Narrative:

Flying direct to FAF in A320 aircraft, both FMGC's timed out causing loss of autoplts, autothrust, flight directors, and all navigation display. Notified ATC of loss and received vectors for visual approach. I was PF and am new in this type aircraft, so all the losses of data and aids forced me to concentrate heavily on flying aircraft manually. Captain handled radios and worked on getting FMGC's back on line. Proceeded to land normally without a change in aircraft status. Upon taxiing clear of runway, I called tower to say we were clear, but radio was still tuned to approach. I suspect we landed without talking to tower or getting clearance. When we called ground control no one said anything to us, and we did not push the issue. Apparently captain was engrossed with malfunction and failed to call tower prior to landing, and with my extra concentration on flying manually, I failed to catch it. I think checklists for even normal operations should have 'landing clearance received' as part of the landing/final checklist. I am not aware of any airlines doing this now.

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Original NASA ASRS Text

Title: A320 ACFT ARRIVING FOR APCH HAD DUAL FMGC TIMEOUTS WHICH CAUSED LOSS OF AUTOPLTS, AUTOTHRUST, FLT DIRECTORS AND NAV DISPLAYS. PNF, CAPT BECAME DISTR IN RESETTING THE FMGC'S AND FLC LANDED WITHOUT TWR CLRNC.

Narrative: FLYING DIRECT TO FAF IN A320 ACFT, BOTH FMGC'S TIMED OUT CAUSING LOSS OF AUTOPLTS, AUTOTHRUST, FLT DIRECTORS, AND ALL NAV DISPLAY. NOTIFIED ATC OF LOSS AND RECEIVED VECTORS FOR VISUAL APCH. I WAS PF AND AM NEW IN THIS TYPE ACFT, SO ALL THE LOSSES OF DATA AND AIDS FORCED ME TO CONCENTRATE HEAVILY ON FLYING ACFT MANUALLY. CAPT HANDLED RADIOS AND WORKED ON GETTING FMGC'S BACK ON LINE. PROCEEDED TO LAND NORMALLY WITHOUT A CHANGE IN ACFT STATUS. UPON TAXIING CLR OF RWY, I CALLED TWR TO SAY WE WERE CLR, BUT RADIO WAS STILL TUNED TO APCH. I SUSPECT WE LANDED WITHOUT TALKING TO TWR OR GETTING CLRNC. WHEN WE CALLED GND CTL NO ONE SAID ANYTHING TO US, AND WE DID NOT PUSH THE ISSUE. APPARENTLY CAPT WAS ENGROSSED WITH MALFUNCTION AND FAILED TO CALL TWR PRIOR TO LNDG, AND WITH MY EXTRA CONCENTRATION ON FLYING MANUALLY, I FAILED TO CATCH IT. I THINK CHKLISTS FOR EVEN NORMAL OPS SHOULD HAVE 'LNDG CLRNC RECEIVED' AS PART OF THE LNDG/FINAL CHKLIST. I AM NOT AWARE OF ANY AIRLINES DOING THIS NOW.

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.