737 MAX Flight Crew Operations Manual
Flight Management, Navigation -
FMC Messages
11.60.10
MN-FLT-OH-201
ALERTING MESSAGE
CAUSE
CORRECTIVE ACTION
OVERSPEED
DISCONNECT
During path descent and
above or below the speed
restriction altitude,
VNAV disengages when
airspeed exceeds FMC
speed restriction by more
than 15 knots.
Manually reduce speed
and reengage VNAV.
PARTIAL ROUTE X
LOADED
A route is loaded into the
active/inactive RTE 1 or
2 flight plan buffer
which references data
not contained in any of
the databases.
Clear the message.
PERF DEFAULTS
INVALID
Validity check of
performance defaults
database has failed.
Contact maintenance
personnel.
RESET MCP ALT
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
DISAGREE
During approach,
manual tuned approach
frequency or channel
does not match active
flight plan.
Clear the message and
select correct approach
frequency.
March 1, 2021
