During the 2002 Atlantis flight, a piece of insulation broke off and damaged the left solid rocket booster but did not impede the mission or the programme.

亚特兰蒂斯号2002年在执行飞行任务的过程中，一橡胶密封圈破裂，左固体火箭助推器受损，好在当时没有防障任务的执行或影响飞行计划的完成。

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Technologies being tested in the program include advanced guidance, navigation and control, thermal protection systems, avionics, high temperature structures and seals, conformal reusable insulation, lightweight electromechanical flight systems, and autonomous orbital flight, reentry and landing.

ENGADGET: USAF relaunches its first X-37B on a slightly less mysterious spaceflight

The company has to conduct battery- and insulation-related pre-flight inspections, watch battery behavior like a hawk, use only its own pilots and fly over unpopulated areas.

ENGADGET