Copyright . The Boeing Company. See title page for details.
11.60.6 March 28, 2005
Flight Management, Navigation -FMC Messages 737 Flight Crew Operations Manual
ALERTING MESSAGE CAUSE CORRECTIVE ACTION
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.
RTA UNACHIEVABLE The RTA is not in the computed RTA window under current parameters. Enter an achievable RTA or discontinue the RTA mode of navigation. Adjust parameters to meet the RTA.
RW/APP TUNE U10.4 and later: During Clear the message and
DISAGREE approach, manual tuned approach frequency or channel does not match active flight plan. select correct approach frequency.
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.
SCANNING DME FAIL Inputs from both frequency scanning DME radios 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.)
Copyright . The Boeing Company. See title page for details.
March 28, 2005 11.60.7
Flight Management, Navigation -FMC Messages 737 Flight Crew Operations Manual
ALERTING MESSAGE CAUSE CORRECTIVE ACTION
SINGLE FMC The primary FMC has If the FMC source selector
OPERATION determined that the secondary FMC is not available. (Dual FMC as installed) switch is in the “Normal” position, move to “BOTH ON L”. No action is required if the FMC source selector switch is already positioned to “BOTH ON L” or “BOTH ON R”.
TAKEOFF SPEEDS U10.0: Runway or runway Reselect new V speeds and
DELETED data is changed after the V speeds have been entered. U10.1 thru U10.5A: A change to runway, runway data, takeoff thrust selection or performance data is made after the V speeds have been selected. U10.6 and later: A change to runway, runway data, takeoff thrust selection or performance data is made after the V speeds have been selected, or entered V speeds fail to meet relative value check. clear message.
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.
Copyright . The Boeing Company. See title page for details.
11.60.8 March 28, 2005
Flight Management, Navigation -FMC Messages 737 Flight Crew Operations Manual
ALERTING MESSAGE CAUSE CORRECTIVE ACTION
UNABLE NEXT Unable to meet the next Clear the message and
ALTITUDE flight plan altitude constraint in a VNAV SPD climb or descent. The message appears only with VNAV engaged. U10.4 and later: Unable to meet the next flight plan review the prediction. For undershoot condition during climb, consider selection of MAX RATE CLB or MAX ANGLE CLB, or a different N1 limit as appropriate.
altitude constraint in a VNAV climb or descent. The message appears only with VNAV engaged.
UNABLE PROC U10.6 and later: Minimum Modify flight plan as
AIRSPACE procedure turn built by guidance exceeds the allowable excursion distance. required. Clear the message.
UNABLE REQD NAV U10.2A and earlier: FMC During approach: Refer to
PERF–RNP actual navigation performance is not sufficient for the current special RNP (crew entered or leg specified). UNABLE REQD NAV PERF - RNP non-normal checklist in the QRH. During other phases of flight: Refer to the FMC
U10.3 and later: FMC actual navigation performance is not sufficient for the displayed RNP. Navigation Check supplementary procedure in SP.11.
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.
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