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The HOLD AT waypoint becomes a termination identifier which is not part of the
existing route. The resulting route discontinuity is identified by box prompts,
requiring entries to define the route after PLUSS.

Copyright . The Boeing Company. See title page for details.
11.43.48  June 1, 2005

737 Flight Crew 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.
YA613, YA626, YA801 - YA809, YC411 - YD655

.  
FMC data link messages (alerting and advisory)

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.
Copyright . The Boeing Company. See title page for details.
Flight Management, Navigation -FMC Messages 737 Flight Crew 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 
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. 
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. 
CUTBACK DISARMED  U10.6 and later: Cutback turned off as a result of changing or deleting the flight plan runway while on the ground.  Clear the message. Re-arm as required. 
CUTBACK UNAVAILABLE  U10.3 and later: The FMC is unable to compute a Cutback N1 value.  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.” 

Copyright . The Boeing Company. See title page for details.
11.60.2   September 27, 2004

Flight Management, Navigation -FMC Messages 737 Flight Crew Operations Manual
ALERTING MESSAGE  CAUSE  CORRECTIVE ACTION 
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. 
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 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 as installed)  Clear message and set FMC source select switch to NORMAL. 
END OF OFFSET  Two minutes prior to passing offset leg termination.  Confirm 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. 
　
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