2014年5月26日,海射天顶号3SL运载火箭成功将一颗质量约6 t的欧洲通信卫星送入地球同步转移轨道(GTO),此次成功发射标志着该火箭自2013年2月发射失败以来重返商业发射市场。该火箭原定4月15日发射,后因一、二子级级间桁架机械故障而推迟到5月26日。海射天顶号3SL是在天顶号2火箭的基础上发展而来的三 On May 26, 2014, the rooftop Zenith 3SL launch vehicle successfully delivered a European communications satellite of about 6t mass into the Geostationary Transfer Orbit (GTO). The successful launch marked the successful launch of the rocket since February 2013 Launch has failed to return to the commercial launch market. The rocket was originally scheduled to launch on April 15 and was later postponed to May 26 due to mechanical failure of one or two sub-level inter-stage truss machinery. The rooftop 3SL was developed on the basis of the zenith 2 rocket