What was found
ON CLIMB-OUT, V2 120 KTS ON LT SIDE, RT SIDE SHOWED 20 KTS LWR. AS ALT INCREASED, A/S DIFFERENTIAL INCREASED AND EPR DECREASED SIGNIFICANTLY, FL 310 A/S ON RT SHOWED 400 KTS PLUS AND MACH O/S WARN SOUNDED. ALL OTHER GAUGES SHOWED NORM, INCLUDING PILOTS A/S IND. ON DESCENT A/S DIFFERENTIAL DECREASED AND EPR STARTED TO SHOW NORM. A/C RETURNED. NO EMERG PROCEDURES NECESSARY. FOUND FOREIGN OBJECT IN PITOT DRAIN BLOCK FROM RT PITOT TUBE. REMOVED ALL DEBRIS, PRESS CHK'D AND LEAK CHK'D RT PITOT/STATIC SYS IAW FALCON MM 34-10-1. OP CHK'D MACH O/S WARN SYS IAW FALCON MM 34-10-4 WITH NO DEFECTS NOTED. PERFORMED PWR ASSURANCE RUN OF BOTH ENG'S IAW FALCON 20 MX INSPECT PROCEDURES MANUAL W/NO DEFECTS NOTED. (M)