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.
11.31.12 D615Z003-TBC
Lateral Navigation (LNAV)
LNAV provides steering commands to the next waypoint or the selected route
intercept point. When armed on takeoff, LNAV engages at or above 50 feet, when
laterally within 2.5 nautical miles of the active route leg. FMC LNAV guidance
normally provides great circle courses between waypoints. However, when an
arrival or approach from the FMC database is entered into the active route, the
FMC commands a heading, track, or a DME arc to comply with the procedure.
Waypoints
Waypoint (navigation fix) identifiers display on the CDU and navigation display.
The CDU message NOT IN DATABASE displays if a manually entered waypoint
identifier is not kept in the database. The waypoint can still be entered as a
latitude/longitude, place–bearing/distance or place–bearing/place–bearing
waypoint.
FMC–generated waypoints contain a maximum of five characters assigned
according to the following rules:
Navaid Waypoints
VHF – waypoints located at VHF navaids (VOR/DME/LOC) are identified by
one, two, three or four character facility identifier. Examples:
• Los Angeles VORTAC – LAX
• Tyndall TACAN – PAM
• Riga Engure, USSR – AN
NDB – waypoints located at NDBs are identified by use of the station identifier.
Example: FORT NELSON, CAN – YE
Fix Waypoints
Waypoints located at fixes with names containing five or fewer characters are
identified by the name. Examples:
• DOT
• ACRA
•ALPHA
Long Waypoints
Waypoints with more than five characters are abbreviated using the following
rules sequentially until five characters remain. For double letters, one letter is
deleted. Example:
• KIMMEL becomes KIMEL
October 31, 2007
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