Copyright . The Boeing Company. See title page for details.
11.60.6 June 4, 2004
Flight Management, Navigation -FMC/CDU Messages 737 Operations Manual
ALERTING MESSAGE CAUSE CORRECTIVE ACTION
RW/APP CRS ERROR U10.4 and later: During approach, MCP selected course does not match front course for the approach in the active flight plan. Clear the message and select correct MCP course.
RW/APP TUNE DISAGREE U10.4 and later: During approach, manual tuned approach frequency or channel does not match active flight plan. Clear the message and select correct approach frequency.
SCANNING DME FAIL Inputs from frequency scanning DME radio(s) have failed. Clear the message and check position. Radio updating of FMC position is not available.
SELECT MODE AFTER RTA RTA mode has been discontinued due to sequencing of RTA waypoint or RTA waypoint has been removed from the flight plan. Select desired navigation mode. (ECON, manual speed, etc.)
SINGLE FMC OPERATION The primary FMC has determined that the secondary FMC is not available. (Dual FMC as installed) If FMC source selector switch is in Normal Position, move to “BOTH ON L.” No action required if FMC source selector switch is already on “BOTH ON L” or “BOTH ON R.”
SINGLE IRS NAV Navigation environment is OCEANIC and one IRS is invalid. NONE
SW OPTIONS INVALID The validity check of the software options database has failed. Contact maintenance personnel.
Copyright . The Boeing Company. See title page for details.
June 4, 2004 11.60.7
Flight Management, Navigation -FMC/CDU Messages 737 Operations Manual
ALERTING MESSAGE CAUSE CORRECTIVE ACTION
TAKEOFF SPEEDS U10.1 and later: New Select new V speeds.
DELETED performance data is entered after the V speeds have been entered on the TAKEOFF REF page, or a takeoff thrust selection change is entered after the V speeds have been entered. or U10.0: Runway is changed after the V speeds have been entered.
THRUST REQUIRED U10.5 and later: Airplane is in an underspeed condition. Clear the message. Increase airspeed to within 15 knots of speed target.
UNABLE HOLD U10.2 and later: LNAV Review the holding pattern.
AIRSPACE guided holding pattern may exceed allowable hold airspace due to LNAV performance limited bank angle. If holding pattern exceeds allowable holding airspace, consider flight plan change.
UNABLE NEXT Prior to U5: Due to Clear the message and
ALTITUDE undershoot, the next climb review the prediction. For
constraint cannot be undershoot condition
achieved (VNAV engaged). during climb, consider
U5 and later: Unable to meet the next flight plan altitude constraint in a VNAV SPD climb or selection of MAX RATE CLB or MAX ANGLE CLB, or a different N1 limit as appropriate.
descent. The message
appears only with VNAV
engaged.
Copyright . The Boeing Company. See title page for details.
11.60.8 June 4, 2004
Flight Management, Navigation -FMC/CDU Messages 737 Operations Manual
ALERTING MESSAGE CAUSE CORRECTIVE ACTION
UNABLE REQD NAV U7.1 – U10.2A: FMC Refer to FMC Navigation
PERF – RNP actual navigation performance is not sufficient for the current special RNP (crew entered or leg specified). U10.3 and later: FMC actual navigation performance is not sufficient for the displayed RNP. Check supplementary procedure.
VERIFY GW AND FUEL Fuel data becomes invalid, PERF INIT fuel value is replaced with dashes. FMC uses last valid fuel quantity for performance predictions until manual entry is made. Shows if 30 minutes have elapsed since last manual entry. Does not show in descent with Vref selected. Enter fuel weight on PERF INIT page 1/2. Periodic update of fuel weight is required to keep gross weight value current.
VERIFY OFFSET A flight plan change has resulted in a conflict in reference to an offset start or end waypoint. Confirm ATC clearance and make appropriate adjustments to RTE.
VERIFY POSITION Position information is contradictory. Inhibited during approach. Refer to FMC Navigation Check Supplementary Procedure.
Copyright . The Boeing Company. See title page for details.
June 4, 2004 11.60.9
Flight Management, Navigation -FMC/CDU Messages 737 Operations Manual
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