Validation of maintainability prediction

Validation of maintainability prediction techniques was performed. The techniques for preliminary and detailed predictions were applied to three (3) representative samples of electronic equipment. The detailed predictions were then compared with demonstrated field performance on equipments that have in excess of one million system hours of combined operation. The time synthesis prediction technique proved to be a distinct improvement in maintainability prediction methodology over existing techniques. In addition, the time synthesis model provides a structured means of assessing the maintainability design in its early and final stages, thereby determining if the system maintainability requirements will be achieved. The standards for removal and replacement actions were analyzed in detail and modifications recommend.