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7 Inactive Date Range
8 SUPP DATA
9 DRAG/FF
10 Position Initialization (POS INIT)
787 Flight Crew Operations Manual
Flight Management, Navigation -
FMC Preflight
11.40.8 Boeing Proprietary
Entry of the reference airport displays the airport latitude/longitude.
Optional entry.
Valid entries are ICAO four letter airport identifiers.
Removes previous GATE entry.
Entry blanks at lift–off.
1 Reference Airport (REF AIRPORT)
W8MT-34-00-0029
------------------------------- - - - - - --
------------------------------- - - - - - - -
-
1
<
G
S E T H D G
--o
UT C P S P OS
N47 32.5 W122 18.7
INDEX ROUTE>
530Z
INIT/REF INDEX
ON GROUND - INTERTIAL POSITION NOT ENTERED
<POS
POS INIT 1/4
INDEX ROUTE>
N47o32.5W122o18.7
L A S T P O S
R E F A I R P O R T
G A T E
UT C GP S P O S
SE T I N E R T I A L P OS
N47 32.5 W122 18.7
-
--- --.- ---- --.-
530Z
--
1
<
-
INIT
REF
o o
o o
o o
1
2
3
4
9
5
6
8
7
787 Flight Crew Operations Manual
Flight Management, Navigation -
FMC Preflight
Boeing Proprietary 11.40.9
The gate entry allows further refinement of the latitude/longitude position.
Optional entry after reference airport entered.
Valid entry is a gate number at the reference airport.
Displays the latitude and longitude of the reference airport gate.
Changes to dashes when a new reference airport entered.
Entry blanks at lift–off.
• displays time from captain’s clock when operative; otherwise, displays
time from first officer’s clock
• hours set by entering desired hour reference
• minutes set by resetting appropriate pilot’s clock
Displays UTC time as updated from the GPS.
Push – displays the INIT/REF INDEX page.
Displays the last FMC calculated position.
Displays the GPS present position. During preflight, the GPS POS may not
display due to satellite availability, performance, or unfavorable geometry.
The set inertial position entry is optional because the IRS has continuous access
to the GPS position. Entry may be accomplished by selecting the most accurate
latitude/longitude from LAST POS, REF AIRPORT, GATE, GPS POS, or make a
manual entry.
If an entered position fails the IRU internal check, the CDU help window message
ENTER INERTIAL POSITION displays. If the entered position fails the IRU
check after the position is entered a second time, the CDU help window message
ALIGNMENT REINITIATED displays.
The entered position is also compared with the FMC origin airport position. If the
entered position is not within 6 nm of the FMC origin airport position, the
scratchpad message INERTIAL/ORIGIN DISAGREE displays.
Dashes display when any IRU or AHRU is in the alignment mode and can receive
a new position update. Enter the most accurate inertial position to remove any
accumulated IRU position errors.
Enter airplane position latitude and longitude.
2 GATE
3 Coordinated Universal Time (UTC)
4 INDEX
5 Last Position (LAST POS)
6 GPS Position (GPS POS)
7 Set Inertial Position (SET INERTIAL POS)
787 Flight Crew Operations Manual
Flight Management, Navigation -
FMC Preflight
11.40.10 Boeing Proprietary
When box prompts are displayed, present position entry is required. Box prompts
are displayed if GPS position is not available, and any IRU or AHRU is requesting
position.
Blanks when both IRUs and both AHRUs have completed alignment and enter the
navigation mode.
Blanks when the airplane is moving or has not been stationary for six to fifteen
consecutive minutes.
New inertial position entries can be made anytime dashes are displayed. New
entries display for 2 seconds. After 2 seconds, dashes display to allow entry of
another position.
Push – displays the ROUTE page.
Dashes display in flight when any IRU or AHRU is in reversionary attitude mode.
Entry of magnetic heading is displayed in the primary flight displays only after all
IRUs and AHRUs have failed.
Valid entry is 0 to 360 (0 or 360 displays as 000°). Entered heading displays in
large font for 2 seconds then is followed by dashes to allow entry of another
heading.
Position Reference Page 2/4
Position reference page 2 displays positions calculated by the FMC, IRU, GPS,
and radio navigation receivers. The FMC position can be updated to IRU, GPS, or
radio position on this page.
This page displays latitude/longitude or bearing/distance. All position displays are
　
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