737 MAX Flight Crew Operations Manual
Flight Management, Navigation -
FMC Messages
11.60.6
MN-FLT-OH-201
ALERTING MESSAGE
CAUSE
CORRECTIVE ACTION
FMC POS/RW
DISAGREE
Position information is
contradictory.
Refer to FMC
Navigation Check
Supplementary
Procedure.
FUEL DISAGREE
The totalizer fuel
quantity and the FMC
calculated fuel quantity
disagree.
Illuminates the FMC
P/RST Light.
Message displayed on
Engine display.
Refer to FUEL
DISAGREE non-normal
checklist in the QRH.
The Engine Display
message will remain
until the condition is no
longer valid.
GPS-L INVALID
GPS-R INVALID
FMC is no longer
receiving valid
information from the
displayed GPS system.
Clear the message.
For ADS-B operations
(if installed), when one
GPS is invalid, ensure
that the transponder
selector is positioned to
the side with the valid
GPS.
For dual GPS
installations, if both
GPS-L INVALID and
GPS-R INVALID
messages show, refer to
FMC Navigation Check
supplementary
procedure.
For single GPS
installations, refer to
FMC Navigation Check
supplementary
procedure
March 1, 2021
