Launch at around 20h10 UTC
2025 04/29 06:16:45来源：新华网Source: Xinhuanet我国成功发射卫星互联网低轨卫星Our country successfully launches satellite internet low-orbit satellites新华社海南文昌4月29日电（郭明芝、崔婉莹）4月29日4时10分，我国在文昌航天发射场使用长征五号乙运载火箭/远征二号上面级，成功将卫星互联网低轨03组卫星发射升空，卫星顺利进入预定轨道，发射任务获得圆满成功。Xinhua News Agency, Wenchang, Hainan, April 29 (Guo Mingzhi, Cui Wanying) At 4:10 on April 29, our country successfully launched the satellite internet low-orbit 03 satellites at the Wenchang Space Launch Center using the Long March 5B carrier rocket/Expedition 2 upper stage. The satellites entered the predetermined orbit smoothly and the launch mission was a complete success.这次任务是长征系列运载火箭的第573次飞行。This mission is the 573rd flight of the Long March series of carrier rockets.
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Drawing extensively on the experience from the Y6 rocket mission, the launch team prioritized addressing risks identified in the previous launch. Adhering to a "rigorous, meticulous, and thorough" approach, they ensured clarity in pre-launch product status, standardized operational procedures during the mission, and strict post-operation quality verification. The technical process system compared physical products with multimedia records and invited relevant designers to conduct on-site, item-by-item confirmations, implementing a "seeing is believing" principle to ensure closed-loop validation of technical status changes.For this mission, the team executed a 42-day-long, instantaneous-window launch process for the first time, significantly compressing the timeline. By optimizing digital tools, they automated critical assembly records retrieval, pre-uploaded quality confirmation templates, and utilized auto-captured system data, drastically reducing the time needed for data compilation and report generation. Operators worked in close coordination, familiarizing themselves with the procedures in advance. In collaboration with system designers, they optimized the launch-day workflow by front-loading certain tasks, mitigating safety risks and quality concerns while paving the way for future crew optimization on launch days. These measures ensured high-quality and efficient completion of launch site tasks despite parallel multi-mission demands.
For this mission, which required an instantaneous-window launch, the Long March 5B test team from the SAST meticulously optimized the pre-launch procedures. They upgraded the booster gas pipe [Pressurisation?] connectors to a plug-and-release mechanism that detaches at T-0 seconds, enhancing separation reliability and ensuring the rocket lifted off precisely on schedule.Additionally, this mission marked the debut of integrally-formed liquid oxygen tank bottoms in the boosters. This advancement shifts the production process from the traditional "segmented forming + component welding" approach to a single-piece integrally forming method. As a result, each booster now has 14 fewer welds, totaling 24 meters in reduced seam length, significantly improving structural reliability. This innovation also lays a solid technical foundation for the Long March 5B's high-frequency, high-intensity launch campaigns in the future.
