787 Flight Crew Operations Manual
DO NOT USE FOR FLIGHT
Flight Management, Navigation Chapter 11
Flight Management System Description Section 30
Copyright © The Boeing Company. See title page for details.
D615Z003-TBC 11.30.1
11.30 Flight Management, Navigation-Flight Management System Description
Flight Management, Navigation30 Flight Management System DescriptionFlight Management System Description
Introduction
The flight management system (FMS) aids the flight crew with navigation,
in–flight performance optimization, automatic fuel monitoring, and flight deck
displays. Automatic flight functions manage the airplane lateral flight path
(LNAV) and vertical flight path (VNAV). The displays include a map for airplane
orientation and command markers on the airspeed, altitude, and thrust indicators
to help in flying efficient profiles.
The flight crew enters the applicable route and flight data into the CDUs. The
FMS then uses the navigation database, airplane position, and supporting systems
data to calculate commands for manual and automatic flight path control.
The FMS tunes the navigation radios and sets courses. The FMS navigation
database supplies the necessary data to fly routes, SIDs, STARs, holding patterns,
and procedure turns. Cruise altitudes and crossing altitude restrictions are used to
calculate VNAV commands. Lateral offsets from the programmed route can be
calculated and commanded.
Flight Management Computer (FMC)
The basis of the flight management system is the flight management computer
function. Since the term FMC is universally understood, it is used here for
standardization and simplification.
There are three independent FMCs. At power up, one FMC is designated to
accomplish the flight management tasks while the other FMCs monitor. The
second FMC is ready to replace the first FMC if system faults occur. When the
second FMC becomes active, the third FMC becomes its backup. (Refer to FMC
Failure in Chapter 11, Section 32, for additional information.)
The FMC uses flight crew entered flight plan data, airplane systems data, and data
from the FMC navigation database to calculate airplane present position and pitch,
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 ND drop-down menu is used to select the items
displayed on the ND. The MCP selects the autothrottle, autopilot, and flight
director operating modes.
For additional information, refer to:
• Autopilot Flight Director System Controls
, Ch. 4, Sec. 10
• Map Keys and Information Selections
, Ch. 10, Sec. 10
February 15, 2010
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