What was found
PDIS 743 34-14 3667 18AUG21 OKC OPEN U APPROACHING KOKC (50 MINUTES INTO FLIGHT), CAPTAIN S AIRSPEED TAPE WENT TO ZERO AND ALTIMETER JUMPED TO 250 FEET HIGH AT FL340. FD, AT AND AP WENT AWAY ACCORDINGLY. CAPTAIN S AIRSPEED RECOVERED AND FAILED MULTIPLE TIMES DURING THE DIVERT. THE ONLY ECAM WARNINGS WERE IAS DISCREPANCY AND AUTOTHROTTLE RESET DURING PERIODS OF RECOVERY. FIRST OFFICER S INFORMATION ALWAYS LOOKED GOOD. SHGN 18AUG21 14:09 OKC U REPLACED #1 ADC 1FL1 IAW AMM 34-11-34-04. BITE TEST GOOD IAW AMM 34-10-00 PB501. ENT BY: 285853 RPT BY: 285853 FACT 18AUG21 18:23 OKC U TROUBLE SHOT IAW TSM 34-10-00 FIGURE 11O AND FOUND NO DISCREPANCES EITH CAPTS PITOT PROBE OR LINES. PERFORM LEAK CHECK OF CAPTS PITOT IAW AMM 34-10-00-05 STEP 5 AND IT REMAINED AT 310 KTS FOR 10 MINS WITHOUT A 15KNT VARIATION. NO MOISTURE OR DEBRIS IN PITOT DRAINS AND PITOT TUBES AND STATC PORTS ARE NORMAL IAW TSM 34-10-00. REPLACED ADC, OPS CHECKS GOOD A/C OK TO CONTINUE. PERFORMED AFS/LAND CHECK SUCESSFULLY, REMAINS CAT III