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• the selected system is highlighted in large font green text
• the default selection is the left system.
Push -
• tests weather radar system operation without transmitting
• displays test pattern and PWS symbol at the end of the test and any fault
message on ND with WXR selected (except in PLAN mode).
1 Weather Radar System (WXR SYS)
2 Weather Radar Test (WXR TEST)
TUNING AND CONTROL PANEL
WXR TEST
ON OFF>
<L R
WEATHER RADAR 2/2
WXR SYS
NEXT
PAGE
1
2
787 Flight Crew Operations Manual
Flight Management, Navigation -
Controls and Indicators
11.10.22 Boeing Proprietary
• when on the ground, selecting WXR on the EFIS control panel and TEST
on the weather radar control panel activates a 12 second test. Initially, the
amber WINDSHEAR annunciation displays and the aural MONITOR
RADAR DISPLAY sounds. Next, the Master Warning Light illuminates
and the EICAS alert message WINDSHEAR SYS displays. Finally, the
red WINDSHEAR annunciation displays and the aural GO AROUND
WINDSHEAR AHEAD, and then WINDSHEAR AHEAD,
WINDSHEAR AHEAD sounds
• the test pattern and PWS symbol remain displayed until WXR is selected
off on the EFIS control panel, another mode is selected on the Mode
Selector, or an actual PWS alert is detected. The source of any faults
displays in the weather radar tilt field on the ND.
Note: Selecting the TEST mode to ON will deselect the weather radar display
mode (WX, WX+T, and MAP) on page 1/2.
787 Flight Crew Operations Manual
Flight Management, Navigation Chapter 11
Navigation Systems Description Section 20
Boeing Proprietary 11.20.1
11.20 Flight Management, Navigation-Navigation Systems Description Introduction
Navigation systems include global positioning system (GPS), air data reference
system (ADRS), inertial reference system (IRS), VOR, DME, ILS, ATC
transponder, weather radar, and the flight management system (FMS). The FMS
is described in the Flight Management System Description section of this chapter.
Navigation Systems Flight Instrument Displays
Refer to Chapter 10, Flight Instruments - Displays, for flight instrument display
system operations and typical instrument displays.
Global Positioning System (GPS)
Left and right GPS receivers are independent and supply very accurate position
data to the IRS. The IRS in turn supplies a very accurate hybrid GPS-inertial
position to the FMC. In the event that the IRS becomes inoperative, the GPS
supplies position and track data directly to the FMC. All GPS tuning is automatic.
GPS Displays
POS REF page 4/4 displays the left and right GPS-IRU position. The ND
annunciates GPS when the FMC uses GPS position updates.
When POS (position) is selected on the ND pull down MENU, the ND map
displays raw GPS position as left and right GPS symbols. The GPS symbols are
identical and display as a single symbol when the GPS receivers calculate the
same position.
GPS Data
If the IRS becomes inoperative during flight, the EICAS displays the message
NAV INERTIAL SYS and the FMC uses only GPS data to navigate.
Use the GPS NAV prompt on the POS REF page to inhibit GPS navigation data.
The EICAS message GPS alerts the crew when data from both GPS systems are
unavailable or when both systems have failed.
GPS position updates are allowed for all United States National Airspace
approach operations. Outside of this region, GPS position updates are allowed
during approaches only if the FMC database and approach charts are referenced
to the WGS-84 reference datum. GPS updates should be inhibited for all other
approach operations, unless other appropriate procedures are used.
787 Flight Crew Operations Manual
Flight Management, Navigation -
Navigation Systems Description
11.20.2 Boeing Proprietary
GPS System Schematic
PRELIMINARY
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
U
0 3 4
0.10N M
.
2 / 4
PO S U P D A TE
ACT U A L 4.0 0 NM
ACT U A L . NM
ACT U A L 4.0 0 NM
D M E D M E
0.00
R N P / A C T U A L
R A D I O L
GP S-I R U L
I R U L
FM C ( G P S-I R )
POS REF
ARM>
BFI PAE
BRG/DIST>
N47o32 5 W122o18.7
N47o32.5 W122o18.7
N47o32.5 W122o18.7
N47o32.5 W122o18.7
/
<INDEX
W8MT-34-00-0017
STATUS
POSITION
UPDATE
FMS
MAP
GPS NAV PROMPT
3/4
POS REF
POSITIONS
SENSOR
FMC
NAV MODE
NM
15
12
9
6
106 A1234
　
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