the ND map may display
a shift error. This error results in the displayed position of the airplane, route,
waypoints, and navigation aids being shifted from their actual position. An
undetected, across track map shift may result in the airplane flying a ground track
that is offset from the desired track. An undetected, along-track map shift may
result in the flight crew initiating altitude changes earlier or later than desired. In
either case, an undetected map shift may compromise terrain or traffic separation.
[Option – Dual ADF]
Map shift errors can be detected by comparing the position of the airplane on the
ND map with data from the ILS, VOR, DME, and ADF systems.
Vertical Navigation (VNAV)
VNAV provides vertical profile guidance through the climb, cruise, and descent
phases of flight.
Note: The altimeter must be used to verify each crossing altitude in a VNAV
procedure.
Speed/Altitude Constraints
VNAV controls the path and speed to comply with waypoint crossing constraints.
Waypoint crossing constraints are entered on the LEGS page waypoint line by
pushing the applicable key on the right side of the CDU. Barometric altitude
constraints must be below the cruise altitude to be valid. Values entered as part of
a procedure and manually entered constraints are shown in large font. FMC
predicted values do not act as constraints, and display in small font.
A waypoint constraint is magenta when it is active. The constraint does not have
to be in line 1 to be active. Waypoints can have altitude or airspeed/altitude
constraints.
August 14, 2009
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