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美国国防部和航宇局的一个常设技术评审小组已经同意国家空天飞机计划官员继续修改研制计划,推迟单级入轨实验型高超音速飞行器的设计和生产。今年初,计划官员曾建议将计划推迟2年,于2000年左右进行 X-30的首次飞行。被称为3A 阶段计划的该项建议旨在减少近期年度投资,是应付当前财政现实的一个策略。按这个引伸出的3A 阶段计划,在今后几年里,空天飞机(NASP)的年研制经费按1992年美元的不变价格计算,将少于4.5亿美元。计划官员估计1994财年 X-30的经费约需3.5亿美元,1995财年约需4.25亿美元,而计1996
A permanent technical review team of the U.S. Department of Defense and NASA has agreed that National Aerospace Program officials continue to revise the development plan to postpone the design and production of single-stage orbit experimental hypersonic vehicles. Earlier this year, the plan officials had suggested that the plan be postponed for two years and the first flight of the X-30 took place around 2000. Known as the 3A phase of the plan to reduce investment in recent years, this proposal is to cope with the current financial reality of a strategy. According to this extended Phase 3A plan, annual development expenditures for the Space Shuttle Aircraft (NASP) will be less than 450 million U.S. dollars in constant 1992 U.S. dollars. Plan officials estimate that the X-30 funding for fiscal year 1994 will be about $ 350 million, compared with about $ 425 million for fiscal 1995, and 1996