737 Flight Crew Operations Manual
Flight Management, Navigation -
FMC Messages
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
11.60.6 D6-27370-866-EGP
ALERTING MESSAGE CAUSE CORRECTIVE ACTION
GPS-L INVALID
GPS-R INVALID
(U10.7 and later)
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
INSUFFICIENT FUEL
(U13.0 and earlier)
A change in conditions
or flight plan route
causes predicted fuel at
destination to be 2000
lbs/900 kilograms or
less.
Modify the route plan or
cruising altitude, or
divert for additional fuel.
IRS MOTION IRS has automatically
restarted the alignment
due to detection of
excessive motion.
Clear message and
attempt to reduce
airplane movement, if
practicable.
September 24, 2015
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