A situationally aware cockpit door locking system for mitigating internal threat scenarios in commercial aviation

This study proposes a situationally aware conditional access mechanism for cockpit doors, designed to mitigate intentional harmful actions by a pilot when alone in the cockpit. The proposed logic functions as a software-based decision layer integrated with existing flight management and door locking systems. It enables the use of a randomly generated emergency code only when two conditions are simultaneously met: (i) at least one pilot is absent from the cockpit, and (ii) a certified emergency warning (stall, EGPWS, or excessive pitch/roll) is active. This design ensures that cockpit access is granted not based on speculative predictions of pilot intent, but on objective, certified indicators that the aircraft has exited its safe operational envelope. A physical prototype was developed to demonstrate the feasibility of the proposed logic, and tests confirmed that the system behaves consistently and repeatably under defined emergency scenarios. The proposed system does not interfere with flight control or pilot authority; rather, it provides a human-centered, intermediate safety layer between static security measures and fully autonomous intervention approaches, addressing a critical gap in current cockpit security architecture.