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NAV DATA OUT OF DATE Effectivity dates of nav database do not agree with date input from clock.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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