## 1 Introduction
These devices represent a low-priced option with many advantageous features; mainly, they are quite lightweight and have the possibility to be equipped with various accessories. In addition, precise spatial control with fast responding and the ability to perform vertical take-off and landing with hovering mode make these devices an ideal option for object tracking tasks [16]. These new technologies have come a long way in reaching their current capabilities which allow them to be used in manufactories and aircraft maintenance. Unfortunately, the widespread utilization is still limited, which is mainly due to regulations and certification processes, for which adaptation is a long-term matter. To achieve the highest levels of safety related with applications of new technologies, their relevant legislation has to be correctly adjusted. This area is covered by national and European legislation [17; 18]. On the other hand, a growing market could have a significant impact on improving legislation and creating appropriate rules for their inclusion [19]. The use of UAVs in performing visual inspection of aircraft could prove its application, especially for several reasons: saving time, reducing the workload of technical personnel, increasing personnel safety, detecting not only mechanical but also potentially structural damage of the aircraft. At present, UAVs do not have to be equipped with an ordinary camera but also with a sufficiently sensitive longwave infrared (IR) thermal camera capable of identifying defects inside the composite materials of the aircraft (e.g., delaminations, cracks) and failures of electronic components of an aircraft systems. Crack detection is vital for aircraft engine maintenance. [PERSON] et al. [20] developed an automatic crack detection system for engine combustion chamber components as an alternative to fluorescent penetrant inspection (FPI). The system uses robot-controlled white light interferometry (WLI) to digitize the entire surface of a component. Then, the resulting reference points in three-dimensional space, drawn in high resolution, are used for automatic crack detection. The results of measurements and image processing need additional manual evaluation to identify faulty positive results in the dataset. The edges of the recorded cracks are compared with the predefined surfaces of the components in a digital model, where they are distinguished from scratches. At present, we find an increasing use of composite materials in various aircraft constructions. However, as their use increases, so does the number of damage cases that can occur either during the production phase or during operational processes. Examples of such damage are barely visible impact damage (BVID), delamination, and the rupture of matrix fibers. Inspections performed by non-destructive testing (NDT) methods are used to detect said damages and defects in composite materials [21]. It is important to mention that innovative inspection techniques are in demand [22]. As the industry focuses on the Industry 4.0 concept, certified maintenance organizations (MROs) and Continuing Airworthiness Management Organizations (CAMOs) must make progress in the usage of \"Smart Technologies\" [23]. RFID is an automated identification technology that uses radio frequency waves to transfer data between a reader and items that have RFID devices, or tags, affixed. The tags contain a microchip and antenna and operate at internationally recognized standard frequencies. These devices do not work only as identification; in addition, they can store the information about the item for tracking and maintenance purposes. Unlike the bar codes, RFID tags could be read without direct visual contact; furthermore, multiple tags can be read at the same time by RFID readers. Their main benefit is that they could be attached to both external and internal surfaces. This is the reason why RFID tagsfind their application in aviation maintenance processes.