自测试诊断与维修系统 Self-test diagnosis and maintenance system
即维修人员通过观察、听、触摸和简单的测试以及对液压系统的理解，凭经验来判断故障发生的原因。
That is the maintenance personnel through the observation, listen to, touch and simple test as well as to the understanding of the hydraulic system, with experience to judge the cause of the failure.
2007年，宇宙飞船二号飞行器的推进系统在流场测试中于地面爆炸，三名维修工人遇难，另有三名以上人员受伤。
In 2007, the propellant system of a SpaceShipTwo craft exploded on the ground during a flow test, killing three mechanics and injuring three more.
使用测试设备测试电路的连续性，以确保系统的兼容性和安全性，随后进行安装，更换或维修。
Test continuity of circuits using test equipment to ensure compatibility and safety of system, following installation, replacement or repair.
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