Narrative:

During track and balance of aircraft X; it was determined a main rotor (M/right) blade was needed. Mechanic I was working with and I removed blade and replaced with the same part number we removed. We finished track and balance and accumulated 0.3 flight time while completing the job. Upon return to the hangar to remove tracking equipment quality assurance (mechanic) informed us that we installed the wrong part number.we reviewed the paperwork from both blades and determined it was not an upgraded blade that was installed. To upgrade the blade a service bulletin needed complied with installing upgraded dampeners. We installed the upgraded dampeners on the blade in question and corrected paperwork to reflect the change to the blade. The aircraft was then placed back in service.it was found that the removed blade was not properly identified; as per the service bulletin; to reflect it was an upgraded blade. The service bulletin states that a line will be drawn through the last two digits of the part number. In this case it would have been the number xy. Further; the number xz will be written in permanent marker next to the lined out number. The removed blade did not have a line through the last two digits and the xz was not legible.

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Original NASA ASRS Text

Title: A Maintenance Technician reported that during track and balance on a EC-135 helicopter; a main rotor blade was needed. They upgraded the existing blade per a Service Bulletin.

Narrative: During Track and balance of Aircraft X; it was determined a Main Rotor (M/R) blade was needed. Mechanic I was working with and I removed blade and replaced with the same part number we removed. We finished track and balance and accumulated 0.3 flight time while completing the job. Upon return to the hangar to remove tracking equipment Quality Assurance (Mechanic) informed us that we installed the wrong Part Number.We reviewed the paperwork from both blades and determined it was not an upgraded blade that was installed. To upgrade the blade a Service Bulletin needed complied with installing upgraded dampeners. We installed the upgraded dampeners on the blade in question and corrected paperwork to reflect the change to the blade. The aircraft was then placed back in service.It was found that the removed blade was not properly identified; as per the Service Bulletin; to reflect it was an upgraded blade. The Service Bulletin states that a line will be drawn through the last two digits of the part number. In this case it would have been the number XY. Further; the number XZ will be written in permanent marker next to the lined out number. The removed blade did not have a line through the last two digits and the XZ was not legible.

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.