This paper aims to investigate the fire resistance performance of crucial components in an aero engine, focusing on a representative mounting joint. A streamlined model of the mounting joint is tested using a standardized burner to produce a uniform flame, replicating severe operational environments. Precise measurements are implemented to track and document real-time variations in vital indicators such as surface temperature and strain. The study delves into the characteristics of wall temperature and stress distribution at specific points within the structural elements, considering various flame impact positions, installation techniques, and static loading conditions. The results provide critical insights into the fire performance of the mounting joint, demonstrating significant variations in axial temperature distribution and stress levels under different conditions. These findings furnish data-driven evidence supporting the fireproof airworthiness compliance of the engine’s mounting joint, highlighting the joint’s resilience and stability under extreme conditions.