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active route and not on an offset route. Return to the active route can be
accomplished using the DIRECT TO or INTERCEPT COURSE TO/FROM
procedures.
When a waypoint is in the route more than once, certain route modifications (such
as DIRECT TO and HOLD) use the first waypoint in the route.
Some SIDs or STARS contain a heading vectors leg. VECTORS waypoints
display on the ND as a magenta line without an end point leading away from the
airplane symbol. If LNAV is active, the DIRECT TO or INTERCEPT COURSE
TO/FROM procedures can be used to start waypoint sequencing beyond the
vectors leg.
When entering airways in a route page, the start and end waypoints must be in the
database. A route segment must be entered as a DIRECT leg.
If the engines remain operating between flights, entering a new cruise altitude
before the next flight recalculates the proper vertical profile.
If a climb to cruise altitude is necessary after completing a descent, a new cruise
altitude entry must be made. Cruise altitude can be entered on the CLB page.
DIRECT TO courses are segments of a great circle route. When entering a
DIRECT TO waypoint on the LEGS page, the course above the waypoint before
execution is the arrival course at the waypoint. However, after execution, the
course is the current course to fly to the waypoint. These courses may not be the
same.
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
787 Flight Crew Operations Manual
Flight Management, Navigation -
Flight Management System
Operation
11.31.4 Boeing Proprietary
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.
Execute – pushing the illuminated EXEC key to make modified data active.
Inactive – data not being used to calculate LNAV or VNAV commands.
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.
Select – pushing a key to obtain the necessary data or action, or to copy selected
data to the scratchpad.
Speed restriction – an airspeed limit associated with a specified altitude entered
by the flight crew.
Speed transition – an airspeed limit associated with a specified altitude entered by
the FMC.
Waypoint – a point on the route or in the navigation database. It can be a fixed
point such as a latitude and longitude, VOR or ADF station, or an airway
intersection. A conditional waypoint is not associated with a land reference; it is
based on a time or altitude requirement. An example of a conditional waypoint is
“when reaching 4,000 feet”.
787 Flight Crew Operations Manual
Flight Management, Navigation -
Flight Management System
Operation
Boeing Proprietary 11.31.5
Maintenance Index
The MAINTENANCE INDEX page prompts are used only on the ground.
Displays the AIRLINE POLICY page.
This is a maintenance function.
　
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