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Tanker Setbacks

机译：油轮挫折

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Although Boeing will begin 2018 hoping to put months of technical challenges, schedule delays and cost overruns behind it, the company's KC-46 Pegasus tanker program again fell short in 2017.In December Boeing finally acknowledged what the U.S. Air Force has long projected-that it will not begin delivering the long-anticipated tanker until 2018. Costs continue to rise, with Boeing taking an additional $329 million charge related to KC-46 development in the third quarter of 2017, on top of the more than $2 billion incurred since 2014.Even more concerning was the news in September that the Air Force had identified three major deficiencies related to the refueling process that require resolution before the KC-46 can be used operationally. The two most worrying issues involved the tanker's rigid refueling boom: un-commanded boom extensions when disconnecting from a receiver aircraft with fuel flowing, and a tendency of the boom to scrape the surface of receiving aircraft. The second problem could be of particular concern for stealth aircraft, such as the B-2 bomber, F-22 or F-35 fighters, if the boom causes damage to low-observable stealth coatings.
机译：尽管波音公司将在2018年开始，希望能解决数月的技术挑战，时间表延误和成本超支的问题，但该公司的KC-46飞马空中加油机计划在2017年又一次落空.12月，波音公司终于承认了美国空军长期以来的预期-直到2018年，波音公司才开始交付备受期待的油轮。成本继续上升，波音公司在2017年第三季度额外收取了与KC-46开发相关的3.29亿美元费用，这是自2014年以来产生的超过20亿美元的费用更令人担忧的是，9月有消息称，空军发现了与加油过程有关的三个主要缺陷，需要在KC-46投入使用之前加以解决。最令人担忧的两个问题涉及加油机的刚性加油臂：当燃料流与接收飞机断开连接时，不受控制的臂架延伸，以及臂架刮擦接收飞机表面的趋势。如果动臂对低可观察到的隐形涂层造成破坏，那么第二个问题可能是隐形飞机（例如B-2轰炸机，F-22或F-35战斗机）特别需要关注的问题。

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