What was found
INSPECTION TYPE:N/A SHORTLY AFTER TAKEOFF LOSS OF ACCURATE AIRSPEED AND ALTITUDE, VERTICAL SPEED, HEADING AND COURSE GUIDANCE. SAI ALL FAIL, YAW DAMP ALL FAIL LEVEL TWO ALERTS ALSO DISPLAYED. NUMEROUS OTHER ALERTS DISPLAYED. COMPLIED WITH ERRATIC AIRSPEED LOSS CHECKLIST AND LANDED. ATB TO ONT. CLEANED DEBRIS FROM NR 1 PITOT TUBE. REPLACED NR 1 CADC PER MM 34-16-01, TEST GOOD. ACCOMPLISHED PITOT STATIC LEAK CHECK PER MM 34-11-00, TEST GOOD.