737 MAX Flight Crew Operations Manual
Flight Management, Navigation -
Flight Management System
Operation
11.31.12
MN-FLT-OH-201
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.
Long Waypoint Names
Names with more than five characters are abbreviated using the following rules
sequentially until five characters remain. Double letters are deleted. Examples:
• KIMMEL becomes KIMEL
• COTTON becomes COTON
• RABBITT becomes RABIT.
Keep the first letter, first vowel and last letter. Delete other vowels starting from
right to left. Examples:
• ADOLPH becomes ADLPH
• BAILEY becomes BAILY
• BURWELL becomes BURWL.
Keep the last letter, then delete consonants from right to left. Examples:
• ANDREWS becomes ANDRS
• BRIDGEPORT becomes BRIDT
• HORSBA becomes HORSA.
March 1, 2021
