The approach assessing lower (upper) limits of maintainability, MTTR, maximum repair time and median repair time are presented, when the repair time obeys the exponential distribution, (log) normal distribution.

• 对维修时间服从指数、正态、对数正态分布的情况,本文给出了评定维修性、MTTR、最大维修时间、中位维修时间的置信上(下)限方法。