Crossload
Functions the same as on IRS LEGS page.

IRS Legs
Allows selection of the IRS LEGS page.

IRS Progress
Allows selection of the IRS PROGRESS page.
Copyright . The Boeing Company. See title page for details.
December 1, 2000  11.50.11
Flight Management, Navigation -Alternate Navigation System (ANS) 737 Operations Manual

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Copyright . The Boeing Company. See title page for details.
11.50.12  December 1, 2000

737 Operations Manual

Introduction
FMC messages tell the flight crew when system operation is degraded or if there
are data input errors.
FMC messages show in the CDU scratchpad. The messages are categorized as:

.
alerting messages

.
entry error messages

.
advisory messages.

. ANCDU advisory messages The FMC messages are shown according to their level of importance. Alerting messages are most important, followed by entry error messages. Advisory messages are least important. If multiple messages exist, a less important message replaces another message in the scratchpad when the CLR key is pushed or the condition is corrected.
The amber FMC alert light on each pilot’s instrument panel illuminates when there is an FMC alerting message. All FMC messages illuminate the CDU message (MSG) light. Clear the message or correct the condition to cancel the message.
The following tables are general lists; some messages may not apply to all FMC configurations.
Flight Management, Navigation -FMC/CDU Messages 737 Operations Manual

FMC Alerting Messages
These messages relate to operationally significant conditions which affect FMC operation.
FMC alerting messages:
.  
are shown in the CDU scratchpad

.  
cause the amber FMC alert light on each pilot’s instrument panel to
illuminate

.  
illuminate message lights (MSG) on both CDUs.

Use the CLR key or correct the condition responsible for the message to remove the message. The message is temporarily removed from the scratchpad when manually entering data. The message returns when the data is removed from the scratchpad.
ALERTING MESSAGE  CAUSE  CORRECTIVE ACTION 
CHECK FLIGHT PLAN  The FMC has found and corrected an error in the nav database.  Check the flight plan and correct if necessary. 
CHECK ALT TGT  U10.5 and later: VNAV disengages while airplane is between MCP and FMC altitudes or VNAV button pressed while airplane is between MCP and FMC altitudes.  Clear the message. 
CRZ ALT CHANGED TO XXXXX  U10.4 and later: During a missed approach a STAR or approach has been selected that conflicts with the cruise altitude.  Clear the message. 
CYCLE IRS OFF–NAV  IRS is unable to complete alignment under current conditions.  Cycle IRS mode selector to “OFF” and back to “NAV”. 
DATA BASE INVALID  The automatic validity test of the permanent navigation database has failed.  Advise maintenance personnel to check the FMC and reload the database, as required. If desired, consider the use of the temporary nav database. 

Copyright . The Boeing Company. See title page for details.
11.60.2   December 6, 2002

Flight Management, Navigation -FMC/CDU Messages 737 Operations Manual
ALERTING MESSAGE  CAUSE  CORRECTIVE ACTION 
DISCO INSRTD AFTR XXXXX (waypoint identifier)  A ROUTE DISCONTINUITY has been inserted into the flight plan due to undefined termination of a downpath leg or a double or triple waypoint BYPASS.  Select the RTE or RTE LEGS pages and modify the waypoints for a continuous route. 
DISCONTINUITY  Passing the last waypoint in the route prior to a ROUTE DISCONTINUITY (LNAV disengages) or pressing LNAV while in a discontinuity.  Select the RTE LEGS page. Enter the desired active waypoint into the box prompts. Correct any ROUTE DISCONTINUITY and EXECute. Reengage LNAV. 
DUAL FMC OP RESTORED  Dual FMC operation has been successfully restored. (Dual FMC Installed)  Clear message and set FMC source select switch to NORMAL. 
END OF OFFSET  Two minutes prior to passing offset leg termination.  Confirm ATC clearance. 
END OF ROUTE  LNAV engaged and passing the last waypoint in the route (LNAV disengages).  Select the RTE LEGS page. Enter the desired active waypoint into the dash prompts and EXECute. Reengage LNAV. 
ENG OUT SID MOD  U10.3 and later: An engine-out SID has been automatically inserted into the flight plan as a modification.  Clear the message. 
ENTER IRS POSITION  IRS in the alignment mode needs present position to complete alignment. Previous present position entry was not received back from the IRS.  Enter IRS present position into the scratch pad and line select 4R on the POS INIT page of the CDU. If present position was previously entered, overwrite displayed data. If necessary, enter present position directly into the IRS control /display unit. 
　
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