What was found
INDICATED AIRSPEED FLUCTUATED +/- 100 KNOTS DURING DESCENT BETWEEN FL240AND FL230. AUTOPILOT DISENGAGED AND AIRCRAFT REVERTED TO ALTERNATE LAW. PITOT PROBE PARTIAL BLOCKAGE. BOTH PITOT PROBES REPLACED AND AIR DATA SYSTEM CHECKED. AIRBUS TECHNICAL FOLLOW-UP (TFU) 34.10.00.001 INDICATES THE POTENTIAL FOR ENVIRONMENTAL CONDITIONS THAT MAY EXCEED THE CERTIFICATION BASIS OF PITOT PROBE (P/N 50620-10). REDESIGNED PROBES (P/N C16195AA) HAVE REPLACED THE OLD INVENTORY AND ARE BEING INSTALLED ON AIRBUS AIRCRAFT ON AN ATTRITION BASIS.