Copyright . The Boeing Company. See title page for details.
December 6, 2002  11.60.3
Flight Management, Navigation -FMC/CDU Messages 737 Operations Manual

ALERTING MESSAGE  CAUSE  CORRECTIVE ACTION 
FMC APP MODE  U10.5 and later: An  Select QNH as the landing 
UNAVAIL–QFE  approach that utilizes FMC  altimeter reference on the 
generated glidepath is in  APPROACH REF page. 
the flight plan (active or  Clear the message 
inactive) but QFE is 
selected on the FMC. 
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. 
INSUFFICIENT FUEL  A change in conditions or flight plan route causes predicted fuel at destination to be 900 kilograms/2000 lbs or less. May be the result of a fuel quantity indicator inoperative.  Modify the route plan or cruising altitude, or divert for additional fuel. Use manual computations of fuel quantity remaining to determine gross weight. 
IRS MOTION  IRS has automatically restarted the alignment due to detection of excessive motion.  Clear message and attempt to reduce airplane movement, if practicable. 
IRS NAV ONLY  The FMC has downmoded to the IRS–only mode of navigation or (U7.1 – U10.2A) navigation accuracy is not sufficient for present phase of flight.  Refer to FMC Navigation Check supplementary procedure. 
LNAV BANK ANGLE  U10.2 and later: 5 minutes  Review the LNAV course 
LIMITED  prior to an LNAV guided course change that may exceed airway/route boundary due to LNAV performance limited bank angle.  change. If course change exceeds airway/route boundary, consider flight plan change. 

Copyright . The Boeing Company. See title page for details.
11.60.4  June 6, 2003

Flight Management, Navigation -FMC/CDU Messages 737 Operations Manual
ALERTING MESSAGE  CAUSE  CORRECTIVE ACTION 
MAX ALT FLXXX (flight level value)  Altitude intervention (as installed) attempt to raise cruise altitude when MCP altitude is above maximum altitude.  Reset MCP 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. 
NAV DATA OUT OF DATE  Effectivity dates of nav database do not agree with date input from clock.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. 
OFP MISCOMPARE  Primary FMC has detected a discrepancy between its software and that of the secondary FMC.  Contact maintenance personnel. 
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 exceeds FMC speed restriction by more the 15 knots.  Manually reduce speed and reengage VNAV. 

Copyright . The Boeing Company. See title page for details.
June 6, 2003  11.60.5
Flight Management, Navigation -FMC/CDU Messages 737 Operations Manual

ALERTING MESSAGE  CAUSE  CORRECTIVE ACTION 
PARTIAL ROUTE  U10.3 and later: A route is  Clear the message. 
LOADED  loaded which references data not contained in the database. 
PATH DES NOT  Within 5 NM of advisory  EXECute a SPD DES if 
AVAILABLE  top–of–descent, a path descent is planned, and a computed path is not available.  desired, or construct an adequate path (must include an “at” altitude restriction for the E/D waypoint and not have a ROUTE DISCONTINUITY). 
PERF DEFAULTS INVALID  Validity check of performance defaults database has failed.  Contact maintenance personnel. 
PROGRAM PIN  Primary FMC has detected  Contact maintenance 
MISCOMPARE  a discrepancy between its program pin configuration and that of the secondary FMC.  personnel. 
RESET MCP ALT  U10.5 and earlier: During the FMC cruise phase, when within 5 NM of the top-of-descent point without selecting a lower altitude on the AFDS MCP. U10.5A and later: During the FMC cruise phase with VNAV engaged, when within 5 NM of the top-of-descent point without selecting a lower altitude on the AFDS MCP.  Select lower MCP altitude values as clearances permit. 
　
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