|37000 Feet||Browse and search NASA's
Aviation Safety Reporting System
|Local Time Of Day||1801 To 2400|
|Locale Reference||airport : zzz.airport|
|Altitude||agl single value : 0|
|Operator||common carrier : air carrier|
|Make Model Name||EMB ERJ 135 ER&LR|
|Operating Under FAR Part||Part 121|
|Affiliation||company : air carrier|
|Function||maintenance : technician|
|Affiliation||company : air carrier|
|Function||oversight : supervisor|
|Anomaly||aircraft equipment problem : less severe|
maintenance problem : improper documentation
maintenance problem : improper maintenance
non adherence : far
non adherence : published procedure
|Independent Detector||other other : 2|
|Resolutory Action||none taken : detected after the fact|
|Maintenance||performance deficiency : non compliance with legal requirements|
|Problem Areas||Maintenance Human Performance|
|Primary Problem||Maintenance Human Performance|
I was assigned to work on aircraft X for the MEL 27-9; flap low speed problem. Fixing this MEL is unfamiliar to me and I had to learn about the flap system. With the help of my lead mechanic; I troubleshot and found that flap electronic control unit was inoperative. I went to parts department and installed a new flap electronic control unit on aircraft X. However; during the operations check of the flap system with the new flap electronic control unit; the test failed. I did more research and discovered that the new flap electronic control unit was a repaired component with a long history of fault items. I returned the new flap electronic control unit back to parts department as bad from stock. Then; I was told by parts clerk that there were no more flap electronic control units available in ZZZ. At this point; my lead mechanic suggested that I take a flap electronic control unit from aircraft Y and slave it to aircraft X to verify the flap electronic control unit was bad from stock. I did as what my lead mechanic suggested and the operations check was good. Once we identified that the flap electronic control unit was a problem; we aog for another flap electronic control unit. After that; I removed the flap electronic control unit from aircraft X and reinstalled the flap electronic control unit back to the original aircraft (Y); and the operations test was good. Since we had to wait for another flap electronic control unit; I documented what I did on the back of the non-routine work card on aircraft X. However; I was overwhelmed by working on this MEL that I forgot to generate the non-routine work card on aircraft Y stating that I removed flap electronic control unit for troubleshooting purposes. I realize that I made a mistake in not following gpm procedure. I was told by a shift supervisor when I came into work after I did the work. Since this was a drop dead MEL on aircraft X and I was unfamiliar with this task; I overlooked paperwork that needed to be generated on aircraft Y. In addition; I was being distracted by the unclear reference manual on emb-135. I had to do extra research to make sure that the part number was an ok part to be used on aircraft X. With the help of my lead mechanic we found out that flap electronic control unit part number was a good part. If I'm assigned unfamiliar tasks in the future; I will also ask my lead mechanic to pair me up with someone who has experience with the tasks assigned.
Original NASA ASRS Text
Title: MECHANIC IS INFORMED HE FAILED TO GENERATE A WRITE-UP FOR REMOVING AN FECU UNIT FROM ONE EMB-135LR ACFT FOR TROUBLESHOOTING ON ANOTHER EMB-135LR; WITH A DEFERRED MEL FLAP LOW SPEED PROBLEM.
Narrative: I WAS ASSIGNED TO WORK ON ACFT X FOR THE MEL 27-9; FLAP LOW SPD PROB. FIXING THIS MEL IS UNFAMILIAR TO ME AND I HAD TO LEARN ABOUT THE FLAP SYS. WITH THE HELP OF MY LEAD MECH; I TROUBLESHOT AND FOUND THAT FLAP ELECTRONIC CTL UNIT WAS INOP. I WENT TO PARTS DEPT AND INSTALLED A NEW FLAP ELECTRONIC CTL UNIT ON ACFT X. HOWEVER; DURING THE OPS CHK OF THE FLAP SYS WITH THE NEW FLAP ELECTRONIC CTL UNIT; THE TEST FAILED. I DID MORE RESEARCH AND DISCOVERED THAT THE NEW FLAP ELECTRONIC CTL UNIT WAS A REPAIRED COMPONENT WITH A LONG HISTORY OF FAULT ITEMS. I RETURNED THE NEW FLAP ELECTRONIC CTL UNIT BACK TO PARTS DEPT AS BAD FROM STOCK. THEN; I WAS TOLD BY PARTS CLERK THAT THERE WERE NO MORE FLAP ELECTRONIC CTL UNITS AVAILABLE IN ZZZ. AT THIS POINT; MY LEAD MECH SUGGESTED THAT I TAKE A FLAP ELECTRONIC CTL UNIT FROM ACFT Y AND SLAVE IT TO ACFT X TO VERIFY THE FLAP ELECTRONIC CTL UNIT WAS BAD FROM STOCK. I DID AS WHAT MY LEAD MECH SUGGESTED AND THE OPS CHK WAS GOOD. ONCE WE IDENTIFIED THAT THE FLAP ELECTRONIC CTL UNIT WAS A PROB; WE AOG FOR ANOTHER FLAP ELECTRONIC CTL UNIT. AFTER THAT; I REMOVED THE FLAP ELECTRONIC CTL UNIT FROM ACFT X AND REINSTALLED THE FLAP ELECTRONIC CTL UNIT BACK TO THE ORIGINAL ACFT (Y); AND THE OPS TEST WAS GOOD. SINCE WE HAD TO WAIT FOR ANOTHER FLAP ELECTRONIC CTL UNIT; I DOCUMENTED WHAT I DID ON THE BACK OF THE NON-ROUTINE WORK CARD ON ACFT X. HOWEVER; I WAS OVERWHELMED BY WORKING ON THIS MEL THAT I FORGOT TO GENERATE THE NON-ROUTINE WORK CARD ON ACFT Y STATING THAT I REMOVED FLAP ELECTRONIC CTL UNIT FOR TROUBLESHOOTING PURPOSES. I REALIZE THAT I MADE A MISTAKE IN NOT FOLLOWING GPM PROC. I WAS TOLD BY A SHIFT SUPVR WHEN I CAME INTO WORK AFTER I DID THE WORK. SINCE THIS WAS A DROP DEAD MEL ON ACFT X AND I WAS UNFAMILIAR WITH THIS TASK; I OVERLOOKED PAPERWORK THAT NEEDED TO BE GENERATED ON ACFT Y. IN ADDITION; I WAS BEING DISTRACTED BY THE UNCLEAR REFERENCE MANUAL ON EMB-135. I HAD TO DO EXTRA RESEARCH TO MAKE SURE THAT THE PART NUMBER WAS AN OK PART TO BE USED ON ACFT X. WITH THE HELP OF MY LEAD MECH WE FOUND OUT THAT FLAP ELECTRONIC CTL UNIT PART NUMBER WAS A GOOD PART. IF I'M ASSIGNED UNFAMILIAR TASKS IN THE FUTURE; I WILL ALSO ASK MY LEAD MECH TO PAIR ME UP WITH SOMEONE WHO HAS EXPERIENCE WITH THE TASKS ASSIGNED.
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.