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一年半前,有5家火箭公司竞争发射国际海事卫星-3的头两颗卫星,它们是美国通用动力公司(宇宙神火箭)、欧洲阿里安公司(阿里安火箭)、中国长城公司(长征火箭)、前苏联礼炮局(质子火箭)、日本火箭系统公司(H2火箭)。国际海事卫星组织未接收H2火箭和质子火箭的申请,因为前者的低温级LE-7发动机地面试车几次失败,怀疑它能否在1993年初试射;后者尚未发射过一颗西方制造的卫星,两者是否匹配是个问题。
A year and a half ago, five rocket companies were competing for the launch of the first two satellites of Inmarsat-3, which are American General Dynamics (AOSL), European Allianz (Arian Moon), China Great Wall Company (Long March Rocket), the former Soviet Union Salute Bureau (proton rocket), Japan rocket system company (H2 rocket). Inmarsat did not apply for H2 rockets and proton rockets since the former low-grade LE-7 engine failed ground tests several times and wondered if it could test-fire in early 1993; the latter had not yet fired a satellite manufactured in the West , Whether the two match is a problem.