Narrative:

Aircraft had the previous inbound write up: 'blue electric hydraulic system inoperative' and 'numerous ECAM's.' these write-ups were cleared by maintenance. Blue hydraulic had been checked on the ground. The other cleared item was the ventilation blower fan as having been selected to ovrd; reset on ground. Before departure there was an amber fan over the cockpit temperature indication. We found circuit breaker (X18) popped and we reset it with mr X. At FL340 near abi; numerous ECAM's came on; all 6 screens went blank. I had just returned from the lavatory and was sitting down. The electric movement of my seat was not working. I assigned the first officer to fly while I ran the ECAM's. The screens came back up intermittently and several ECAM's self cleared prior to being idented. The first officer selected the ventilation blower fan to ovrd based on the previous write-up. The remaining ECAM was the fuel left tk pump #1 and right tk pump #1 fault. We ran the ECAM and noted the fault on the blue electric pump southwest; but no ECAM for the blue electric hydraulic pump. We checked circuit breakers; left recirculation fan supply (X18) and avionics vent blower fan (AD10) were out. The hydraulic page showed the blue system as inoperative. Electric page showed normal outputs for the generators; idg's and thrust reversers. All 6 screens were eventually restored. Then another series of ECAM's came on and the captain's pfd and navigation display and the F/wc screens blanked (with diagonal line). First officer's screens remained normal. Autoplt remained on. Before the flight attendant returned to the cabin; I told her to be certain to call me right away if she smells any smoke or fumes; or any electrical smells. We did not note any smoke/fumesecond officerdors in the cockpit. I sent a message to dispatch and he linked in maintenance. I gave him a list of the ECAM's: circuit breakers popped X18; AD10 cabin pressure controller #1 fault blue electric pump fault GPWS system inoperative pack #1 regulator fault DME #1 inoperative left and right #1 fuel pumps fault ACARS intermittent inoperative on the status page other inoperative items were left windshield heat inoperative captain pitot inoperative. Other items: air data computer #1 fault (intermittently) captain pfd navigation display intermittently blank (sometimes shows diagonal line). Talking with mr X he had no fixes for us and suggested we leave the current circuit breakers out. The ECAM's would come on for a couple of mins; then stop. Everything would seem to be quiet again and then they would come back on -- but not really long enough to run. It seemed that primarily the affected items were on electric system #1; so perhaps there was some shedding on the #1 side. We selected captain on #3 for the air data and eis dmc. And the system seemed to quiet down. We elected to divert to den with these irregularities (approximately 1 hour flight time). The constant ECAM's seemed to settle down for about 20 mins; then they all came back up again. In our descent to den the generator #1 fault ECAM came up. After we followed the ECAM (reset the generator); the blue hydraulic pump returned to service. A couple of mins later we were inundated with all the same ECAM's again. Most of these ECAM's would pop up and disappear before we could run them. Our system confign for landing: blue electric hydraulic off (slats slow; landing distance factor 1.2; gross weight approximately 129000 pounds) #1 fuel pump in each tank off; GPWS system and terr off since my screens were intermittently blanking out. I opted for the first officer to land. He did an excellent job. A message from maintenance suggested that it was the blower fan failing; causing the AC bus to shed. Callback conversation with reporter revealed the following information: maintenance found the maintenance electrical connection to AC bus #1 to be loose. It is unknown how this came to be.

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Original NASA ASRS Text

Title: A319 CREW EXPERIENCES NUMEROUS ELECTRICAL ANOMALIES AT FL340 AND ELECTS TO DIVERT.

