What was found
ENCOUNTERED SEVERE TURBULENCE AT FL350. GEAR HANDLE PLACED IN THE DOWN POSITION ON FINAL APPROACH AND NOTHING HAPPENED FOR 3-5 SECONDS TEHN THE GEAR EXTENDED NORMALLY. COMPLIED WITH SERVERE TURBULANCE INSP IAW MM 05-50-20 PARA 5. NO DEFECTS FOUND WITH A/C AT THIS TIME. DUPLICATED PROBLEM ON GROUND. TROUBLESHOT & FOUND PROPER ELECTRICAL POWER & GROUND TO LAND GEAR CONTROL VALVE AS WELL AS HYDRAULIC LOADING VALVE. REPLACED LANDING GEAR CONTROL VALVE WITH AN OVERHAULED VALVE PER MM 32-30-02. FOUND LANDING GEAR TO EXTEND & RETRACT PROPERLY 10 TIMES IN A ROW PER MM 32-30-00. LEAK CHECKED GOOD. HYD RESERVOIR SERVICED TO FULL.