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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
During path descent and
below the speed restriction
altitude, VNAV disengages
when airspeed exceeds FMC
speed restriction by more than
15 knots.
Manually reduce speed and
reengage VNAV.
PATH DES NOT
AVAILABLE
Within 5 NM of advisory top–
of–descent, a path descent is
planned, and a computed path
is not available.
EXECute a SPD DES if
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 data base has failed.
Contact maintenance
personnel.
PROGRAM PIN
MISCOMPARE
Primary FMC has detected a
discrepancy between its
program pin configuration and
that of the secondary FMC.
Contact maintenance
personnel.
RESET MCP ALT 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.
SW OPTIONS INVALID The validity check of the
software options data base
has failed.
Contact maintenance
personnel.
SCANNING DME FAIL Inputs from the frequency
scanning DME radio 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.)
FLT MGMT, NAV
Sec. 2.11 Page 10
Rev. 11/15/02 #41
Continental
737
Flight Manual
ALERTING MESSAGE CAUSE CORRECTIVE ACTION
SINGLE FMC
OPERATION
The primary FMC has
determined that the secondary
FMC is not available.
Move FMC source selector
switch to “BOTH ON L” or
“BOTH ON R”.
SINGLE IRS NAV Navigation environment is
OCEANIC and one IRS is
invalid.
NONE
UNABLE NEXT ALTITUDE (Prior to U5) Due to
undershoot, the next climb
constraint cannot be achieved
(VNAV engaged).
(U5 and on) Unable to meet
the next flight plan altitude
constraint in a VNAV SPD
climb or descent. The
message appears only with
VNAV engaged.
Clear the message and review
the prediction. Consider
selection of MAX RATE CLB
or MAX ANGLE CLB, or a
different N1 limit as
appropriate.
UNABLE REQUIRED NAV
PERFORMANCE – RNP
FMC actual navigation
performance is not sufficient
for the current special RNP
(crew entered or leg specified).
Revert to raw data if able.
Check updating status. Go-
Around if required.
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.
Refer to POS SHIFT 3/3 for
FMC sensor comparisons.
VERIFY RNP Underlying RNP value is less
than manually entered value or
a GPS approach has been
selected and the default RNP
is active.
Enter appropriate RNP.
VERIFY TAKEOFF
SPEEDS
A PERF INIT change has
been made after takeoff
speeds were specified.
Enter new takeoff speeds.
VNAV DISCONNECT The criteria for VNAV
engagement is not satisfied
(VNAV disengages).
Manually control the vertical
path.
737
Flight Manual
Continental
FLT MGMT, NAV
Sec. 2.11 Page 11
Rev. 11/15/02 #41
>>@ FMC FAILURE WITH SINGLE FMC
The failure of the FMC is indicated by:
· FMC ALERT light.
· FAIL light on the CDU.
· FMC displayed in center of CDU.
If an FMC failure occurs the FMC / CDU, LNAV and VNAV are inoperative.
Resume conventional navigation.
* * * *
BCD GPS
　
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