Abstract: Avionics system for assisting implementation of security measures onboard an aircraft, aircraft comprising such a system, and associated method are provided. The avionics system is intended to assist the occupants of an aircraft in implementing security measures onboard the aircraft. It includes a parameter collector for collecting at least one avionics parameter of the aircraft, a context finder to determine a context from the or each avionics parameter collected by the collector, an instruction identifier to identify at least one relevant security instruction based on the context determined by the context finder, and at least one instruction submitter to submit the or each relevant security instruction to a passenger of the aircraft.