# Determination of Benefits of the Application of CMMS Database Improvement Proposals
## 3 CMMS Development Problem  
A possible solution to the missing books problem was published in two articles [1; 35], the first [1] showing the preparation of the methodology and the second [35] showing the creation of the maintenance plan.  
Fault Tree Analysis (FTA) [36; 37] is a widely used method for evaluating the reliability of systems [38], which is used either as static or dynamic. The method is also used to analyze fault causes, improve early fault detection, and improve fault diagnosis during engine operation by reducing false conclusions and inappropriate corrective actions [39]. In this part of the study, the method is used to analyze the turbocharger system of marine diesel engines to identify possible faults in the turbocharger system and determine areas (components) that should be serviced. In this study, the faults identified with the FTA analysis are simulated using the Wartsila-Transas 5000 engine room simulator on the propulsion system of the tanker LCC (Aframax) with the main engine MAN B&W 6560 MC-C [40]. The use of the E/R simulator together with the FTA simplifies the preparation of the fault list and allows its verification from different working aspects.  
By combining these two tools, a comprehensive fault list of the turbocharger system of marine diesel engines is created and analyzed in detail. The article [1] once again shows that FTA is extremely useful and practical in analyzing system reliability, energy efficiency, and maintenance costs.  
After making a comprehensive list of the faults of the turbocharger system of a marine diesel engine and analyzing what maintenance work needs to be done to avoid these faults, it was necessary to derive the maintenance schedule for the system from the fault list. Each fault from the FTA list is analyzed, and then appropriate preventive maintenance activitiesare assigned to prevent the occurrence of each fault, resulting in a detailed maintenance plan for the turbocharger system of the marine diesel engine. Several maintenance plans were prepared by the experiment participants (authors of the articles), and each author used his or her own (personal) experience in marine engineering to prepare the maintenance plan.  
These plans were compared and a slight variation was found in the maintenance plans for different tasks. These differences are attributed to the different experiences and practices of the authors [41]. To verify the obtained results, the maintenance plans prepared by the authors using the FTA list were compared with the maintenance instructions for the turbocharger system of the marine diesel engine [42; 43]. The comparison showed that these schedules differ slightly from the manufacturer's maintenance recommendations, but the overall verdict is that they are very similar and the end goal is achieved in both cases.  
The conclusion of this part and the contribution to the overall objective is to show that FTA combined with engineering experience can be a substitute for missing manufacturer's maintenance recommendations when creating the CMMS database. Although the newly created maintenance plan is not the same as the manufacturer's recommended plan, it is very close to it and is a good substitute for it.