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the order of their occurrence if of the same priority. As each message is cleared,
the next message in the stack is displayed. Most messages are cleared with the
CLR key on the CDU, or by correcting the condition. Other messages are
cleared by changing the displayed page; this will delete the entry which caused
the message. The following tables list all advisory messages, their cause, and
the recommended corrective action.
ADVISORY MESSAGE CAUSE CORRECTIVE ACTION
ABOVE MAX CERT ALT The aircraft is above its
maximum certified altitude.
Descend to an altitude below
the maximum certified altitude.
ALT CONSTRAINT XXXXX
(altitude value)
Added or modified constraint
conflicts with existing
downtrack constraint(s).
Clear the message and revise
the entry.
APPRCH VREF NOT
SELECTED
Aircraft has transitioned into
approach environment and
Vref has not been selected
on APPROACH REF page.
Select Vref on APPROACH
REF page.
ARR N/A FOR RUNWAY Runway or approach does
not match the selected arrival
procedure.
Go to the ARRIVALS page and
modify selection.
BUFFET ALERT Current conditions result in a
maneuver margin less than
specified.
Bring the aircraft back within the
operating envelope.
CHECK FMC FUEL
QUANTITY
The FMC has detected an
unexpected drop in the fuel
quantity.
Check the fuel system gauges
for correctness.
DATA BASE FULL Entry attempted into a
supplemental or temporary
navigation data base category
which is full.
Go to the NAV DATA pages
and delete unneeded waypoints,
navaids, or airports from the
appropriate data base and reattempt
entry.
FLT MGMT, NAV
Sec. 2.11 Page 4
Rev. 11/15/02 #41
Continental
737
Flight Manual
ADVISORY MESSAGE CAUSE CORRECTIVE ACTION
DES PATH
UNACHIEVABLE
When in path descent and
above the path, the FMC
predictions show the profile
restrictions at the next
waypoint cannot be achieved
(LNAV remains engaged).
Modify the restrictions.
DRAG REQUIRED Airspeed is 10 kts or more
above FMC target speed or
within 5 kts of Vmo/Vmmo.
Use speedbrakes, trim or
reduced thrust, as required, to
bring the aircraft within 5 kts of
FMC target speed.
INVALID DELETE DEL key operation was
attempted for a data line to
which it was not applicable.
Clear the message and select
the proper line after the DEL key
is pressed.
INVALID ENTRY Attempted data entry has
incorrect format, range, etc.
for the selected data line.
Entered RTA waypoint is not
in the flight plan.
Clear the message and scratch
pad entry, and repeat the entry
with the correct data.
INVALID OFFSET Desired offset does not meet
FMC offset criteria.
Clear the message and amend
the entry.
LOC CAP ACTIVE The aircraft is approaching its
turn onto the localizer course
and will maintain an intercept
heading.
Clear the message manually, or
wait for the AFDS to signal
reset status to the FMC.
LOC CAP CANCELLED Flight plan modifications or
the aircraft condition did not
facilitate localizer capture.
Clear the message manually, or
wait for the AFDS to reset to
LOC CAP ACTIVE.
MAX ALT FLXXX (flight
level value)
Altitude entry on any page is
above the maximum altitude
for current selected
performance margins.
Clear the message or amend
the data entry.
MAX MACH .XXX/MIN
MACH .XXX
OR
MAX CAS .XXX/MIN CAS
.XXX
FMC target speed is greater
than the maximum or less
than the minimum buffet
speed for the entered cruise
or step climb altitude.
Change the target speed to
within the message limits or
enter a lower altitude.
NO DES PATH AFTER
XXXXX (waypoint)
FMC is unable to construct a
PATH DES that satisfies all
altitude restrictions after
XXXXX.
Modify speed or altitude
restrictions on the RTE LEGS
pages.
NOT IN DATA BASE FMC does not contain the
required data for the entered
identifier.
Clear the message and check
data entry, or enter the required
information into the
supplemental or temporary
navigation data base via the
NAV DATA pages.
737
Flight Manual
Continental
FLT MGMT, NAV
Sec. 2.11 Page 5
Rev. 11/15/02 #41
ADVISORY MESSAGE CAUSE CORRECTIVE ACTION
NOT IN FLIGHT PLAN RTA waypoint or lateral offset
start/end waypoint entry is not
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