ATLAS ITk Pixel Inner System Loaded Local Supports: Pre-production QA/QC and Production Plans

The LHC Phase II high-Luminosity upgrade will substantially increase collision rates and radiation levels, requiring replacement of the ATLAS Inner Detector with an all-silicon Inner Tracker (ITk) offering faster readout, reduced material budget, and improved radiation tolerance. The ITk comprises more than 5 billion readout channels with five pixel layers near the interaction point and four microstrip layers at larger radii. The pixel region is further divided into the Inner System (IS) near the beampipe and the Outer Rings and Outer Barrel. The IS geometry comprises a barrel with two layers of flat staves and two symmetric endcaps formed from three ring layers. Staves and rings are built from pixel modules mounted on carbon-fiber supports and fitted with power and data pigtails and cooling infrastructure, forming a Loaded Local Support (LLS). This contribution presents the challenges, successes, and current status of the pixel-IS LLS QA/QC testing, focusing on pre-production experiences and plans for production.