FMCS Readiness Advisory Messages Figure 17 (Sheet 1)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH EFIS ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
C98081
A 737-300/400/500MAINTENANCE MANUAL
ADVISORY MESSAGES MESSAGE / CONDITION ___________________ 
UNABLE CRZ ALT______________ PERFORMANCE PREDICTS A ZERO CRUISE TIME AT THE ENTERED CRUISE ALTITUDE OR IT WILL BE UNABLE TO REACH CRUISE ALTITUDE DUE TO PERFORMANCE LIMITATIONS 
BUFFET ALERT____________ AT CURRENT CONDITIONS, THE AIRPLANE HAS A BUFFET MARGIN LESS THAN THAT SELECTED ON PERF FACTORS PAGE 
USING RSV FUEL______________ A CHANGE IN FLIGHT CONDITIONS OCCURS OR A CHANGE IN THE ROUTE IS MADE WHICH CAUSES THE COMPUTED FUEL BURN TO EXCEED THE TOTAL FUEL ON BOARD LESS ENTERED RESERVES 
ALT CONSTRAINT XXXXX____________________ A FLIGHT PLAN EDIT HAS CAUSED AN ALTITUDE CONSTRAINT TO CONFLICT WITH A CONSTRAINT ALTITUDE AT OTHER WAYPOINTS IN THE ROUTE. XXXXX IS THE FIRST DOWNSTREAM WAYPOINT AT WHICH A CONFLICT OCCURS 
DES PATH UNACHIEVABLE_____________________ AIRPLANE IS TOO FAR ABOVE THE COMPUTED DESCENT PATH TO RECAPTURE IT WITHOUT VIOLATING EXISTING ALTITUDE CONSTRAINTS 
WITHIN 5 KTS OF VMO _____________DRAG REQUIRED DUE TO UNFORECAST CONDITIONS, AIRPLANE IS 10 KT OR MORE ABOVE TARGET SPEED OR 
UNABLE MACH XXX_______________ SPEED ENTERED INTO TARGET SPEED FIELD IS IMPOSSIBLE TO ACHIEVE AT ANY ALTITUDE AT THE CURRENT AIRPLANE WEIGHT 
MAX CAS XXX___________ THE TARGET SPEED IS LIMITED BECAUSE IT EXCEEDS THE MAXIMUM BUFFET SPEED 
MAX MACH XXX____________ THE TARGET SPEED IS LIMITED BECAUSE IT EXCEEDS THE MAXIMUM BUFFET SPEED 

FMCS Readiness Advisory Messages Figure 17 (Sheet 2)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH EFIS ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
C98192
A 737-300/400/500MAINTENANCE MANUAL
ADVISORY MESSAGES___________________ MESSAGE / CONDITION 
INTERCEPT HEADING TO FACILITATE DFCS LOCALIZER CAPTURE AIRPLANE IS APPROACHING THE TURN ON TO THE LOCALIZER COURSE AND WILL HOLD AN ______________LOC CAP ACTIVE
AND LOCALIZER CAPTURE HAS NOT OCCURRED LOC CAP ACTIVE WAS DISPLAYED PREVIOUSLY, IT'S SET LOGIC IS NO LONGER SATISFIED _________________LOC CAP CANCELLED 
+10`C WITH THE ANTI-ICING SYSTEMS ON AIRPLANE IS OPERATING IN A THRUST LIMIT MODE ABOVE A TOTAL AIR TEMPERATURE OF _________________TAT ON ABOVE 10`C 
ALTITUDE ENTRY ON ANY PAGE IS ABOVE THE MAXIMUM ALTITUDE FOR ELON MODE ______________MAX ALT FL XXX 
__________________RUNWAY N/A FOR SID RUNWAY SELECTED NOT COMPATIBLE WITH DEPARTURE 
RUNWAY/APPROACH SELECTED IS NOT COMPATIBLE WITH ARRIVAL SELECTED __________________ARR N/A FOR RUNWAY 
PINS. NO FMC INTERNAL FAILURES HAVE BEEN DETECTED PROGRAM PINS ARE FOUND TO BE IN AN INVALID CONFIGURATION DURING POWER-UP CHECK OF _________________PROGRAM PIN ERROR 
ALL ALTITUDE CONSTRAINTS NO DES PATH AFTER XXXXX PROFILE PREDICTION PROCESS IS UNABLE TO CONSTRUCT A DESCENT PATH THAT SATISFIES _______________________ 
THE FMC HAS DETECTED AN UNEXPECTED DROP IN FUEL QUANTITY _______________________CHECK FMC FUEL QUANTITY 

FMCS Readiness Advisory Messages Figure 17 (Sheet 3)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH EFIS ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
C98197
A
737-300/400/500MAINTENANCE MANUAL
 (1)  
Advisory messages indicate system status for readiness of operation, or prediction of profile parameters. These messages appear on the CDU.

 (2)  
Display priority and the CDU MSG light for the readiness advisory messages operate the same as the entry error messages.

 14. Operation_________
　
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