Agusta Undifferentiated or Other Model
Maintenance Inspection Authority
Time Pressure; Workload
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Maintenance; Deviation / Discrepancy - Procedural Published Material / Policy
General Maintenance Action
Aircraft; Incorrect / Not Installed / Unavailable Part; Procedure
The tail rotor control tube was installed and the RII was performed by myself. The aircraft had been in the maintenance hangar since [the beginning for the week] for multiple inspections. After the tube was installed I was asked to complete the RII (Required Inspection Item) and verify the aft side of the tube that connects to the lower lever had proper thread count and bolt was cotter pinned. Then crawled into the tail boom compartment to verify the forward end was connected to the servo verified bolt and cotter pin by hand because visibility cannot accessible without multiple mirrors. Then we performed ops check by actuating tail rotor pedals moving the tube back and forth operation seemed normal. I was not present for when the aircraft was doing ground runs when the aircraft shifted on the ground. I was later notified by my maintenance manager [in the evening] that there was an incident and I would need to write a statement what was my part of the maintenance performed. To avoid this ever happening again a bore scope should be used to see into the compartment that way you can see the side view and be able to tell that it was just not jammed in the bell-crank. Even performing the static check on the ground wasn't enough because the operation felt normal and actuated the tail rotor. After reviewing the maintenance procedures again a step was missed by performing a rigging check there is special tools needed for this step and I was not aware of this step because of the training we had in the hanger it was always taught to match thread count that was so the rigging would not be thrown off. The maintenance procedures need to be followed step by step and reviewed again to make sure a step was not missed.
Technician reported an Agusta-A119 helicopter shifted because the tail rotor was not connected correctly while doing ground runs after maintenance was performed.