Safety Requirement Elicitation for Small Aircraft Collision Avoidance Software using STPA, FTA and FMEA

Jongwon Lee, Uicheon Lee, Taehwan Kim, Seonah Lee

http://doi.org/10.5626/JOK.2024.51.8.706

With the growing trend of urban air traffic, aircraft are becoming smaller and more reliant on software. As a result, safety analysis techniques and standards, which have traditionally focused on ARP4761, the aircraft safety evaluation process, must evolve to incorporate a software-centered approach. In this paper, we propose how to link STPA method to FTA and FMEA for safety analysis in air mobility, which is a software-intensive system. To assess the feasibility and effectiveness of this approach, we conducted a safety analysis case study focusing on the collision avoidance software of a small aircraft. The results of the study confirmed the effectiveness of linking STPA, FTA, and FMEA methods and enabled the derivation of safety requirements.