Recently, the China Manned Space Agency disclosed details regarding the in-orbit repair of a minor crack found on the porthole of the Shenzhou-20 spacecraft. The crack—less than 0.1 millimeters wide—was discovered by astronauts during a routine cabin inspection near the edge of the reentry module’s window, in a non-critical area, and posed no threat to flight safety. Ground control promptly convened an expert team for risk assessment and guided the crew to apply a specially formulated transparent sealant. This material offers high optical clarity, radiation resistance, and thermal stability, ensuring structural integrity in extreme space conditions. The entire repair procedure, carried out collaboratively by two astronauts, took approximately 40 minutes and was streamed live to mission control via the space-to-ground communication system. Subsequent monitoring confirmed the sealed area remained stable, with both airtightness and optical performance meeting required standards. This incident not only demonstrated Chinese astronauts’ capability in on-orbit emergency response but also highlighted the mission’s safety philosophy of ‘prevention first, rapid response.’ Experts noted that such micro-cracks likely result from minor impacts by micrometeoroids or orbital debris—a common challenge in long-duration human spaceflight—but current protective and repair protocols are fully capable of managing these risks.
近日，中国载人航天工程办公室披露了神舟二十号飞船在轨运行期间舷窗出现微小裂纹的维修细节。据悉，该裂纹是在例行舱内巡检中由航天员发现的，位于返回舱舷窗边缘非关键区域，宽度不足0.1毫米，未对飞行安全构成威胁。地面控制中心迅速组织专家团队进行风险评估，并指导航天员使用特制透明密封胶进行临时封堵。该材料具备高透光性、耐辐射和热稳定性，可在极端太空环境中维持结构完整性。整个操作过程耗时约40分钟，由两名航天员协同完成，全程通过天地通信系统实时回传画面。经后续监测，封堵区域状态稳定，气密性和光学性能均符合标准。此次事件不仅验证了我国航天员在轨应急处置能力，也体现了空间站任务中‘预防为主、快速响应’的安全管理理念。专家指出，微小裂纹可能源于微流星体或空间碎片的轻微撞击，此类情况在长期载人飞行中难以完全避免，但现有防护与修复机制已足够应对。
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