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.
11.31.4 D615Z003-TBC
Terminology
The following paragraphs describe FMC and CDU terminology.
Active – flight plan data used to calculate LNAV or VNAV guidance commands.
Activate – changing a route from inactive to active for navigation by:
• selecting the ACTIVATE prompt
• pushing the execute (EXEC) key
Altitude constraint – a crossing restriction at a waypoint.
Delete – using the DELETE key removes FMC data and reverts to default values,
dash or box prompts, or a blank entry.
Econ – a speed schedule calculated to minimize operating cost. The economy
speed is based on the cost index. A low cost index causes a lower cruise speed.
Maximum range cruise or the minimum fuel speed schedule may be obtained by
entering a cost index of zero. This speed schedule ignores the cost of time. A
minimum time speed schedule may be obtained by entering a cost index of 9999.
This speed schedule calls for maximum flight envelope speeds. A low cost index
may be used when fuel costs are high compared to operating costs.
Enter – putting data in the CDU scratchpad and line selecting the data to the
applicable location. New characters can be typed or existing data can be line
selected to the scratchpad for entry.
Erase – removing entered data, which has resulted in a modification, by selecting
the ERASE prompt.
EICAS Message – refers to a non-normal message displayed on the EICAS.
Execute – pushing the illuminated EXEC key to make modified data active.
Inactive – data not being used to calculate LNAV or VNAV commands.
Help Window – a small window on the CDU display that shows FMC messages
and information.
Initialize – entering data required to make the system operational.
Message – FMC information displayed in the CDU help window.
Modify – changing active data. When a modification is made to the active route
or performance mode, MOD displays in the page title, ERASE displays next to
line select key 6 left, and the execute key illuminates.
Prompt – CDU symbols 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 data.
Purge – select the PURGE prompt to remove all airports uplinked to the ALTN
LIST.
June 16, 2008
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