737 Flight Crew Operations Manual
Flight Management, Navigation -
FMC Messages
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11.60.18 D6-27370-866-EGP
FMC Advisory Messages
These messages relate to FMC status. FMC advisory messages:
• are shown in the CDU scratchpad
• illuminate message lights (MSG) on both CDUs.
Use the CLR key or correct the condition responsible for the message to remove
the message. The message is temporarily removed from the scratchpad when
manually entering data. The message returns when the data is removed from the
scratchpad.
ADVISORY MESSAGE CAUSE CORRECTIVE ACTION
ABOVE MAX CERT
ALT
The airplane is above its
maximum certified
altitude.
Descend to an altitude
below the maximum
certified altitude.
APPRCH VREF NOT
SELECTED
Airplane 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 airplane back
within the operating
envelope.
CHECK FMC FUEL
QUANTITY
The FMC has detected
an unexpected drop in
the fuel quantity.
Check the fuel quantity
indications for
correctness.
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.
September 15, 2016
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