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be changed on the ground. Changing the navigation database removes all
previously entered route data.
When an active database expires in flight, the expired database is used until the
active date is changed after landing.
Note: The navigation database extending into calendar year 2000 will display as
follows: “DECXX/JANXX111”. The “/” and year are replaced with “111”.
This will display on all navigation databases thereafter. However,
installation of FMC software load 14 displays the usual format; that is,
“DECXX/JANXX/00”.
8 Inactive Date Range
Displays the effectivity date range for the inactive navigation database.
9 Company (CO) DATA
Displays airline policy file identifier.
10 Position Initialization (POS INIT)
Push – displays POS INIT page.
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
11.40.8 D6-30151-425
Flight Management, Navigation -
FMC Preflight
Position Initialization Page 1/3
Position initialization page allows entry of airplane present position for IRU
alignment. The same page is used to enter the heading for IRUs in attitude mode.
1 Reference (REF) AIRPORT
Entry of the reference airport displays airport latitude/longitude.
Valid entries are ICAO four letter airport identifiers.
Entry blanks at lift–off.
LEAST 1
WITH AT
OR IN AIR
ON GROUND
IRU IN ATT
<POS
INIT/REF INDEX
ENTERED
POS NOT
SET IRS
GROUND,
ON
REF
INIT
POS INIT>
IDENT
4
< I N D E X R OU T E >
G A T E
R E F A I R P O R T
L A S T P O S
- - - - - - - - - - - - - - - - - - - - - - - -
- - - -
P O S I N I T 1 / 3
1 4 3 2
U T C
H D G
- - - ` ` . ` .
S P OS
G P S P O S
SE T S E TIR
zN 4 ` 3 . W .
N 4 ` 3 W .
( G P S )
7 2.4
7 2 122`1 8 7
122 `1 8 7
1
2
3
4
5
6
7
8
9
October 1, 2000
747 Operations Manual
Flight Management, Navigation -
FMC Preflight
Copyright © The Boeing Company. See title page for details.
D6-30151-425 11.40.9
2 GATE
Gate entry allows further refinement of the latitude/longitude position.
Valid entry is a gate number at the reference airport.
Displays latitude and longitude of the reference airport gate.
Changes to dashes when a new reference airport entered.
Entry blanks at lift–off.
3 UTC
UTC (GPS) - displays time from a GPS sensor.
UTC (MAN) -
• displays time from Captain’s clock when operative; otherwise, displays
time from F/O’s clock
• time set by resetting appropriate pilot’s clock
4 SET Heading (HDG)
Dashes display if an IRU is in attitude mode.
Entering heading updates IRS magnetic heading signal for all IRUs in attitude
mode.
Valid entry is 0 to 360 (0 or 360 is shown as 360°). Dashes display two seconds
after entry to allow another entry.
5 INDEX
Push – displays INIT/REF INDEX page.
6 LAST Position (POS)
Displays the last FMC calculated position.
7 GPS Position (POS)
Displays GPS position. During preflight, GPS POS may not display due to
satellite availability, performance, or unfavorable geometry.
8 SET IRS Position (POS)
IRS position entry is required to initialize the IRUs.
Enter airplane position latitude and longitude. Select the most accurate
latitude/longitude from LAST POS, REF AIRPORT, GATE, GPS POS, or make a
manual entry.
October 1, 2000
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
11.40.10 D6-30151-425
Flight Management, Navigation -
FMC Preflight
If an entry is not made before the IRUs finish initial alignment, the scratchpad
message ENTER IRS POSITION displays. If an entry has been made and the
message displays, check the accuracy of the entered position for each IRU on the
POS REF page and enter again even if positions are correct.
Boxes display when any IRU in align mode and present position not entered.
Blank except when an IRU in align mode.
9 ROUTE
Push – displays the ROUTE page.
Preflight Pages – Part 1B
Route Page 1/X
Two routes (RTE 1 and RTE 2) can be displayed in air traffic control format.
Routes can be entered by the flight crew or uplinked through data link. All routes
have two or more pages. The first route page displays origin and destination data.
Subsequent route pages display the route segments between waypoints or fixes.
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