AN A320 LOSES ITS AUTOMATED SYS WHEN THE AUTOPLT; AUTOTHRUST; FLT DIRECTOR SYS AND THE AIR DATA INERTIAL REF SYS FAILS. FLT WAS FLOWN MANUALLY AND ATC ADVISED OF THE ACFT PROBS AND EXPECTED ALTDEVS.

Narrative

I WAS THE CAPT OF FLT ON MAY/FRI/98; SCHEDULED ACR FLT FROM MEM TO SFO. THE FLT WAS AN AIRBUS 320 MODEL. AFTER 1 1/2 HRS INTO THE FLT THE AUTOPLT; AUTOTHRUST; AND FLT DIRECTORS DISENGAGED AND WOULD NOT RE-ENGAGE. MANUAL FLT REGIME WOULD BE THE NORM FOR THE NEXT 3 1/2 HRS. THE ECAM DISPLAYED THE LOSS OF THE AUTOMATION BUT DID NOT REVEAL WHAT CAUSED THE LOSS. LOOKING IN THE CFDS (CENTRALIZED FAULT DISPLAY SYS) PORTION OF THE COMPUTER; WE FOUND THAT A DISCREPANCY HAD OCCURRED BTWN THE #2 ADIRU (AIR DATA INERTIAL REF UNIT) AND THE OTHER TWO. AFTER TRYING TO INSTALL THE MAGNETIC HEADING IN THE #2 ADIRU; A TRY TO SYNC IT UP WAS FUTILE. AFTER LNDG; THE CAPT'S FMGC (FLT MGMNT GUIDANCE COMPUTER) SHOWED TIMED OUT; THE ECAM (ELECTRONIC CENTRALIZED ACFT MONITORING) DISPLAYED MULTIPLE FAILURES INCLUDING THE #2 ADIRU HEADING INPUT. ATC WAS ADVISED AS TO OUR LOSS OF AUTOMATION AND THE NEED FOR AIRSPACE IN OUR VICINITY TO BE CLR DUE TO THAT LOSS. ALTDEVS WERE LESS THAN 200 FT AND WE USED THAT TRACKING DEVICE ON THE NAV DISPLAY FOR NAV GUIDANCE.