What was found
CAPT AIRSPEED WENT FROM 110KIAS TO 30 KIAS AND STAYED. TAKEOFF REJECTED AT 120KIAS, GROSS WEIGHT 192.8 ALSO "OVERSPEED" WARN INDICATED AND WENT AWAY APPROX 80KIAS. CLACKER ALSO ACTIVATED MOMENTARILY. AIRSPEED ANOMILY OCCURED ON CAPT'S HUD. MX/FLT CREW DEBRIEF, CAPT STATED HE NEVER HAD TIME TO VERIFY/CHECK AIRSPEED DISPLAY ON PFD. BLEW OUT CAPTAIN'S PITOT TUBE, IAW B757AMM 34-11-01-7. REMOVED AND REPLACED L ADC, IAW B757AMM 34-12-01-4. TESTED CAPTAIN PITOT AND STATIC, REF B757AMM 34-11-00-5. PERFORMED AUTOLAND TEST 30/40, REF B757AMM 22-00-02-2. ALL TESTS PASSED, LLM TIMER RESET. SDR NOTE, AIR DATA COMPUTER MFG NAME HONEYWELL, PART AND S/N NOTED ABOVE. NO ACTUAL OVERSPEED OR HIGH ENERGY STOP REPORTED. THIS ITEM CLOSED.