## 4 Results and Discussion
### Questionnaire Survey  
This study uses virtual reality technology to evaluate the influence on aviation maintenance. Its assumptions are that (A) there are no other external factors in this study, and students are not affected by emotional and physical stress. (B) The test subjects are not affected by gender. (C) Select the first year students of university with a preliminary concept of aircraft as the research objects. Twenty-six students were invited for a questionnaire survey and asked to fill out the survey before and after the training to perform the walk-around inspection of the Dornier 228 with the AMVR system first. The questionnaire survey consisted of 17 questions into five categories: problem organization, problem analysis ability, problem comment ability, problem-solving ability, and teamwork. The collected data were analyzed using SPSS. The mean and standard deviation were calculated to compute the efficiency of the training. The Cronbach's \(\alpha\)[22] was calculated as Equation (1). The results were used to evaluate the reliability of questionnaire and to make consistency. The results are presented in Table 2.  
\[\alpha=\frac{N\cdot\overline{c}}{\overline{v}+(N-1)\cdot\overline{c}} \tag{1}\]  
where \(N\) is the number of the items, \(\overline{v}\) is the covariance between the item pairs, and \(\overline{c}\) is the average of the variance. \begin{table}
\begin{tabular}{c c c} \hline \hline  & **Number of Questions** & **Cronbach’s \(\alpha\)** \\ \hline Problem Organization & 3 & 0.828 \\ Problem Analysis Ability & 3 & 0.902 \\ Problem Comment Ability & 4 & 0.902 \\ Problem Solving Ability & 4 & 0.897 \\ Teamwork & 3 & 0.916 \\ \hline \hline \end{tabular}
\end{table} 
Table 2: [PERSON]’s \(\alpha\) of the question in the questionnaire survey. Figure 7: Two different UI object in the VR training system. The result shows that the values of [PERSON]'s \(\alpha\) in all the five groups are higher than the minimum value of 0.8 specified by [PERSON] and [PERSON] (2018) for applied research. In the experimental results and investigations of this paper, there should be some comparisons between the controlled group and the experimental group. The experimental group adopts VR technology to discuss aircraft maintenance technology, while the controlled group adopts the general mode (such as traditional teaching or computer digital images) to discuss the aircraft maintenance technology, and the two groups were compared before and after the test. According to the references (2019; 2019; 2020), it is pointed out that the learning effect of using VR technology is more attractive, convenient, and will improve learning efficiency than ordinary computer with digital images. In addition, in terms of 3D stereoscopic experience, VR is able to experience 3D space feeling. It can be integrated into the environment and immersed in three-dimension. These VR operation techniques are just in line with the technology required by the aircraft maintenance system. The method of the controlled group cannot attract students' attention and experience three-dimensional objects. Due to the above reasons, this study does not present the survey of the controlled group, but only conducted a questionnaire survey of the experimental group before and after the test to understand the impact of the use of VR on the aircraft maintenance technology. The problem organization category consisted of 3 questions to assess the students' understanding of the problem. Table 3 and Figure 8 show the statistics of the category. For question 1, the AMVR helped the students find the problems by themselves more easily than the traditional training method, showing an increase in the average score from 3.52 to 4.15. For question 3, the score also increased by 0.68, from 3.59 to 4.27, showing a significant change in the predictability of possible problems with the AMVR system. Besides, the standard deviation of 0.67 also showed high consistency among students.