The prediction of the expected number of hours that a system or device will be in an inoperative or “down state” while it is undergoing maintenance is of vital importance to the user & cause of the adverse effect that excessive downtime has on mission success. Therefore, once the operational requirements of a system are fixed, it is imperative that a technique be utilized to predict its maintainability in quantitative terms as early as possible during tic design phase. This prediction should be updated continuously as the design progresses to assure a high probability of compliance with specified requirements. A significant advantage of using a maintainability prediction procedure is that it highlights for the designer, those areas of poor maintainability which justify product improvement, modification, or a change of design. Another useful feature of maintainability prediction is that it permits the user to make an early assessment of whether the predicted downtime. the quality, quantity of personnel, tools and test equipment are adequate and consistent with the needs of system operational requirements.
Replaced/Superseded by document(s)
The purpose of this Maintainability Prediction Handbook is to familiarize project managers and design engineers with current maintainability prediction procedures. To achieve this objective, particular care has been exercised in selecting and including only those procedures which are currently used in predicting the maintainability of equipment and systems. The high- lights of each maintainability prediction procedure are presented m a clear, lucid and intelligible manner and include useful supplementary information applicable to specific procedures, using the following format.