.
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. 
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 airplane within 5 kts of FMC target speed. 

Copyright . The Boeing Company. See title page for details.
September 27, 2004  11.60.13
Flight Management, Navigation -FMC Messages 737 Flight Crew Operations Manual

ADVISORY MESSAGE  CAUSE  CORRECTIVE ACTION 
FMC APP MODE  U10.5 and later: The  Select an alternate 
UNAVAIL–GP  approach selected in the FMC does not have a specified glidepath angle for final approach. The FMC approach mode cannot be used for this approach.  approach. Clear the message. 
INVALID OFFSET  Desired offset does not meet FMC offset criteria.  Clear the message and amend the entry. 
KEY/FUNCTION INOP  A mode key is pressed for which an FMC function has not been implemented or has not been enabled. (FANS MCDU only)  Clear the message or select another CDU page for display. 
LOC CAP ACTIVE  The airplane is approaching its turn onto the localizer or GLS 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 airplane 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  Altitude entry on any page  Clear the message or 
level value)  is above the maximum altitude for current selected performance margins.  amend the data entry. 
MAX MACH .XXX/MIN  FMC target speed is greater  Change the target speed to 
MACH .XXX  than the maximum or less  within the message limits 
OR  than the minimum buffet speed for the entered cruise  or enter a lower altitude. 
MAX CAS .XXX/MIN  or step climb altitude. 
CAS .XXX 
MCP APP DISARM  U10.4 and U10.4A: A  Clear the message. Change 
REQD  change in the expected  the active flight plan 
vertical approach control  approach to one that 
from glideslope (G/S) to  utilizes FMC generated 
FMC generated glidepath  glidepath. Check that G/S 
(G/P) is required.  is turned off. Re-arm 
approach mode if required. 

Copyright . The Boeing Company. See title page for details.
11.60.14  March 28, 2005

Flight Management, Navigation -FMC Messages 737 Flight Crew Operations Manual
ADVISORY MESSAGE  CAUSE  CORRECTIVE ACTION 
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 ON INTERCEPT HEADING  Airplane is not within the LNAV capture criteria for the active leg (LNAV disengages).  Manually place the airplane on an intercept heading and reengage LNAV. 
OFFSET DELETED  The entered start waypoint has been deleted from the flight plan. (lateral offset as installed)  Clear the message and amend the route. 
OFST ENDS ABEAM XXXXXX  An invalid offset leg exists between the end waypoint (XXXXXX) and the start of offset or no end waypoint exists.  Clear the message and amend the route. 
　
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