Narrative:

While in cruise, both mcdu's failed to respond to pilot inputs. The aircraft remained on course in l-nav mode. Pilots used stand-by navigation procedures to verify course. We contacted dispatch and requested a phone patch with maintenance controller. Maintenance controller had us reset various circuit breakers in an attempt to correct the problem. Both mcdu's remained in the frozen state. Maintenance control recommended a reset of FMGC circuit breaker. Captain's emergency authority/authorized was used, and FMGC circuit breaker was reset. Both mcdu's became operational. Flight continued to destination without incident. ATC was not notified. Aircraft remained on course.

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Original NASA ASRS Text

Title: AN AIRBUS 320, IN CRUISE AT FL330, EXPERIENCED BOTH MCDU'S LOCK UP. RESETTING CIRCUIT BREAKER FUNCTIONS RETURNED THEN TO NORMAL, UNDER PIC EMER COMMAND AUTH.

Narrative: WHILE IN CRUISE, BOTH MCDU'S FAILED TO RESPOND TO PLT INPUTS. THE ACFT REMAINED ON COURSE IN L-NAV MODE. PLTS USED STAND-BY NAV PROCS TO VERIFY COURSE. WE CONTACTED DISPATCH AND REQUESTED A PHONE PATCH WITH MAINT CTLR. MAINT CTLR HAD US RESET VARIOUS CIRCUIT BREAKERS IN AN ATTEMPT TO CORRECT THE PROB. BOTH MCDU'S REMAINED IN THE FROZEN STATE. MAINT CTL RECOMMENDED A RESET OF FMGC CIRCUIT BREAKER. CAPT'S EMER AUTH WAS USED, AND FMGC CIRCUIT BREAKER WAS RESET. BOTH MCDU'S BECAME OPERATIONAL. FLT CONTINUED TO DEST WITHOUT INCIDENT. ATC WAS NOT NOTIFIED. ACFT REMAINED ON COURSE.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.