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active and terminates at the start of approach phase.
Approach
Approach phase starts when the first waypoint of the procedure sequences or when
the runway is the active waypoint and the distance to go is less than 25 nm.
Flight Complete
Thirty seconds after engine shutdown, flight complete phase clears the active
flight plan and load data. Some preflight data fields initialize to default values in
preparation for the next flight.
Operational Notes
When operating in LNAV and VNAV modes, observe system operation for
unwanted pitch, roll, or thrust commands. If unwanted operation is observed,
select heading select and flight level change modes.
The system must be carefully observed for errors following:
• activation of a new data base
• power interruption
• IRUfailure
December 01, 1999
747 Operations Manual
Flight Management, Navigation -
Flight Management System
Operation
Copyright © The Boeing Company. See title page for details.
D6-30151-425 11.31.3
When operating more than 21 nm off the active route, the FMC does not sequence
the active waypoint when the airplane passes the waypoint. LNAV can only
capture the active leg. It cannot capture an inactive leg in the active route. The
DIRECT TO or INTERCEPT COURSE TO procedures can be used to create an
active leg for capture.
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 procedures can be used to start waypoint sequencing beyond the vectors leg.
When entering airways on a route page, the start and end waypoints must be in the
data base. Otherwise, the 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 ACTIVATE prompt
• pushing execute (EXEC) key
Altitude constraint – a crossing restriction at a waypoint.
Delete – using DELETE key removes FMC data and reverts to default values, dash
or box prompts, or a blank entry.
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
11.31.4 D6-30151-425
Flight Management, Navigation -
Flight Management System
Operation
Econ – a speed schedule calculated to minimize operating cost. 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 scratchpad.
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
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