What was found
CREW REPORTED- AFTER TAKE-OFF FROM PBI FO’S AIRSPEED INCREASED WITH ALTITUDE AND AT 4000MSL ACTIVATED THE HIGH SPEED WARNING. THE CA & STANDBY AIRSPEED INDICATED NORMALLY. RETURNED FOR LANDING AT PBI, DURING DESCENT THE FO’S AIRSPEED DECREASED TO ZERO ON FINAL APPROACHED.-CORR ACTION- MX COPILOT'S AIRSEED IRRACTIC ON TAKEOFF - TROUBLESHOT, PERFORMED OPERATIONAL/LEAK CHECK OF THE #2 ADC SYSTEM, VERIFIED DISCREPANCY. REMOVED #2 PITOT LINE AND PURGED LINE OF DEBRI, NOTED #2 PITOT WAS CLOGGED. RESECURED #2 ADC PITOT LINE AND PERFORMED OPERATIOANL CHECKS OF THE #2 ADC WTIH NO DEFECTS NOTED.