Narrative:

One problem was the pilot did not put on the collective lock; the aircraft lifted again and had a hard landing seconds later.I had removed the dual controls and installed them again; and then removed them again.this was not familiar to me; I had been to a school for EC130's; but this was the first time working on an EC130 by myself. I found I only used part of the electronic manual and not all of it; because of my unfamiliarity with it. I missed the part of balancing the controls by putting the one end of the balancing spring in another position. I thought I had finished the maintenance properly. I found out later I did not via the tech rep. The spring tension/position may have been a factor in the aircraft becoming airborne and then landing again hard.I see where I could have done a better job; but I had difficulty with both the tech manual site and electronic tech manuals due to my inexperience. I also had asked my company bosses for more training before the helicopter arrived. I was also working at night and was tired. Just from being up at night. I usually work days.

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Original NASA ASRS Text

Title: A Helicopter Maintenance Technician reported that the balancing spring for the duel controls was not in the proper position.

Narrative: One problem was the pilot did not put on the collective lock; the aircraft lifted again and had a hard landing seconds later.I had removed the dual controls and installed them again; and then removed them again.This was not familiar to me; I had been to a school for EC130's; but this was the first time working on an EC130 by myself. I found I only used part of the electronic manual and not all of it; because of my unfamiliarity with it. I missed the part of balancing the controls by putting the one end of the balancing spring in another position. I thought I had finished the maintenance properly. I found out later I did not via the tech rep. The spring tension/position may have been a factor in the aircraft becoming airborne and then landing again hard.I see where I could have done a better job; but I had difficulty with both the tech manual site and electronic tech manuals due to my inexperience. I also had asked my company bosses for more training before the helicopter arrived. I was also working at night and was tired. Just from being up at night. I usually work days.

Data retrieved from NASA's ASRS site 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.