Reliability calculations for complex systems are difficult. This subject is related to the complexity of the interconnection. Nowadays, various activities are done to promote the aviation industry nationwide, unfortunately, insufficient research has been conducted on the reliability of the missile and aviation industries due to the lack of data and information related to aircraft system failures. As well as anthropogenic errors and related natural and abnormal factors, can occur with fault classification, at different and longtime intervals, with accurate statistical monitoring of events and recorded fault analysis, to check aircraft reliability. To determine the reliability of the bonanza aircraft, the performance of the least five years of operational aircraft in series F-33A & C (PARASTO) should be studied, in which analysis of effective parameters in reliability monitoring, aircraft deployment, and system reliability must be studied. In an organizational analysis system, accurate classification and analysis of defects over long periods and the use of recorded information to assess the reliability of the aircraft have not been accomplished so far. This study considers the importance of aircraft reliability based on the failure mods found in aircraft reliability based on failure modes found in high-risk subsystems and systems, to identify the reliability of each system, and identify faults that lead to reduced reliability and specification. Each System and component compromises aircraft reliability. By improving the reliability, and quantitative and qualitative evaluation of the relevant systems, the quality and safety level of the flights improves with increasing reliability.