MBB-BK 117 All Series
Maintenance Airframe; Maintenance Powerplant
Communication Breakdown; Time Pressure; Workload
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Maintenance
General Maintenance Action
Aircraft; Human Factors; Incorrect / Not Installed / Unavailable Part; Procedure
During the track and balance of A/C S/N XXXX; there were issues getting the blades to fly together; blade swapping took place as well as blade replacements.  I was doing the paperwork portion and trusted that the information given to me was correct.  When I was told which S/N's were swapped and which were replaced.  Logbook entries were made and signed off reflecting those actions.  Fast forward a few weeks I was sent an RO (Repair Order) to get unserviceable blades sent out for repair.  I printed out the RO's placed them in the blade boxes and got the blades sent out.  Nowhere in this process did I physically check the S/N's of the blades.  I trusted the mechanics to give me the correct information which was a huge mistake and I should have physically verified the P/N's and S/N's as outlined in our procedures.  This is the end of my statement.Do not rely on others to verify P/N's S/N's. Physically Verify P/N's and S/N's. Double-check other mechanic work to ensure completeness and that what was said was done was actually done. Follow published guidance; policies; and procedures.
Technician reported not verifying part numbers and serial numbers prior to shipping main rotor blades out for repair.