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If the number of waypoints in the existing route plus the new waypoints added to
reach the new intersection (XJ52) exceeds 120, the FMC rejects the second entry.
Repeated attempts to enter the second airway result in an FMC resynchronization.
Delaying modification of the route until the number of waypoints to reach the new
intersection does not exceed 120 prevents resynchronization.
April 01, 2001
747 Operations Manual
Flight Management, Navigation -
Flight Management System
Operation
Copyright © The Boeing Company. See title page for details.
D6-30151-425 11.31.17
Manually Entered Latitude or Longitude Reporting PointWaypoints
Latitude or longitude reporting waypoints are entered as the latitude or longitude
followed by a dash, then the increment chosen for the following waypoints.
Example:
• W060–10 adds waypoints starting at W060 in ten degree increments from
that point to the destination
• the entry must be made on a LEGS page on any line before the first
reporting point
• usually, this entry is made on the active waypoint line and proper
sequencing is performed by the FMC
Manually Entered Along–Track Waypoints
Along–track waypoints are created on the active route and do not cause route
discontinuities where they are created.
Along–track waypoints are created using the waypoint name (the place), followed
by a slash and minus sign, for points before the waypoint, or no sign for points
after the waypoint, followed by the mileage offset for the newly defined waypoint.
The created waypoint is then inserted over the original waypoint. The distance
offset must be less than the distance between the originating waypoint and next
(positive value) or preceding (negative value) waypoint. Latitude and longitude
waypoints cannot be used to create along–track waypoints. Examples:
• VAMPS/25 is 25 miles after VAMPS on the present route, and displays as
VAM01
• ELN/-30 is 30 miles before ELN on the present route, and displays as
ELN01
ND Map Displays
The route displays on the ND in map, map center, 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 NDmap
data displays relative to this apex.
April 01, 2001
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
11.31.18 D6-30151-425
Flight Management, Navigation -
Flight Management System
Operation
When adequate radio (or GPS) 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
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.
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.
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 display in large font. FMC predicted
values do not act as constraints, and display in small font.
April 01, 2001
747 Operations Manual
Flight Management, Navigation -
Flight Management System
Operation
Copyright © The Boeing Company. See title page for details.
D6-30151-425 11.31.19
Takeoff and Climb
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