.
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.
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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.
Speed restriction – an airspeed limit associated with a specified altitude or
waypoint.
Waypoint – a point on the route. It can be a fixed point such as a latitude and
longitude, VOR or ADF station, airway intersection, or a non–fixed point such as
a conditional waypoint. A conditional waypoint is not necessarily associated with
a land reference; it reflects a time position, or altitude requirement. An example
of a conditional waypoint is “when reaching 1000 feet”.
Maintenance Index Page
The MAINT BITE INDEX page is available only on the ground and provides access to data for use by maintenance personnel.
Flight Management, Navigation -Flight Management System Operation 737 Operations Manual
INDEX
Displays the INIT/REF INDEX page.
Navigation Position
The FMC determines present position from the IRS and navigation radios. The FMC uses its calculated present position to generate lateral steering commands along the active leg to the active waypoint.
FMC Position Update
On the ground, the FMC calculates present position based on IRS data.
Copyright . The Boeing Company. See title page for details.
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On the ground prior to takeoff with FMC position update, the FMC position update to the takeoff runway threshold position can be done on the TAKEOFF REF page. On airplanes with TO/GA update, automatic FMC position update to the takeoff runway threshold position, displayed on the TAKEOFF REF page, occurs during takeoff when the TO/GA switch is pushed. In this case, when making an intersection takeoff, the intersection displacement distance from the runway threshold must be entered on the TAKEOFF REF page.
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