What was found
ON MARCH 30, 1998 DURING CRUISE FLIGHT, NR 2 FUEL FILTER LIGHT CAME ON. PILOT TURNED A/C TO RETURN TO BASE. APPROXIMATELY 5 MINUTES LATER, THE NR 1 FUEL FILTER LIGHT ILLUMINATED. LANDED IN THE DESERT ONE MILE SOUTH OF WITTMAN, AZ. MAINTENANCE SAMPLED FUEL, REPLACED FILTER ELEMENTS. NO ABNORMALITIES NOTED. REPLACED NR 1 ENGINE FUEL FILTER ASSY AND FUEL PUMP. SUSPECT ROOT CAUSE WAS MOISTURE IN BOTH ENGINE FUEL FILTER SWITCHES. (THERE HAD BEEN RECORD RAINFALL IN THE PRECEDING DAYS).