Flight Management, Navigation -FMC Preflight
737 Operations Manual
Database activation is accomplished by pushing the proper date range prompt to copy that date into the scratchpad. The scratchpad date may then be transferred to the ACTIVE database line. The previous active date moves down to the inactive date line.
The ACTIVE label appears above the active navigation database date. No label appears above the inactive navigation database date. The navigation database date can be changed only on the ground. Changing the navigation database removes all previously entered route data.
When an active database expires in flight, the expired database continues to be used until the active date is changed after landing.

Inactive Date Range
Displays the effectivity date range for the inactive navigation database.

Supplemental Data (SUPP DATA)
Displays the effective date of the supplemental database. Blank if supplemental database is empty

Position Initialization (POS INIT)
Push – displays the POS INIT page.
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Flight Management, Navigation -FMC Preflight 737 Operations Manual

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Flight Management, Navigation -FMC Preflight 737 Operations Manual
Position Pages Position Initialization Page
The POS INIT page allows airplane present position entry for IRS alignment and FMC initialization. The same page is used to enter/update the magnetic heading for an IRS which is in the ATT mode. There are (U3) two or (U4 and on) three POS pages.
Flight Management, Navigation -FMC Preflight 737 Operations Manual

Reference Airport (REF AIRPORT)
The reference airport entry allows entry of the current airport for display of the
airport latitude/longitude.
Optional entry.

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Flight Management, Navigation -FMC Preflight 737 Operations Manual
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.

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.

Greenwich Mean Time Month/Day (GMT – MON/DY)
Displays the time and date from the captain’s clock.
If the captain’s clock is not valid, GMT starts at 0000.0Z when the FMC is first
powered. MON/DY is blank. Manually enter the correct GMT.

INDEX
Push – displays the INIT/REF INDEX page.

Last Position (LAST POS)
Displays the last FMC computed position.

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.
If the latitude/longitude position is not within 4 NM of the origin airport, the
scratchpad message VERIFY POSITION is displayed.

Flight Management, Navigation -FMC Preflight 737 Operations Manual

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.

Set IRS Heading (SET IRS HDG)
Enter/update magnetic heading for any IRS which is in ATT mode. Line blanks when IRS not in ATT mode.

ROUTE
Push – displays the ROUTE page.
Position Reference Page
The POS REF page displays the airplane positions as calculated by the FMC, IRS, and (U4 and on) radio navigation receivers.
This page displays latitude/longitude. All position displays are in actual latitude and longitude, as calculated by the respective system. Ground speed is displayed for the FMC and each IRS.
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