What was found
DURING CRUISE FLIGHT AUTOPILOT CONNECTED RECEIVED STALL INDICATION (STICKSHAKER) AND RED IAS. IAS ON BOTH AIRSPEED TAPE READ APPROX 280KTS. STANBY AIRSPEED WAS 220 KTS. ACCOMPLISHED ERRACTIC AIRSPEED CHECKLIST AND FADEC ALT. CDG U PERFORMED STICK SHAKER ACTIVATION INSPECTION IAW MM05-51-12-6,FOUND NO DAMAGE ON ELEVATORS. CDG U CHECKED PITOTS AND PITOTS DRAIN HOLES FOR OBSTRUCTIONS. FOUND SATIS. PERFORMED PITOT STATIC SYS FUNCTIONAL CHECK IAW AMM 34-11-00-2. FOUND ALL INDICATIONS SATISFACTORY. PRECAUTIONARY R & R ADC NR1 IAW AMM 34-16-01-4. CHECKED FCC NR 1 & NR 2 FOR CURRENT FAULTS. NO FAULTS. ACFT OK TO CONTINUE. CDG U R/I FROM FACT PREMATURE REMOVAL/INSTALLATION. FINAL CLOSED.