In the aerospace domain, where the concept of airworthiness and ensuring its continuity is fundamental, securing Engine Control Units (ECUs) is a critical objective to prevent system compromise with potentially catastrophic consequences. This work focuses on the implementation of robust security mechanisms for embedded avionics ECUs by leveraging the advanced hardware security features available on the NXP S32K344 platform, a microcontroller used in both automotive and aerospace applications. By examining this recent Automotive General Purpose ECU, the study demonstrates how embedded system security can be significantly enhanced through the strategic utilization of built-in hardware capabilities. Special emphasis in this work is placed on securing the software image loading process with appropriate verification and authentication and enforcing strict memory protection policies to ensure both the integrity and confidentiality of system data and code exploiting the cryptographic capabilities of the board.