737 MAX Flight Crew Operations Manual
Flight Management, Navigation -
FMC Messages
MN-FLT-OH-201
11.60.23
ADVISORY MESSAGE
CAUSE
CORRECTIVE ACTION
RUNWAY N/A FOR
SID
The selected runway is
not applicable to the
selected departure
procedure.
Clear the message and
check selections on the
DEPARTURES page.
Modify as required.
SELECT ACTIVE
WPT/LEG
Power–up restart or
insertion of a different
flight plan while
airborne.
EXECute a direct–to or
leg intercept to tell the
FMC which leg of the
route is active.
STEEP DESCENT
AFTER XXXXXX
An excessive vertical
discontinuity exists after
point XXXXXX.
Check routing.
TAI ON ABOVE 10°C
Airplane is operating
with anti–icing with TAT
above +10°C.
Clear the message and
check the use of
anti–icing for engines
and/or wings.
UNABLE CRZ ALT
FMC predicts that no
cruise time is possible at
the entered CRZ ALT.
Clear the message and
review the CRZ ALT
selection.
UNABLE MACH. XXX The entered cruise Mach
is unattainable based on
present gross weight.
Select a smaller Mach
number or wait until
gross weight is reduced
sufficiently.
UNABLE TO OFFSET
A valid offset cannot be
constructed due to
geometric limitations.
Clear the message and
amend the route.
V SPEEDS
UNAVAILABLE
FMC cannot compute
V speeds (as installed)
due to unreasonable
inputs on the RTE, PERF
INIT, or TAKEOFF REF
pages.
Correct inputs that affect
V speed computation.
March 1, 2021
