Inspect before the feature disappearsInspection gates follow the features that become hidden or inaccessible. A final continuity test does not replace structural inspection.Inspect before the feature disappearsLater testing cannot recreate every earlier observationBefore laminationInner conductor geometry and layer identification.After hole preparationClean, prepared hole walls and exposed copper interfaces.After copper buildLocation-specific copper and interconnect evidence.Before shipmentElectrical result, dimensions and release documentation.At a process changeReview the affected construction and qualification scope.³Ô¹Ïtv · Engineering explanation · Conceptual, not to scale