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 11.31.3
(SB Changes YK981 - YQ456)
Activate – designating an entered route as the active route for navigation. It is a
two step process:
• push the ACTIVATE prompt
• push the execute (EXEC) key.
YW273, YW274
(SB Changes YK981 - YQ456)
Activate – changing an inactive route to an active route for navigation is a two step
process:
• push the ACTIVATE prompt
• push the execute (EXEC) key.
Altitude restriction – a crossing restriction at a waypoint.
Delete – remove FMC data and revert to default values, dash or box prompts, or a
blank entry using the DELETE key.
Econ – a speed schedule calculated to minimize operating cost. The economy
speed is based on the flight crew CDU–entered cost index. A low cost index
reflects high fuel costs and results in a lower cruise speed.
Enter – placing an entry into the CDU scratchpad and then line selecting the
information to the desired location. New characters can be typed, or existing data
can be line selected into the scratchpad.
Erase – removing flight crew–entered information, which has resulted in a
modification, by pushing the ERASE prompt.
Execute – making modified information part of the active flight plan by pushing
the EXEC key.
Inactive – route, climb, cruise, or descent information not currently being used to
calculate LNAV or VNAV commands.
Initialize – entering information required to make the system operational.
Message – information the FMC automatically writes in the scratchpad to inform
the flight crew of a system condition.
Modify – active data that is changed but not yet executed. When a modification is
made to the active route or performance mode, MOD is displayed in the page title,
ERASE appears next to line select key 6 left, and the execute key illuminates.
Prompt – CDU displays that aid the flight crew in accomplishing a task. Prompts
can be boxes, dashes, or a careted (< or >) line to remind the flight crew to enter
or validate information.
Select – pushing a key to obtain the desired information or action, or to copy
selected data to the scratchpad.
September 15, 2016
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