737 Flight Crew Operations Manual
Flight Management, Navigation -
FMC Preflight
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
D6-27370-866-EGP 11.40.9
Valid entries are ICAO four letter airport identifiers.
Displays the latitude and longitude of the reference airport.
Removes previous GATE entry.
Entry blanks at lift–off.
2 GATE
The gate entry allows further refinement of the latitude/longitude position.
Optional entry after the reference airport is entered.
Valid entry is a gate number at the reference airport.
Displays the latitude and longitude of the reference airport gate from the
navigation database.
Changes to dashes when a new reference airport is entered.
Entry blanks at lift–off.
3 GMT – Month/Day (GMT – MON/DY)
Displays GPS time and date. If the GPS time is not valid, GMT starts at 0000.0Z
when the FMC is first powered. MON/DY is blank. Manually enter the correct
GMT.
4 INDEX
Push – displays the INIT/REF INDEX page.
5 Last Position (LAST POS)
Displays the last FMC computed position.
6 Set IRS Position (SET IRS POS)
The set inertial position entry is required to initialize the IRS. Select the most
accurate latitude/longitude for the initialization. A displayed latitude/longitude
can be selected or a manual entry can be used.
If an entry is not made before the IRS finishes the initial alignment, the scratchpad
message ENTER IRS POS is displayed.
Failure of the manually entered position to pass the IRS internal check displays
the scratchpad message ENTER IRS POS.
Enter airplane position latitude and longitude.
Box prompts are displayed when either IRS is in the ALIGN mode and IRS
present position has not been entered.
Blanks when the IRS transitions from the alignment to the navigation mode.
September 26, 2013
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