Secure avionics equipment and associated method of making secure

Electronic equipment comprising:

• a processor (2) programmed to execute a critical function as defined in a predetermined avionics specification,
• a memory (11) and a communications module (3) ensuring an interface with an avionic data network, wherein the communications module (3) and the processor (2) are on board a microcontroller (1) such that the memory (11) is shared between the processor and the communications module, and
• a common bus (12) linking the processor (2) and the communications module (3) to the memory (11), said common bus (12) being shared between the processor (2) and the communications module (3),
• a surveillance module (17) for access to the memory (11) through the common bus (12), said surveillance module being configured to detect access of the communications module (3) in a non-authorised address zone of the memory (11).