Copyright . The Boeing Company. See title page for details.
September 27, 2004  11.60.3
Flight Management, Navigation -FMC Messages 737 Flight Crew Operations Manual

ALERTING MESSAGE  CAUSE  CORRECTIVE ACTION 
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 scratchpad 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. 
FMC APP/TUNE  U10.5 and later: An  Confirm the tuned 
DISAGREE  approach that utilizes FMC generated glidepath is in the active flight plan but an approach navaid (ILS/GLS) has been tuned with G/S ON.  frequency and approach selected in the FMC are both consistent with the actual approach intended to be flown. Resolve tuning or approach selection inconsistency. Clear the message. 
FMC APP MODE  U10.5 and later: An  Select QNH as the landing 
UNAVAIL–QFE  approach that utilizes FMC generated glidepath is in the flight plan (active or inactive) but QFE is selected on the FMC.  altimeter reference on the APPROACH REF page. Clear the message. 
FMC DISAGREE  U10.6 and later: During approach or on the ground, monitored parameters required for dual FMC operation are in disagreement. (Dual FMC as installed)  Monitor FMCs closely. Both FMCs remain online. Limit approaches to single FMC only. If desired, revert to SINGLE FMC OPERATION in this section. 
INSUFFICIENT FUEL  A change in conditions or flight plan route causes predicted fuel at destination to be 900 kilograms/2000 lbs or less.  Modify the route plan or cruising altitude, or divert for additional fuel. 
IRS MOTION  IRS has automatically restarted the alignment due to detection of excessive motion.  Clear message and attempt to reduce airplane movement, if practicable. 

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

Flight Management, Navigation -FMC Messages 737 Flight Crew Operations Manual
ALERTING MESSAGE  CAUSE  CORRECTIVE ACTION 
IRS NAV ONLY  U10.2A and earlier: Navigation accuracy is not sufficient for present phase of flight.  Refer to FMC Navigation Check Supplementary Procedure. 
LNAV BANK ANGLE LIMITED  U10.2 thru U10.5A: Airplane is within 5 minutes or less from an LNAV guided course change that will exceed airway/route boundaries due to LNAV performance limited bank angle. U10.6 and later: LNAV is engaged and the airplane is not on a lateral offset and is not near or in an orbit or hold and the airplane is within 5 minutes or less from an LNAV guided course change, and will exceed the airway/route boundaries for non-flyover turns less than or equal to 135 degrees due to performance limited bank angle. This message does not apply to fixed radius turns.  Review the LNAV course change. If course change exceeds airway/route boundary, consider flight plan change. 
MAX ALT FLXXX  Altitude intervention (as  Clear the message. 
(flight level value)  installed) attempt to raise cruise altitude when MCP altitude is above maximum altitude. 
MISSED CAPTURE  Proper localizer capture maneuver was performed, but the AFDS did not capture.  Clear the message. 
MODEL/ENG DATA INVALID  A valid performance database is not available.  Contact maintenance personnel. 

Copyright . The Boeing Company. See title page for details.
March 28, 2005  11.60.5
Flight Management, Navigation -FMC Messages 737 Flight Crew Operations Manual

ALERTING MESSAGE  CAUSE  CORRECTIVE ACTION 
NAV DATA OUT OF DATE  Effectivity dates of nav database do not agree with date input from clock.  Check the IDENT page and reverse the dates for ACTIVE NAV DATA if required. 
NAV INVALID–TUNE XXXXX (navaid identifier)  FMC is unable to auto–tune or receive the navaid for a RNAV or VOR approach procedure.  Cross–check radios and manually tune the desired navaid. 
OVERSPEED DISCONNECT  U10.1 and earlier: During path descent and below the speed restriction altitude, VNAV disengages when airspeed exceeeds FMC speed restriction by more than 15 knots. U10.2 and later: During path descent and above or below the speed restriction altitude, VNAV disengages when airspeed exceeeds FMC speed restriction by more than 15 knots.  Manually reduce speed and reengage VNAV. 
PARTIAL ROUTE LOADED  U10.3 and later: A route is loaded which references data not contained in the database.  Clear the message. 
PERF DEFAULTS INVALID  Validity check of performance defaults database has failed.  Contact maintenance personnel. 
　
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