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Weather Radar
The weather radar system consists of a receiver/transmitter unit and antenna.
Control is managed through the TCP. Radar returns display on the ND in MAP
mode only.
The EFIS control panel weather radar (WXR) map switch controls power to the
transmitter/receiver. Weather radar is displayed on the ND when the WXR
checkbox is checked on the ND pull down MENU. The radar display range
automatically adjusts to the ND range selected on the EFIS control panel. At ND
ranges greater than 320 nm, WXR can still be displayed but will only show
weather returns out to 320 nm.
The weather radar system performs various levels of self test on power up, during
each sweep, and when descending through 2,300 feet AGL.
Turbulence can be sensed by the weather radar only when there is sufficient
precipitation. Clear air turbulence can not be sensed by radar.
The weather radar also provides predictive windshear alerting. Refer to Chapter
15, Section 10, Predictive Windshear (PWS) Display and Annunciations, for
additional information.
787 Flight Crew Operations Manual
Flight Management, Navigation -
Navigation Systems Description
11.20.14 Boeing Proprietary
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787 Flight Crew Operations Manual
Flight Management, Navigation Chapter 11
Flight Management System Description Section 30
Boeing Proprietary 11.30.1
11.30 Flight Management, Navigation-Flight 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 Chapter
11, Section 32, FMC Failures, 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 pull down MENU is used to select the
items displayed on the ND. The MCP 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.
787 Flight Crew Operations Manual
Flight Management, Navigation -
Flight Management System
Description
11.30.2 Boeing Proprietary
The FMC is certified for area navigation when used with navigation radio and/or
GPS updating. The FMC and CDU are used for enroute and terminal area
navigation, RNAV approaches, and to supplement primary navigation during all
types of instrument approaches.
Control Display Units (CDUs)
The flight crew controls the FMC using emulated CDU displays. The CDUs may
be displayed on any of the MFDs as selected by the aircrew.
Refer to Chapter 10, Flight Instruments, Displays for a description of alternate
display control. Refer to Chapter 5, Communications, for a description of
communications control.
787 Flight Crew Operations Manual
Flight Management, Navigation Chapter 11
Flight Management System Operation Section 31
Boeing Proprietary 11.31.1
11.31 Flight Management, Navigation-Flight Management System Operation Introduction
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