A B777 RETURNED TO THE FIELD WITH AN ENG PROB DUE TO FUEL NOZZLES INCORRECTLY OVERHAULED BY AN UNQUALIFIED TECHNICIAN.

Narrative

I WAS CHOSEN TO REMOVE AND REPAIR FUEL NOZZLES ON A GE90 ENG IN ACCORDANCE WITH MAINT MANUAL CHAPTER 73. WITHOUT EVER HAVING DONE THIS TASK BEFORE; I TRIED MY BEST TO UNDERSTAND THE MAINT MANUAL AND INSTEAD OF PUTTING ANOTHER MECH ON THE JOB WITH ME THAT HAD PERFORMED THIS TASK BEFORE; I WAS GIVEN SOMEONE THAT WAS IN THE SHOP FOR 2 DAYS. TRYING TO FIND WHAT CORRECT GASKETS TO USE ON THE FUEL NOZZLES WAS VERY DECEPTIVE BY THE ILLUSTRATION IN THE MAINT MANUAL. WHEN I FINALLY HAD A CHANCE TO ASK A MECH WHO HAD PERFORMED NUMEROUS FUEL NOZZLE REMOVE AND REPAIRS; I WAS TOLD BY HIM THAT HE JUST USES THE NUMBERS ON THE GASKETS THAT HE TAKES OFF THE OLD GASKETS. NEEDLESS TO SAY; THE GASKETS THAT I ORDERED AND INSTALLED WERE JUST THE RETAINER PORTIONED GASKET MINUS A C-SEAL; THAT CAN BE ORDERED SEPARATELY; WHICH WAS UNBEKNOWNST TO THE MECHS THAT I SPOKE WITH. THE ACFT HAD AN AIR RETURN AND AN INVESTIGATION IS GOING TO BE PERFORMED. THIS WHOLE INCIDENT COULD HAVE BEEN AVOIDED IF THESE SEALS CAME AS AN ASSEMBLY; AND IF I WAS TRAINED ON THE JOB OR IN A SCHOOL THAT PERTAINS TO THAT ENG OR AT LEAST SOME OTHER MECH THAT COULD INSTRUCT MYSELF THE PROPER WAY THE JOB IS PERFORMED.