(2)
If two or more messages of the same priority are set for display, the one occuring first is displayed until it is cleared, bringing up the next to occur. Messages of differing priorities are stacked for display in the same manner. Clearance of the various messages is normally accomplished by some sort of external clear: pressing the CLR key, or reversion to valid conditions that set the message. Some messages are cleared by the page being changed, which also deletes any of the entries and actions that precipitated the message.
(3)
When a message appears in the scratch pad, of any page, the CDU MSG annunciator light will illuminate. The light will illuminate even if the page on which the message appears is not currently displayed on the CDU.
C. Alerting Messages (Fig. 16)
(1)
Alerting Messages indicate some condition which must be acknowledged and remedied before further FMCS-guided flight is advisable or possible. These messages appear on the CDU. Occurence of alerting messages will also cause the FMC annunciator on the autoflight status annunciator panel to illuminate by setting the FMC message discrete. The FMC annunciator is also illuminated for system hardware failures (Fig. 1).
(2)
Display priority and the CDU MSG light for the alerting messages operate the same as the entry error advisory messages.
D. Readiness Advisory Messages (Fig. 17)
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_____________________________ENTRY ERROR ADVISORY MESSAGES MESSAGE / CONDITION
REQUIRED DATA A SEARCH OF THE NAV DATA BASE, INCLUDING TEMPORARY, DID NOT RESULT IN FINDING THE ________________NOT IN DATA BASE
__________ GUIDANCE BUFFER IS FILLED TO ALLOWABLE CAPACITY ROUTE FULL
THE ENTRY HAS AN INCORRECT FORMAT AND/OR RANGE FOR THE SELECTED CDU FIELD _____________INVALID ENTRY
______________INVALID DELETE THE DELETE KEY HAS NO APPLICATION FOR THE SELECTED FIELD
ENTRY ATTEMPTED HAS EXCEEDED THE CAPACITY FOR THE TEMPORARY OR SUPPLEMENTAL DATA BASES ______________DATA BASE FULL
CONSTRAINT ALTITUDE AT OTHER WAYPOINTS IN THE ROUTE. XXXXX IS THE FIRST DOWN-AN ADDED OR CHANGED ALTITUDE CONSTRAINT OR CRUISE ALTITUDE CONFLICTS WITH THE ____________________ALT CONSTRAINT XXXXX STREAM WAYPOINT WHICH CONFLICTS WITH THE ENTERED CONSTRAINTS
NOT IN FLIGHT PLAN__________________ ENTERED RTA WAYPOINT IS NOT IN CURRENT FLIGHT PLAN
FMCS Entry Error Advisory Messages Figure 15
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C98008
A 737-300/400/500MAINTENANCE MANUAL
ALERTING MESSAGES___________________ MESSAGE / CONDITION
____________END OF ROUTEPASSING LAST ROUTE LEG TERMINATION
_____________DISCONTINUITY PASSING LAST WAYPOINT PRIOR TO A DISCONTINUITY
FMC IN IRS ONLY MODE FOR NAVIGATION ____________IRS NAV ONLY
EITHER NOT TUNED OR A VALID SIGNAL IS NOT BEING RECEIVED ________________________NAV INVALID - TUNE XXXXX R NAV OR VOR APPROACH PROCEDURE REQUIRES A SPECIFIC NAVAID BE TUNED AND IT IS
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