Narrative:

While operating flight from ZZZ1 to ZZZ2 at FL350; we received an 'aft avionics compartment' warning; red light smoke indication; followed by a continuous horn on the overhead panel. This did not have associated ECAM action. I silenced the alarm and asked the first officer for the QRH procedure. After he accomplished the QRH; the red light warning stayed on and we received a second alarm warning. At that time; I declared an emergency and ATC vectored me to ZZZ. During the descent; I asked the first officer to go to the position manual to review and get as much information as possible; time permitting; until final vectors for landing were provided. I informed the cabin crew of the plan and notified the passenger. This was followed by the overweight landing procedure from QRH. I briefed the approach and ran all the checklists and accomplished the overweight landing at runway 17R. Upon landing; we received a third smoke warning and alarm; at which point I stopped at the runway and requested a visual inspection from the emergency personnel. The visual inspection; including 'crash fire rescue equipment' inspection; was completed and they told us that there was no visual smoke or fire present. After the emergency personnel cleared us; we taxied to the parking area of the emergency services followed by one of the emergency trucks. The emergency services personnel completed all the required inspections with the emergency personnel. During this time; we maintained constant phone contact with maintenance and dispatch in ZZZ1 and with coordination of the emergency services personnel they approved to clear the avionics smoke malfunction and overweight landing. They also performed all the necessary MEL's. At that time we were refueled and received a new flight plan and release and departed for ZZZ2 without further problems.

Related reports:

Google
 

Original NASA ASRS Text

Title: AN A320 IN CRUISE AT FL360 DECLARED AN EMER AND DIVERTED DUE TO AFT AVIONICS COMPARTMENT RED SMOKE LIGHT AND AURAL WARNING.

Narrative: WHILE OPERATING FLT FROM ZZZ1 TO ZZZ2 AT FL350; WE RECEIVED AN 'AFT AVIONICS COMPARTMENT' WARNING; RED LIGHT SMOKE INDICATION; FOLLOWED BY A CONTINUOUS HORN ON THE OVERHEAD PANEL. THIS DID NOT HAVE ASSOCIATED ECAM ACTION. I SILENCED THE ALARM AND ASKED THE FO FOR THE QRH PROC. AFTER HE ACCOMPLISHED THE QRH; THE RED LIGHT WARNING STAYED ON AND WE RECEIVED A SECOND ALARM WARNING. AT THAT TIME; I DECLARED AN EMER AND ATC VECTORED ME TO ZZZ. DURING THE DSCNT; I ASKED THE FO TO GO TO THE POS MANUAL TO REVIEW AND GET AS MUCH INFO AS POSSIBLE; TIME PERMITTING; UNTIL FINAL VECTORS FOR LNDG WERE PROVIDED. I INFORMED THE CABIN CREW OF THE PLAN AND NOTIFIED THE PAX. THIS WAS FOLLOWED BY THE OVERWT LNDG PROC FROM QRH. I BRIEFED THE APCH AND RAN ALL THE CHKLISTS AND ACCOMPLISHED THE OVERWT LNDG AT RWY 17R. UPON LNDG; WE RECEIVED A THIRD SMOKE WARNING AND ALARM; AT WHICH POINT I STOPPED AT THE RWY AND REQUESTED A VISUAL INSPECTION FROM THE EMER PERSONNEL. THE VISUAL INSPECTION; INCLUDING 'CFR' INSPECTION; WAS COMPLETED AND THEY TOLD US THAT THERE WAS NO VISUAL SMOKE OR FIRE PRESENT. AFTER THE EMER PERSONNEL CLRED US; WE TAXIED TO THE PARKING AREA OF THE EMER SVCS FOLLOWED BY ONE OF THE EMER TRUCKS. THE EMER SVCS PERSONNEL COMPLETED ALL THE REQUIRED INSPECTIONS WITH THE EMER PERSONNEL. DURING THIS TIME; WE MAINTAINED CONSTANT PHONE CONTACT WITH MAINT AND DISPATCH IN ZZZ1 AND WITH COORD OF THE EMER SVCS PERSONNEL THEY APPROVED TO CLR THE AVIONICS SMOKE MALFUNCTION AND OVERWT LNDG. THEY ALSO PERFORMED ALL THE NECESSARY MEL'S. AT THAT TIME WE WERE REFUELED AND RECEIVED A NEW FLT PLAN AND RELEASE AND DEPARTED FOR ZZZ2 WITHOUT FURTHER PROBS.

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.