As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT TG891 - BTB - DURING TAKEOFF ROLL, F/O'S AIRSPEED INDICATOR DID NOT MOVE AND CAPTAINS AIRSPEED INDICATOR JUMPED FROM 70 TO 80 KNOTS. RETURNED TO BLOCKS AND DURING TROUBLESHOOTING CONFIRMED THAT BOTH AIRSPEED INDICATORS WERE DEFECTIVE. REPLACED CAPTAINS AND F/O'S AIRSPEED INDICATOR P/N A4321710016. PERFORMED PITOT/STATIC TEST AND BOTH SYSTEMS NOW OPERATE NORMAL. (M)