737 Flight Crew Operations Manual
Flight Management, Navigation -
FMC Messages
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11.60.8 D6-27370-866-EGP
ALERTING MESSAGE CAUSE CORRECTIVE ACTION
MODEL/ENG DATA
INVALID
A valid performance
database is not available.
Contact maintenance
personnel.
NAV DATA OUT OF
DATE
Effectivity dates of nav
database do not agree
with date input from
clock.
Check the IDENT page
and reverse the dates for
ACTIVE NAV DATA if
required.
NAV INVALID–TUNE
XXXXX (navaid
identifier)
FMC is unable to auto–
tune or receive the
navaid for a RNAV or
VOR approach
procedure.
Cross–check radios and
manually tune the
desired navaid.
NO VNAV AFTER
XXXXX,
(U11.0 and later)
The descent path is
monitored independent
of path construction for
the following scenarios:
A) - an “at”, “at or
above”, “at or below” or
“window” constraint is
violated
B) - a navigation data
base gradient (vertical
angle) is violated
If a violation is detected
and not resolved, VNAV
will disconnect after the
point of the violation.
The alerting message is
displayed one minute
prior to the violation.
After sequencing
waypoint XXXXX,
VNAV INVALID -
PERF logic applies:
Pilot should reenter the
CI using either the
previous CI displayed or
enter a new CI.
Reengage VNAV when
change has been
EXECuted.
September 15, 2016
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