Narrative:

This appears to have been some sort of database or computer processing malfunction. We initially loaded runway 34 as the approach for cyyc. The computer displayed an incorrect localizer frequency and course (it showed 109.9 and 060 degrees). Aeronautical chart for calgary 11-1 shows 111.5 and 345 degrees. They were using both runways 34 and 28 for landing. We elected to change to runway 28. Approach control cleared us to track the localizer inbound and to cross henri (11 DME on iaq localizer) at 5000 ft (1400 ft AGL). The aircraft was on autoplt and autothrottle. The approach had been activated, approach push button armed, and autoplt connected and the autothrottles rechked. We were at flaps 2 degrees and selected speed of 180 KTS. The GS was just starting to come to life. Just as we crossed henri and leveled at 5000 ft, the aircraft 'self-initiated' a go around. We gained about 400 ft before I disconnected the autoplt and very shortly thereafter the autothrottles. We descended back to 5000 ft while maintaining the localizer track. The airport was now clearly in view. We elected to continue the approach on manual raw ILS data, autoplt and autothrottle off. Landing was uneventful. Advised maintenance control of problem. Shut down and restarted both mcdu's and FMGC's. No ECAM malfunctions were ever indicated.

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Original NASA ASRS Text

Title: AN A319 ACFT CLBS ABOVE ITS ASSIGNED ALT ON A SELF INDUCED GAR PROC WHEN 11 MI SE OF CYYC, AB, CANADA.

Narrative: THIS APPEARS TO HAVE BEEN SOME SORT OF DATABASE OR COMPUTER PROCESSING MALFUNCTION. WE INITIALLY LOADED RWY 34 AS THE APCH FOR CYYC. THE COMPUTER DISPLAYED AN INCORRECT LOC FREQ AND COURSE (IT SHOWED 109.9 AND 060 DEGS). AERO CHART FOR CALGARY 11-1 SHOWS 111.5 AND 345 DEGS. THEY WERE USING BOTH RWYS 34 AND 28 FOR LNDG. WE ELECTED TO CHANGE TO RWY 28. APCH CTL CLRED US TO TRACK THE LOC INBOUND AND TO CROSS HENRI (11 DME ON IAQ LOC) AT 5000 FT (1400 FT AGL). THE ACFT WAS ON AUTOPLT AND AUTOTHROTTLE. THE APCH HAD BEEN ACTIVATED, APCH PUSH BUTTON ARMED, AND AUTOPLT CONNECTED AND THE AUTOTHROTTLES RECHKED. WE WERE AT FLAPS 2 DEGS AND SELECTED SPD OF 180 KTS. THE GS WAS JUST STARTING TO COME TO LIFE. JUST AS WE CROSSED HENRI AND LEVELED AT 5000 FT, THE ACFT 'SELF-INITIATED' A GAR. WE GAINED ABOUT 400 FT BEFORE I DISCONNECTED THE AUTOPLT AND VERY SHORTLY THEREAFTER THE AUTOTHROTTLES. WE DSNDED BACK TO 5000 FT WHILE MAINTAINING THE LOC TRACK. THE ARPT WAS NOW CLRLY IN VIEW. WE ELECTED TO CONTINUE THE APCH ON MANUAL RAW ILS DATA, AUTOPLT AND AUTOTHROTTLE OFF. LNDG WAS UNEVENTFUL. ADVISED MAINT CTL OF PROB. SHUT DOWN AND RESTARTED BOTH MCDU'S AND FMGC'S. NO ECAM MALFUNCTIONS WERE EVER INDICATED.

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.