737 Flight Crew Operations Manual
Flight Management, Navigation -
Flight Management System
Operation
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
D6-27370-866-EGP 11.31.11
YW273, YW274
(SB Changes YK981 - YQ456)
LNAV provides steering commands to the next waypoint. If selected, LNAV
engages when laterally within 3 nautical miles of the active route leg. If outside of
3 nautical miles of the active route leg, LNAV engages if on an intercept heading
of 90 degrees or less and the intercept will occur before the active waypoint. FMC
LNAV guidance normally provides geodetic paths between waypoints. However,
when an arrival or approach from the FMC database is entered into the active
route, the FMC can supply commands to fly a constant heading, track, or follow
an arc, as required by the procedure.
Waypoints
Waypoint (navigation fix) identifiers are displayed on the CDU and navigation
display.
The CDU message NOT IN DATA BASE is displayed if a manually entered
waypoint identifier is not stored 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 Waypoint Names
VHF – waypoints located at VHF navaids (VOR/DME/LOC) are identified by the
official one, two, three or four character facility identifier. Examples:
• Los Angeles VORTAC – LAX
• Tyndall TACAN – PAM
• Riga, Latvia – RIX.
NDB – waypoints located at NDBs are identified by use of the station identifier.
Example:
• Fort Nelson, CAN – YE.
Fix Waypoint Names
Fixes with one–word names – waypoints located at fixes with names containing
five or fewer characters are identified by the name. Examples:
• DOT
• ACRA
•ALPHA.
September 15, 2016
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