Narrative: ACFT HAD THE PREVIOUS INBOUND WRITE UP: 'BLUE ELECTRIC HYD SYS INOP' AND 'NUMEROUS ECAM'S.' THESE WRITE-UPS WERE CLRED BY MAINT. BLUE HYD HAD BEEN CHKED ON THE GND. THE OTHER CLRED ITEM WAS THE VENTILATION BLOWER FAN AS HAVING BEEN SELECTED TO OVRD; RESET ON GND. BEFORE DEP THERE WAS AN AMBER FAN OVER THE COCKPIT TEMP INDICATION. WE FOUND CIRCUIT BREAKER (X18) POPPED AND WE RESET IT WITH MR X. AT FL340 NEAR ABI; NUMEROUS ECAM'S CAME ON; ALL 6 SCREENS WENT BLANK. I HAD JUST RETURNED FROM THE LAVATORY AND WAS SITTING DOWN. THE ELECTRIC MOVEMENT OF MY SEAT WAS NOT WORKING. I ASSIGNED THE FO TO FLY WHILE I RAN THE ECAM'S. THE SCREENS CAME BACK UP INTERMITTENTLY AND SEVERAL ECAM'S SELF CLRED PRIOR TO BEING IDENTED. THE FO SELECTED THE VENTILATION BLOWER FAN TO OVRD BASED ON THE PREVIOUS WRITE-UP. THE REMAINING ECAM WAS THE FUEL L TK PUMP #1 AND R TK PUMP #1 FAULT. WE RAN THE ECAM AND NOTED THE FAULT ON THE BLUE ELECTRIC PUMP SW; BUT NO ECAM FOR THE BLUE ELECTRIC HYD PUMP. WE CHKED CIRCUIT BREAKERS; L RECIRCULATION FAN SUPPLY (X18) AND AVIONICS VENT BLOWER FAN (AD10) WERE OUT. THE HYD PAGE SHOWED THE BLUE SYS AS INOP. ELECTRIC PAGE SHOWED NORMAL OUTPUTS FOR THE GENERATORS; IDG'S AND THRUST REVERSERS. ALL 6 SCREENS WERE EVENTUALLY RESTORED. THEN ANOTHER SERIES OF ECAM'S CAME ON AND THE CAPT'S PFD AND NAV DISPLAY AND THE F/WC SCREENS BLANKED (WITH DIAGONAL LINE). FO'S SCREENS REMAINED NORMAL. AUTOPLT REMAINED ON. BEFORE THE FLT ATTENDANT RETURNED TO THE CABIN; I TOLD HER TO BE CERTAIN TO CALL ME RIGHT AWAY IF SHE SMELLS ANY SMOKE OR FUMES; OR ANY ELECTRICAL SMELLS. WE DID NOT NOTE ANY SMOKE/FUMES/ODORS IN THE COCKPIT. I SENT A MESSAGE TO DISPATCH AND HE LINKED IN MAINT. I GAVE HIM A LIST OF THE ECAM'S: CIRCUIT BREAKERS POPPED X18; AD10 CABIN PRESSURE CTLR #1 FAULT BLUE ELECTRIC PUMP FAULT GPWS SYS INOP PACK #1 REGULATOR FAULT DME #1 INOP L AND R #1 FUEL PUMPS FAULT ACARS INTERMITTENT INOP ON THE STATUS PAGE OTHER INOP ITEMS WERE L WINDSHIELD HEAT INOP CAPT PITOT INOP. OTHER ITEMS: ADC #1 FAULT (INTERMITTENTLY) CAPT PFD NAV DISPLAY INTERMITTENTLY BLANK (SOMETIMES SHOWS DIAGONAL LINE). TALKING WITH MR X HE HAD NO FIXES FOR US AND SUGGESTED WE LEAVE THE CURRENT CIRCUIT BREAKERS OUT. THE ECAM'S WOULD COME ON FOR A COUPLE OF MINS; THEN STOP. EVERYTHING WOULD SEEM TO BE QUIET AGAIN AND THEN THEY WOULD COME BACK ON -- BUT NOT REALLY LONG ENOUGH TO RUN. IT SEEMED THAT PRIMARILY THE AFFECTED ITEMS WERE ON ELECTRIC SYS #1; SO PERHAPS THERE WAS SOME SHEDDING ON THE #1 SIDE. WE SELECTED CAPT ON #3 FOR THE AIR DATA AND EIS DMC. AND THE SYS SEEMED TO QUIET DOWN. WE ELECTED TO DIVERT TO DEN WITH THESE IRREGULARITIES (APPROX 1 HR FLT TIME). THE CONSTANT ECAM'S SEEMED TO SETTLE DOWN FOR ABOUT 20 MINS; THEN THEY ALL CAME BACK UP AGAIN. IN OUR DSCNT TO DEN THE GENERATOR #1 FAULT ECAM CAME UP. AFTER WE FOLLOWED THE ECAM (RESET THE GENERATOR); THE BLUE HYD PUMP RETURNED TO SVC. A COUPLE OF MINS LATER WE WERE INUNDATED WITH ALL THE SAME ECAM'S AGAIN. MOST OF THESE ECAM'S WOULD POP UP AND DISAPPEAR BEFORE WE COULD RUN THEM. OUR SYS CONFIGN FOR LNDG: BLUE ELECTRIC HYD OFF (SLATS SLOW; LNDG DISTANCE FACTOR 1.2; GROSS WT APPROX 129000 LBS) #1 FUEL PUMP IN EACH TANK OFF; GPWS SYS AND TERR OFF SINCE MY SCREENS WERE INTERMITTENTLY BLANKING OUT. I OPTED FOR THE FO TO LAND. HE DID AN EXCELLENT JOB. A MESSAGE FROM MAINT SUGGESTED THAT IT WAS THE BLOWER FAN FAILING; CAUSING THE AC BUS TO SHED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: MAINT FOUND THE MAINT ELECTRICAL CONNECTION TO AC BUS #1 TO BE LOOSE. IT IS UNKNOWN HOW THIS CAME TO BE.

Data retrieved from NASA's ASRS site as of January 2009 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.