A B757-200 WAS OPERATED FOR 18 MONTHS WITH INCORRECT THROTTLE PULLEYS IN THE PYLON AREAS DUE TO AN UNCLR AND POORLY WRITTEN ENGINEERING ORDER.

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MY COMPANY INFORMED ME OF A SELF DISCLOSURE REGARDING A POSSIBLE VIOLATION OF FARS (MAINT MANUAL POLICIES) I WAS INVOLVED IN WITH REGARD TO ONE OF OUR ACFT. IN DEC/00; THE WORK WAS AN ENGINEERING ORDER BY ACR PERTAINING TO PULLEYS IN THE THROTTLE SYS ON A B757-200 WITH ROLLS ROYCE RB211-E4 ENGS. THE ENGINEERING ORDER STATED TO IDENT 4 PULLEYS IN EACH PYLON AREA FOR SPECIFIC PART NUMBERS OF PULLEYS AND IF FOUND; THEY WERE TO BE REPLACED. PER ENGINEERING ORDER; 2 PULLEYS WERE FOUND ON R ENG AND WERE REPLACED. 2 WERE NOT REPLACED DUE TO PART NUMBERS NOT MATCHING CRITERIA WRITTEN IN ENGINEERING ORDER AND VERIFIED BY INSPECTION. UPON REINSPECTION JUN/02; THE R ENG WAS FOUND WITH 2 FIBER PULLEYS STILL INSTALLED PER OUR COMPANY POLICIES. REVISED ENGINEERING ORDER NOW STATES THE 4 PULLEYS PART NUMBER 65080977-1 OR BACP 30M4 (THESE ARE PHENOLIC) 'ADDED WORDING ON ENGINEERING ORDER;' MUST BE REMOVED PRIOR TO FURTHER FLT AND REPLACED WITH PULLEY HAVING PART NUMBER 255T1232-7 (ALUMINUM PULLEYS) 'ADDED WORDING ON ENGINEERING ORDER' IN ACCORDANCE WITH MAINT MANUAL AND BOEING SVC BULLETIN B757-76-0015. MY CONTENTION IS THE PAPERWORK I WORKED FROM IN DEC/00 WAS MISLEADING AND UNCLR WITH REGARD TO THE FACT THAT ALL PULLEYS SHOULD BE ALUMINUM REGARDLESS OF PART NUMBER. BOEING SVC BULLETIN WOULD HAVE BEEN MORE CLR IS IT STATED TO CHANGE ALL 8 PULLEYS TO ALUMINUM IF THEY ARE ANYTHING BUT ALUMINUM PART NUMBER 255T1232-7. I BELIEVE THE PAPERWORK (ENGINEERING ORDER) NEEDS TO CLARIFY STEPS TO SAY IF ANYTHING OTHER THAN SPECIFIED PART NUMBERS ARE INSTALLED; CONTACT YOUR SUPVR OR ENGINEERING.