A FALCON 10C WAS DISPATCHED WITH THE FUSELAGE FUEL FEEDER TANK IMPROPER REPAIRED.

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WHILE ASSIGNED TO A 48 MONTH INSPECTION ON A HAWKER 600; I ENCOUNTERED A WORK STOPPAGE FOR PARTS AND TO FACILITATE OTHER MAINT. WHILE AT THIS WORK STOPPAGE; I WAS ASSIGNED TO ASSIST ON A 'C' CHK INSPECTION ON A FALCON 10 SERIAL XXXX; CARD CODE XYZ. LATER THAT MORNING; HAWKER PARTS AND EQUIP CAME IN WHICH REQUIRED THAT I RETURN TO THE 48 MONTH INSPECTION ON THE HAWKER 600. I BAGGED AND TAGGED ALL HARDWARE; PROBES; ELECTRICAL BOXES; AND PANELS. ALL REMOVED PARTS AND PANELS WERE STORED; AND THE TECHNICIAN WAS GIVEN A COMPLETE TURNOVER AS TO WHAT HAD BEEN DONE; MY STOPPING POINT; AND WHY I WAS STOPPING. DAYS LATER; I WAS ASKED TO RE-INSTALL THE PROBES AND ELECTRICAL BOXES. I WAS ASSURED THAT THE OP HAD BEEN COMPLETED AND INSPECTED. IN GOOD FAITH; I RE-INSTALLED THE PROBES AND ELECTRICAL BOXES AND SIGNED OFF THE CARD. ON SEP/XA/97 I WAS INFORMED THAT SOME SMALL CORROSION WAS DISCOVERED IN THE FEEDER TANK DURING ANOTHER INSPECTION AT A DIFFERENT LOCATION. I TRAVELED TO THE LOCATION AND INSPECTED THE FEEDER TANK AND VERIFIED A SMALL SPOT OF CORROSION EXISTED ON THE FORWARD L-HAND CORNER OF THE R FEEDER TANK. FROM THIS OCCURRENCE I'VE LEARNED THAT GOOD FAITH AND ASSURANCES HAVE THEIR PLACE; BUT NOT IN ACFT MAINT. I'VE ALWAYS DOUBLE-CHKED ALL MAINT AND COMPLETED ALL TASKS ASSIGNED. I WILL CONTINUE TO DOUBLE-CHK MY WORK AND NOT BE ASSURED OR ASSUME ANYTHING UNLESS I'VE PERSONALLY CHKED AND VERIFIED THE MAINT MYSELF.