Aspen's EFD1000 retrofit PFD has been an industry changer on many fronts. Part of that includes stealing the pole position for the most desirable HSI upgrade/replacement on the market. For years the Bendix/King KCS55A was front and center setting the benchmark for which all other systems were measured. With the huge success of the Aspen, the used market has become saturated with removed KCS55As that are getting tossed on the surplus equipment shelves. Hunt the pages of eBay, Controller or used avionics wholesale houses and you'll find plenty of removed KCS55As for $2000-3000, sometimes less if they have an "as removed, as is" status.
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机译：Aspen的EFD1000改造PFD已在许多方面改变了行业。其中的一部分包括抢占市场上最理想的HSI升级/替换的标杆。多年来，Bendix / King KCS55A一直处于领先地位，并为所有其他系统的测量设定了基准。随着阿斯彭（Aspen）的巨大成功，二手市场已经被淘汰的KCS55A所饱和，这些KCS55A被扔在多余的设备架上。搜寻eBay，Controller或二手航空电子设备批发商的页面，您会发现很多被拆下的KCS55A售价为2000-3000美元，有时如果它们处于“原样被拆下”状态，则价格会更低。
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