737 Flight Crew Operations Manual
Flight Management, Navigation -
FMC Messages
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D6-27370-866-EGP 11.60.7
ALERTING MESSAGE CAUSE CORRECTIVE ACTION
IRS-(L or R) DRIFT
(U11.0 and later)
An FMC has detected
that the IRS-(L or R)
position or velocity data
is unreasonable, and
deselected IRS-(L or R)
due to velocity
divergence or position
blunder checks.
Refer to FMC
Navigation Check
Supplementary
Procedure.
IRS POS/ORIGIN
DISAGREE
(U10.7 and later)
Position information is
contradictory.
Refer to FMC
Navigation Check
Supplementary
Procedure.
LNAV BANK ANGLE
LIMITED
(U10.6 and later)
LNAV is engaged and
the airplane is not on a
lateral offset and is not
near or in an orbit or hold
and the airplane is within
5 minutes or less from an
LNAV guided course
change, and will exceed
the airway/route
boundaries for
non-flyover turns less
than or equal to 135
degrees due to
performance limited
bank angle. This
message does not apply
to fixed radius turns.
Review the LNAV
course change. If course
change exceeds
airway/route boundary,
consider flight plan
change.
MAX ALT FLXXX
(flight level value)
Altitude intervention (as
installed) attempt to raise
cruise altitude when
MCP altitude is above
maximum altitude.
Clear the message.
MISSED CAPTURE Proper localizer capture
maneuver was
performed, but the
AFDS did not capture.
Clear the message.
March 31, 2016
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