What was found
AT FL350, .78 MACH, ABOUT 1 HOUR INTO FLIGHT, FO SPEED TAPE BEGAN ROLLING BACK FOLLOWED BY IAS DISCREPANCY ECAM ALERT. FOLLOWED ECAM AND QRH SWITCHING TO SYS 1 ADC ON FO SIDE. SUSPECT ADC2 FAILURE. R & R NO.2 ADC, PERFORMED SATISFACTORY ADS2 BITE TEST. COMPLIED WITH LLM MTC PROCEDURE: AMM: 34-11- 34-04 AMM: 22-00-00-02.