# Optimizing Aviation Maintenance through Algorithmic Approach of Real-Life Data
## 3 Results
Then, based on the calibration, the nozzle is automatically approached, from which air flows onto the component while the shaft turns the stator or rotor around its axis. In this way, the nozzle maps the entire surface and area of the disc and graphically displays the result in a diagram. Calibration is performed before starting and at the end of the tests to ensure perfect accuracy. A calibration disc is used, on which three errors, two minimal and one significant, are recorded. After the calibration test, the instrument must detectthe errors with absolute accuracy. When errors are detected, they are corrected, which essentially consists of eliminating them by grinding. This test is used to detect the smallest invasive defects that are not visible to the naked eye. The component tested in this way is then thoroughly cleaned, and all colored coatings are removed so that it is ready for the following tests. Paint removal and surface cleaning is performed by sandblasting in closed chambers. The methodology was created as a manual for new technicians in training. We algorithmized this methodology in the form of a flow chart. This methodology is shown in Figure 3.  
This is followed by a penetration fluid test. In the NDT testing, individual components are immersed in a penetration solution designated by the manufacturer specifically for this type of test. After the components are immersed in the penetration solution in silver-plated tubs, they must be fired in a specially designed oven where the solution evaporates or dries. The penetration test, also called the capillary test, is very commonly used as a nondestructive testing method. This type of test is only used with nonporous materials, because with porous materials the test would be unreliable or useless. In this test, the penetrant enters the capillaries of the material by simply inserting itself into the pores of the material. The penetrant test at Roeder Aero uses a fluorescent penetrant solution. A thoroughly cleaned component is immersed in the penetrant solution. After the specified exposure time, which averages 20 min, the excess penetrant is removed and a discharge lamp is inserted. The discharge lamp helps the penetrant to penetrate the capillaries and draw the defect. In this company, a level two to four discharge lamp is used, applying 1000 lux during exposure at 1200 MW/cm\({}^{2}\). The advantage of this test is mainly time saving, but it should be noted that this test can only detect surface defects and imperfections of the tested material. After the penetrant has penetrated the material and revealed defects, the components are inspected in a dark safe room where essentially this entire test takes place. Since the penetrant is fluorescent, the final inspection takes place under UV light where surface defects are easily observed. In this manner, parts of the main wheel assembly are inspected, as well as their subassemblies, such as individual bolts and rods. Figure 2: The stator part **(A)** and rotor part **(B)** of the aircraft wheel assembly (own design). Figure 3: _Cont._  
Figure 3: _Cont_. These individual components are then subjected to a magnetic particle test. Again, this is a nondestructive testing method that can detect both surface and subsurface defects and imperfections. There are several ways to implement this, but in this method ferromagnetic powder is applied to the components and then diodes are applied directly to the material, which is a good tool for the study of the properties of the materials. Figure 3: Designed algorithm for MRO processes (own design), NDT—Nondestructive Testing. using electric current to create a magnetic field in the material. Any imperfections on or under the surface distort the magnetic field in that area and cause magnetic scattering at the interference site. The applied powder and its magnetic particles are attracted to the area of magnetic scattering and then stick to the edges of the irregularity, perfectly highlighting the dimensions of the flaw.