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roll, and thrust commands necessary to fly an optimum flight profile. The FMC
sends these commands to the autothrottle, autopilot, and flight director. Map and
route data are sent to the NDs. The EFIS control panels select the necessary data
for the ND. The mode control panel selects the autothrottle, autopilot, and flight
director operating modes. Refer to the following chapters for operation of these
other systems:
• Chapter 4, Automatic Flight
• Chapter 10, Flight Instruments, Displays
The FMC is certified for area navigation when used with navigation radio and/or
GPS updating. The FMC and CDU are used for en route and terminal area
navigation, RNAV approaches, and to supplement primary navigation means
when conducting other types of nonprecision approaches.
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
11.30.2 D6-30151-425
Flight Management, Navigation -
Flight Management System
Description
Two IRUs in conjunction with one FMC and two FMS-CDUs meet the
requirements as the sole means of navigation for flights up to 18 hours duration.
Control Display Units (CDUs)
The flight crew controls the FMC using three CDUs. The CDUs give alternate
display and navigation capability if both FMCs fail (refer to the Alternate
Navigation section of this chapter). Refer to Chapter 10, Flight Instruments,
Displays for a description of alternate display control.
April 01, 2001
747 Operations Manual
Flight Management, Navigation Chapter 11
Flight Management System Operation Section 31
Copyright © The Boeing Company. See title page for details.
D6-30151-425 11.31.1
Introduction
When first powered, the FMS is in preflight phase. When completing a phase, the
FMS changes to the next phase in this order:
Preflight
During preflight, the flight crew enters flight plan and load sheet data into the
CDU. The flight plan defines the route of flight from the origin to the destination
and initializes LNAV. Flight plan and load sheet data provide performance data to
initialize VNAV.
Some ATC information can be entered into the CDU by data link.
Some company information can be entered into the CDU by data link.
Required preflight data consists of:
Optional preflight data includes:
Preflight starts with the IDENT page. If the IDENT page is not displayed, it can
be selected with the IDENT prompt on the INIT/REF INDEX page. Visual
prompts help the flight crew select CDU preflight pages. Preflight pages can be
manually selected in any order.
After the data on each preflight page is entered and checked, pushing the lower
right line select key selects the next preflight page. After selecting ACTIVATE on
the ROUTE page, the execute (EXEC) light illuminates. Pushing the EXEC key
activates the route.
The departure/arrival (DEP/ARR) page can be used to select a SID. Selection of
the SID may cause a route discontinuity. Resolution of the discontinuity and
execution of the modification should be accomplished on the ROUTE or LEGS
page.
• preflight
• takeoff
• climb
• cruise
• descent
• approach
• flight complete
• initial position
• route of flight
• performance data
• takeoff data
• navigation database selection
• route 2
• alternate airport
• standard instrument departure
(SID)
• standard terminal arrival route
(STAR)
• thrust limits
• wind
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
11.31.2 D6-30151-425
Flight Management, Navigation -
Flight Management System
Operation
When all required preflight entries are complete, the PRE–FLT line title on the
TAKEOFF REF page is replaced by dashes and the THRUST LIM prompt
displays at the next page select line location.
Takeoff
Takeoff phase starts with selection of TO/GA and terminates with thrust reduction
for climb. LNAV and VNAV can be armed before takeoff to activate at the
applicable altitude (refer to Chapter 4, Automatic Flight).
Climb
Climb phase starts at thrust reduction for climb and terminates at the top of climb
(T/C) point. The T/C point is where the airplane reaches the cruise altitude entered
on the PERF INIT page.
Cruise
Cruise phase starts at the T/C point and terminates at top of descent (T/D) point.
Cruise can include step climbs and en route descents.
Descent
Descent phase starts at the T/D point or when the VNAV descent page becomes
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