What was found
AFTER ROTATION, CREW NOTICED A LOSS OF AIRSPEED INDICATION ON THE PILOT`S INDICATOR ONLY. FLAP OVERSPEED LIGHT ILLUMINATED. ALSO THE AUTOPILOT AND YAW DAMPENER WOULD NOT ENGAGE. TROUBLESHOOTING POINTED TO A LACK OF AIRSPEED INDICATION FROM THE LT SIDE AIR DATA COMPUTER. THE PITOT TUBE AND ASSOCIATED TUBING WERE CLEARED OF DEBRIS. A PITOT/STATIC CHECK WAS PERFORMED WITH NO ABNORMALITIES NOTED. OPERATION OF ALL ASSOCIATED SYSTEMS WERE NORMAL. AC WAS RELEASED FOR FLIGHT.