737 Flight Crew Operations Manual
Flight Management, Navigation -
FMC Messages
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11.60.10 D6-27370-866-EGP
ALERTING MESSAGE CAUSE CORRECTIVE ACTION
RESET MCP ALT
(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
DISAGREE
(U10.4 and later)
During approach,
manual tuned approach
frequency or channel
does not match active
flight plan.
Clear the message and
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 alternate
performance mode.
(ECON, manual speed,
etc.)
September 15, 2016
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