What was found
DURING CLIMB-OUT IN IMC CONDITIONS, THE PAR WARNING ILLUMINATED INDICATING EXCESS AIRSPEED. COPILOT AIRSPEED INDICATOR WAS ABOVE REDLINE. PILOT DECLARED AN EMERGENCY AND RETURNED TO BASE WITHOUT EVENT. MAINTENANCE FOUND NR 2 PITOT HEAT INOPERATIVE AND HAD ICED OVER IN-FLIGHT CAUSING COPILOT AIRSPEED TO INDICATE ABOVE ACTUAL. NR 2 PITOT TUBE WAS REPLACED. STATIC SYSTEM LEAK CHECKED SATISFACTORY. PITOT HEAT SYSTEM FUNCTION CHECK SATISFACTORY. AIRCRAFT RETURNED TO SERVICE. (X)