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 system gauges 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.
June 4, 2004  11.60.13
Flight Management, Navigation -FMC/CDU Messages 737 Operations Manual

ADVISORY MESSAGE  CAUSE  CORRECTIVE ACTION 
FMC APP MODE UNAVAIL–GP  U10.5 and later: The 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.  Select an alternate 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 and select another CDU page for display. 
LOC CAP ACTIVE  The airplane 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 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 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. 

Copyright . The Boeing Company. See title page for details.
11.60.14  June 4, 2004

Flight Management, Navigation -FMC/CDU Messages 737 Operations Manual
ADVISORY MESSAGE  CAUSE  CORRECTIVE ACTION 
MCP APP DISARM REQD  U10.4 and U10.4A: A change in the expected vertical approach control from glideslope (G/S) to FMC generated glidepath (G/P) is required. U10.5 and later: A change in the expected approach is made with an FCC approach mode armed or engaged.  Clear the message. Change the active flight plan approach to one that utilizes FMC generated glidepath. Insure G/S is turned off. Re-arm approach mode if required. 
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. (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. 
PERF DEFAULTS DELETED  Performance database has been automatically deleted due to conflict with performance database limits.  Contact maintenance personnel. 
PROGRAM PIN ERROR  FMC connector wiring is incorrect.  System unusable; advise maintenance personnel. The CLR key will not clear the message. 
PROGRAM PIN NOT IN DB  FMC connector wiring or performance database is incorrect.  Contact maintenance personnel. 
　
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