## 1 Introduction  
The evolution of Unmanned Aerial Vehicles (UAVs) is accompanied by instantaneous effects over many industries, thus reflecting a new era of telemetry, efficiency, and safety. At a first glance, agricultural surveying [1] and infrastructure inspection are alleviated by means of modern UAV technologies, hence reducing labor-intensive and risky tasks. From a different perspective, precision agriculture [2] is ameliorated through the sensors and cameras embedded in UAVs. Crop health can hence be better monitored, soil conditions accurately assessed, and resource utilization better optimized, contributing therefore to more sustainable farming practices [3]. Elsewhere, in military applications, UAVs with their highly versatile nature and reliability (i.e., remote control ability, durable flight periods, etc. ), are found to be ideal for reconnaissance [4], border patrol [5], and disaster response [6]. Aside from agricultural- and military-based applications, environmental processes also benefit from UAVs, such that ecosystems can be remotely surveyed [7], wildlife can be dynamically tracked [8], and crucial data for conservation efforts and disaster management can be better gathered [9]. Forwardly, building inspection operations [10] and oil and gas infrastructure monitoring [11] can also be leveraged by means of UAVs for the commercial and industrial sectors [12]. For the part of mapping and surveying applications [13], terrains can be efficiently mapped, construction sites can be better monitored [14], and aid in urban planning [15] can be as well granted with high-resolution cameras and Light Detection And Ranging (LiDAR) sensors embedded in UAVs [16]. The ongoing innovation in UAV technologies, which is mainly based on advances in artificial intelligence [17], communication systems [18], and swarm technology [19], will eventually yield a continuous integration of UAVs into daily lives and industries [20]. It is of no doubt that UAVs are progressively evolving and widespread in diverse fields of application. Despite the significant benefits and remarkable technological advancements associated with UAVs, their highly complex operational landscape implies various failure scenes [21], ranging from performance disruptions to risky mechanical failures [22]. Because of the sensitive hierarchies between the embedded electro-mechanical systems within UAVs, complexities arise from the integration of sensors [23], communication equipment [24], power systems, and others [25]. Firstly, UAVs can experience general system failures that are mainly linked to flight control programs [26]. Hence, maintenance challenges correspondingly emerge to ensure proper functioning. From another part, the inclusion of multiple electro-mechanical components yields increases in both the total weight of the drone and its power consumption, affecting its flight endurance [27]. Moreover, the interconnected system architecture induces a cascading failure effect when one component fails, potentially compromising the entire system [28]. Concerning the mechanical part, UAV's continuous use and exposure to harsh operational conditions contribute to the wear-and-tear effect on different mechanical components [29]. A UAV's structural frame and body can lose integrity, posing catastrophic consequences. Additionally, unavoidable vibrations [30] during flights induce resonance issues, successively leading to accelerated fatigue in the drone's materials. In some applications, UAVs carry payloads, such as drop-off sensors or delivery packages [31], causing issues with their deployment or release mechanisms. Besides mechanical failures, UAVs can be subjected to software bugs and glitches, leading to erroneous behaviors that affect their stability and performance [32]. For example, navigation errors are the result of inaccurate Global Positioning System (GPS) data [33] or misprocessed data in the UAV's navigation algorithm [34], leading to deviations from the intended flight's path.