Technician reported mis rigging the Aileron Trim System on a C560XL after removing the central pedestal to facilitate other repairs. The flight crew ferrying the aircraft out of maintenance reported excessive aileron trim was required and performed an air turn back.

Narrative

On Date; Aircraft X; a Citation 560XL came to Company X for scheduled maintenance. I was tasked to perform the Inspection Document 1. On this inspection it was required to remove the nose landing gear actuator panel for a corrosion inspection. While trying to remove the panel found several screws were free spinning. After further investigation it was found that 36 screws were installed that were too long and damaged the dome nuts that resided in the pressure vessel. In order to gain access to the dome nuts it was required to remove the center pedestal. This included the trim wheel for the aileron. Before removal; the trim was zeroed and the connecting rod was marked as such. The repair took 2 weeks to complete. Upon closing up the trim tab was verified to still be at zero but the connecting rod was now not reaching the rod from the wheel. I requested assistance from another technician that was not involved in the job to help line up the rods. He was able to get them to reach each other and left me to finish the job. At this time; I did not realize the trim tab was no longer at zero even though the marked index lines matched up in the cockpit. I proceeded with the install and RTS (Return To Service) paperwork. Company Y (the operator); took the airplane out for a reposition flight on Date1 and the crew experienced excessive aileron trim was required and returned to the FBO (ZZZ). I was called out to investigate the next day and realized the trim indication did not match the trim tab. Performed the required rigging and once again released the airplane. As of today Date2 the airplane has completed a successful test fight and issue is resolved.