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in actual latitude and longitude, as calculated by the related system. The IRU,
GPS, and radio position data can be changed to bearing/distance.
8 ROUTE
9 SET HDG
787 Flight Crew Operations Manual
Flight Management, Navigation -
FMC Preflight
Boeing Proprietary 11.40.11
The source used by the Master FMC for position data displays next to the FMC
line title. In the example, the FMC uses GPS-IRU for position data.
Displays the FMC calculated latitude/longitude.
Identifies the source for calculating the FMC position:
• GPS – position calculated from GPS position data
• GPS-IRU – position calculated from GPS and IRU position data
• GPS-AHRU – position calculated from GPS and AHRU position data
• INERTIAL – position calculated from IRU position data
• RADIO – position calculated from navigation radio position data
• LOC – position calculated from localizer and IRU position data
• LOC-GPS-IRU – position calculated from localizer, GPS and IRU
position data
• LOC-GPS-AHRU – position calculated from localizer, GPS and AHRU
position data
• LOC-RADIO – position calculated from localizer and navigation radio
position data.
1 FMC
--------------------------------------
0 3 4
POS REF 2 / 4
FM C ( G P S - I R U ) PO S U P D A T E
A C T U A L 4 0 0 N M
A C T U A L 4 0 0 N M
A C T U A L N M
R N P / A C T U A L D M E D M E
R A D I O L
G P S - I R U L
I R U L
0. 5 0 NM BFI BFI
.
.
.
BRG/DIST>
ARM>
/0.10
<INDEX
N47o32.5 W122o18.7
N47o32.5 W122o18.7
N47o32.5 W122o18.7
N47o32.5 W122o18.7
W8MT-34-00-0034
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11
3
INI 1
REF
POS
POS
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787 Flight Crew Operations Manual
Flight Management, Navigation -
FMC Preflight
11.40.12 Boeing Proprietary
Displays latitude/longitude (or bearing/distance) position of the IRU sensor
currently being used by the Master FMC.
Blank if no valid IRU position exists.
Displays latitude/longitude (or bearing/distance) position of the GPS sensor
currently being used by the Master FMC.
Blank if no valid GPS position exists.
After airborne, displays latitude/longitude (or bearing/distance) position of the
navigation radios being used by the Master FMC.
Blank if no valid RADIO position exists.
Displays RNP values stored in the navigation database for departure and arrival
procedures; or, if there are none, displays the default values stored within the FMC
by flight phase. Also displays FMC actual navigation performance (ACTUAL).
Default RNP is in small font.
Valid RNP entries are in the range 0.01 to 99.9. ACTUAL entry not allowed.
When ACTUAL exceeds RNP, the EICAS message NAV UNABLE RNP
displays.
Note: The FMC stops GPS updating if GPS data accuracy degrades due to
satellite availability or unfavorable geometry, or if the flight crew inputs a
small RNP value. Subsequently, the FMC receives updates from another
system.
Push – displays the INIT/REF INDEX page.
Push –
• arms FMC position update function
• changes prompt to ARMED
• adds NOW prompts to right side of INERTIAL, GPS, and RADIO lines
Push a NOW prompt key to update FMC position to the selected source.
Displays actual navigation performance of the IRU.
Displays actual navigation performance of the GPS.
2 INERTIAL
3 GPS
4 RADIO
5 Required Navigation Performance and Actual Navigation
6 INDEX
7 UPDATE ARM
8 ACTUAL – INERTIAL
9 ACTUAL – GPS
787 Flight Crew Operations Manual
Flight Management, Navigation -
FMC Preflight
Boeing Proprietary 11.40.13
Displays actual navigation performance of radio updating.
Displays radio station identifiers.
Position update mode is indicated in the line title:
• DME DME
• VOR DME
• LOC
Push – alternates position data format between bearing/distance or
latitude/longitude.
The page illustration is shown in the latitude/longitude display format.
Latitude/longitude format displays are actual position.
Bearing/distance format displays the bearing and distance of other position
sources relative to the Master FMC position.
Position Reference Page 3/4
On position reference page 3, the flight crew can observe the calculated positions
of the left, right and center FMCs. The header line indicates which FMC is being
　
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