Comparison of Methods for the Safety Evaluation of UAS Operation

Abstract

The focus of this paper is to compare methods for safety evaluation of specific UAS operations. The UAS domain is constantly evolving and with this development comes new types of operation that have no analogy in the past. The core of UAS operation, like of the entire aviation industry, is achieving an acceptable level of safety, for which a specific operations risk assessment method, known by SORA, has been developed. SORA is a ten steps method designed for use by safety amateurs, which means that some generalization had to be done in its development. On the other hand, current state-of-the-art safety methods are systemic, which helps with the complexity of aviation operations these days. The goal of this paper is to compare SORA methodology with STPA and FRAM applied to specific complex UAS operations and to find safety gaps when applying SORA. The results identified system requirements that are not currently addressed and may have a negative impact on the safety of UAS operations.

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