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.
D6-27370-866-EGP 11.60.3
ALERTING MESSAGE CAUSE CORRECTIVE ACTION
CUTBACK
U N AVA I L A B L E
(U10.3 and later)
The FMC is unable to
compute a Cutback N1
value.
Clear the message.
CYCLE IRS OFF–NAV IRS is unable to
complete alignment
under current conditions.
Cycle IRS mode selector
to “OFF” and back to
“NAV.”
DATA BASE INVALID The automatic validity
test of the permanent
navigation database has
failed.
Advise maintenance
personnel to check the
FMC and reload the
database, as required. If
desired, consider the use
of the temporary nav
database.
DISCO INSRTD AFTR
XXXXX (waypoint
identifier)
A ROUTE
DISCONTINUITY has
been inserted into the
flight plan due to
undefined termination of
a downpath leg or a triple
waypoint BYPASS.
Select the RTE or RTE
LEGS pages and modify
the waypoints for a
continuous route.
DISCONTINUITY Passing the last waypoint
in the route prior to a
ROUTE
DISCONTINUITY
(LNAV disengages) or
pressing LNAV while in
a discontinuity.
Select the RTE LEGS
page. Enter the desired
active waypoint into the
box prompts. Correct
any ROUTE
DISCONTINUITY and
EXECute. Reengage
LNAV.
DRAG REQ AFTER
XXXXX
(U10.7 and later)
A waypoint speed
constraint greater than 10
knots above the
predicted speed exists at
waypoint XXXXX.
Modify flight plan as
required.
Clear the message.
END OF OFFSET Two minutes prior to
passing offset leg
termination.
Confirm clearance.
September 15, 2016
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