737 MAX Flight Crew Operations Manual
Flight Management, Navigation -
FMC Messages
11.60.16
MN-FLT-OH-201
ALERTING MESSAGE
CAUSE
CORRECTIVE ACTION
VERIFY TAKEOFF
THRUST
With the Takeoff Thrust
Auto Selection option
enabled, the system
determines that the
selected takeoff thrust
setting is not compatible
with the engine thrust
rating configuration.
Clear the message.
Manually change takeoff
thrust setting, or accept
uplink of different thrust
setting.
VERIFY VERT RNP
During an active descent
with navigation
performance scales
enabled, a manually
entered vertical RNP is
greater than the default
vertical RNP.
Clear CDU message.
Enter appropriate
vertical RNP.
VNAV DISCONNECT
The criteria for VNAV
engagement is not
satisfied (VNAV
disengages).
On approach, with
VNAV engaged, the
FCC has switched to
LVL CHG.
Manually control the
vertical path.
VNAV INVALID-PERF If the exception affects
both the MOD and the
ACT flight plan, the Cost
Index (CI) will be
replaced with box
prompts on the PERF
INIT page and the
message will result.
LNAV is still valid and
can navigate the airplane
laterally but VNAV will
disconnect. Reference
section 11.32 for further
Software Exception
Logic.
Pilot should reenter the
CI using either the
previous CI displayed or
enter a new CI.
Reengage VNAV when
change has been
EXECuted.
March 1, 2021
