Copyright . The Boeing Company. See title page for details.
June 4, 2004  11.60.15
Flight Management, Navigation -FMC/CDU Messages 737 Operations Manual

ADVISORY MESSAGE  CAUSE  CORRECTIVE ACTION 
RESET MCP ALT  Normal FMC operation would require flying away from the MCP altitude.  Select a MCP altitude value in the proper direction (higher for climb, lower for descent). 
RESET MCP APP MODE  U10.5 and later: A change in the expected approach is made with an FCC approach mode armed or engaged.  Clear and rearm FCC approach mode. Clear the message. 
RUNWAY N/A FOR SID  The selected runway is not applicable to the selected departure procedure.  Clear the message and check selections on the DEPARTURES page. Modify as required. 
SELECT ACTIVE WPT/LEG  Power–up restart or insertion of a different flight plan while airborne.  EXECute a direct–to or leg intercept to tell the FMC which leg of the route is active. 
STEEP DESCENT AFTER XXXXXX  An excessive vertical discontinuity exists after point XXXXXX.  Check routing. 
TAI ON ABOVE 10°C  Airplane is operating with anti–icing with TAT above +10°C.  Clear the message and check the use of anti–icing for engines and/or wings. 
UNABLE CRZ ALT  FMC predicts that the airplane cannot reach the new CRZ ALT due to performance limitations. FMC predicts that no cruise time is possible at the entered CRZ ALT.  Clear the message and review the CRZ ALT selection. Clear the message and review the CRZ ALT selection. 
UNABLE MACH .XXX  The entered cruise mach is unattainable based on present gross weight.  Select a smaller mach number or wait until gross weight is reduced sufficiently. 
UNABLE TO OFFSET  A valid offset cannot be constructed due to geometric limitations.  Clear the message and amend the route. 

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

Flight Management, Navigation -FMC/CDU Messages 737 Operations Manual
ADVISORY MESSAGE  CAUSE  CORRECTIVE ACTION 
USING RSV FUEL  Predicted fuel remaining at DEST is less than the RESERVES entry on the PERF INIT page. May be the result of an inoperative fuel quantity indicator.  Clear the message and change routing if required. Use manual computations of fuel quantity remaining to determine gross weight. 
VERIFY RNP VALUE  U7.3 and later: When entering an RNP the underlying RNP value is smaller than the manually entered value or the ANP is greater than the manually entered RNP.  Change or delete the manually entered RNP. 
VERIFY VERT RNP  U10.5 and later: With CDS  Clear the message. Change 
VALUE  LNAV/VNAV deviation  or delete the manually 
scales enabled, a manually  entered RNP. 
entered vertical RNP is 
greater than the default 
vertical RNP or manually 
entered vertical RNP is less 
that vertical ANP. 
V SPEEDS  FMC cannot compute V  Correct inputs that affect V 
UNAVAILABLE  speeds (as installed) due to  speed computation. 
unreasonable inputs on the 
RTE, PERF INIT, or 
TAKEOFF REF pages. 
XXXX (airport identifier)  A REF AIRPORT is entered on the POS INIT page and no entry of ORIGIN yet appears on RTE page 1.  Enter the airport identifier on the ORIGIN data line. 
XXXXX (MCP altitude  With the CRZ page  Enter the MCP altitude 
value)  displayed, resetting the  value on the appropriate 
AFDS MCP altitude to a  target altitude data line. 
value different from the 
CRZ ALT causes the value 
to appear in the scratch pad. 

Copyright . The Boeing Company. See title page for details.
June 4, 2004  11.60.17
Flight Management, Navigation -FMC/CDU Messages 737 Operations Manual

ANCDU Messages
These messages relate to incorrect scratch pad entries or to flight plan status and are unique to ANCDU operation.
ANCDU Entry Error Messages
ENTRY ERROR MESSAGE  CAUSE  CORRECTIVE ACTION 
INVALID ENTRY  Invalid format or range for selected data field.  Clear message and reenter the data correctly. 
ROUTE FULL  Attempted entry of more than 20 waypoints.  Clear message. Review flight plan for possible deletions or wait until less than 20 waypoints remain in flight plan. 
WAYPOINT NOT DEFINED  Entered waypoint identifier does not have a known position.  Reenter waypoint with a valid latitude and longitude. 
WPT PREVIOUSLY DEFINED  Attempted entry of an existing waypoint identifier using a position different from existing waypoint position.  Delete previous waypoint identifier and reenter or rename new waypoint identifier. 
　
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