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Purpose In the past decades, both civil and military applications of small unmanned aerial systems (sUASs) have been on the rise. The sUASs guarantee the performance of dangerous, dull, duly and dirty missions, according to the 4D rule. The purpose of this study is to describe, some ethical, operational and safety challenges occur owing to the use of sUASs at over-crowded areas or in emergency scenarios. After an overview of the current sUAS regulations, some strategic configuration elements will be analysed to improve these systems and to define safe and inoffensive sUASs. Nevertheless, some problems have not been completely overcome. Design/methodology/approach The unmanned vehicles are nowadays applied for different kinds of applications. Search and rescue (S&R) missions; terrain surveillance and monitoring after natural disasters, such as earthquakes and landslides; and transportation of medical equipment and cartography are some examples of the most renowned and important civil missions of sUAS. In all these scenarios, some challenges could be encountered. First, the use of sUASs could compromise the privacy of unaware citizens who are in the area of application. Moreover, even if the unmanned vehicle works according to national and international regulations, there are some hazards both for the ground operators and for the population, because these sUASs could impact the human body after a flight failure. Findings In this paper, current principal regulations will be analysed, identifying some differences and discrepancies among them. Moreover, some considerations about the configuration elements are introduced to define the safe use of sUASs. Nevertheless, the privacy challenge is quite complicated to be overcome definitely. Originality/value Considering some challenges related to the civil applications of sUASs, new unmanned configurations could be developed to guarantee safety and data protection of unaware people.

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