Narrative:

I was working with mr X installing a new fan blade in position #4 of the #1 engine on aircraft X. We had only received instruction to install the blade and noted maintenance manual the paperwork previously printed for the job. Using that paperwork we installed the blade and retaining ring. The illustration of the ring installation and the design of the ring caused us to omit a row of securing fasteners. On the engine run and vibration survey excessive vibrations were noted. The relieving crew found the missing bolts when they pulled the spinner to add weights. Our unfamiliarity with the job; although we work the aircraft on through flts; the poor illustration in the MM; poor communication turnover and assuming the last crew had the proper paperwork caused this problem. The additional turnover was spotty and conflicting when presented; one amt received one turnover from the foreman and the other amt received a different turnover from the lead. This added to the confusion to the job. The parts needed to reinstall the ring were not marked for location; nor were they bagged and attached to the part. The fasteners were left in 3 each plastic cups. We assumed; as is the case on a long job; extra bolts had been ordered.callback conversation with reporter acn 787735 revealed the following information: reporter stated the missed fasteners were noted and installed before the aircraft was released for service. Reporter also stated his maintenance department has addressed many of the issues that were raised in order to help prevent a possible reoccurrence.

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Original NASA ASRS Text

Title: TWO MECHANICS DESCRIBE THE CIRCUMSTANCES THAT CONTRIBUTED TO THEIR OMITTING A ROW OF SECURING FASTENERS; WHILE INSTALLING A NEW FAN BLADE AND RETAINING RING ON AN AIRBUS A302 #1 ENGINE.

Narrative: I WAS WORKING WITH MR X INSTALLING A NEW FAN BLADE IN POSITION #4 OF THE #1 ENGINE ON ACFT X. WE HAD ONLY RECEIVED INSTRUCTION TO INSTALL THE BLADE AND NOTED MAINT MANUAL THE PAPERWORK PREVIOUSLY PRINTED FOR THE JOB. USING THAT PAPERWORK WE INSTALLED THE BLADE AND RETAINING RING. THE ILLUSTRATION OF THE RING INSTALLATION AND THE DESIGN OF THE RING CAUSED US TO OMIT A ROW OF SECURING FASTENERS. ON THE ENGINE RUN AND VIBRATION SURVEY EXCESSIVE VIBRATIONS WERE NOTED. THE RELIEVING CREW FOUND THE MISSING BOLTS WHEN THEY PULLED THE SPINNER TO ADD WEIGHTS. OUR UNFAMILIARITY WITH THE JOB; ALTHOUGH WE WORK THE ACFT ON THROUGH FLTS; THE POOR ILLUSTRATION IN THE MM; POOR COM TURNOVER AND ASSUMING THE LAST CREW HAD THE PROPER PAPERWORK CAUSED THIS PROBLEM. THE ADDITIONAL TURNOVER WAS SPOTTY AND CONFLICTING WHEN PRESENTED; ONE AMT RECEIVED ONE TURNOVER FROM THE FOREMAN AND THE OTHER AMT RECEIVED A DIFFERENT TURNOVER FROM THE LEAD. THIS ADDED TO THE CONFUSION TO THE JOB. THE PARTS NEEDED TO REINSTALL THE RING WERE NOT MARKED FOR LOCATION; NOR WERE THEY BAGGED AND ATTACHED TO THE PART. THE FASTENERS WERE LEFT IN 3 EACH PLASTIC CUPS. WE ASSUMED; AS IS THE CASE ON A LONG JOB; EXTRA BOLTS HAD BEEN ORDERED.CALLBACK CONVERSATION WITH RPTR ACN 787735 REVEALED THE FOLLOWING INFO: RPTR STATED THE MISSED FASTENERS WERE NOTED AND INSTALLED BEFORE THE ACFT WAS RELEASED FOR SERVICE. RPTR ALSO STATED HIS MAINT DEPT HAS ADDRESSED MANY OF THE ISSUES THAT WERE RAISED IN ORDER TO HELP PREVENT A POSSIBLE REOCCURRENCE.

Data retrieved from NASA's ASRS site as of May 2009 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.