A maintainability analysis provides calculated information regarding various aspects of maintenance. The goal is to determine the amount of time required to perform repairs and maintenance tasks so that you can predict how long a repair will take when a system failure occurs. You can base your predictions on generic maintenance procedures. You can also base them on procedures 2, 5A, and 5B in MIL-HDBK-472, Military Standardization Handbook Maintainability Prediction.

During analysis, all common maintainability parameters are calculated, including MTTR, which is the mean time to repair removable items in the system for corrective maintenance. More importantly, you can use MTTR in a reliability prediction to calculate availability, which is the probability that an item is in an operable state at any time. Availability is based on a combination of failure rate and MTTR. Because Windchill Risk and Reliability integrates the Maintainability and Prediction modules, you can easily run these calculations. For more information, see Windchill Maintainability.