<p>This report presents the architectural specification of ACP-CAD-RUNTIME, a minimal engineering engine designed for the structural and functional analysis of mechanical assembly drawings and 3D Computer-Aided Design (CAD) models. The core of the system, ACP_CAD_CORE_V1, is built upon five foundational primitives: OBJECT, INTERFACE, FLOW, CONSTRAINT, and STATE.</p> <p>By adhering to domain separation principles and establishing a causal chain from geometric evidence to synthesized function, the engine provides a structured framework for automated mechanical assembly analysis. This paper outlines the formal axioms, data structures, and the repository architecture intended for standardizing CAD-based functional reasoning.</p> <p><strong>Research Lineage:</strong> Developed as part of Artsybashev's Analysis Method (Version 1) — AAM-V1 research lineage (Identifier: AAM-V1_ARTSYBASHEV_UA_KHARKIV_AIANALYSIS). It is a domain-specific CAD execution-oriented specialization of the broader SOL (Structural Operational Language) framework.</p> This report presents the architectural specification of ACP-CAD-RUNTIME, a minimalengineering engine designed for the structural and functional analysis of mechanicalassembly drawings and 3D Computer-Aided Design (CAD) models. The core of thesystem, ACP_CAD_CORE_V1, is built upon five foundational primitives: OBJECT, INTERFACE, FLOW, CONSTRAINT, and STATE. By adhering to domain separation principlesand establishing a causal chain from geometric evidence to synthesized function, theengine provides a structured framework for automated mechanical assembly analysis.This paper outlines the formal axioms, data structures, and the repository architectureintended for standardizing CAD-based functional reasoning