Research on the evaluation index of maintainability of manned spacecraft on-orbit

The main target of equipment layout in manned spacecraft is to build a safe and comfortable circumstance for astronauts. By discussing the effects of space environment to maintainability design of manned spacecraft, the evaluation index was proposed based on the difference between on-orbit maintenance and ground maintenance. According to the maintainability design principles and engineering practice, the evaluation index system was completed for the manned spacecraft, which was constituted by the evaluation index and the method of evaluation.