The difference between Class E and A airspace is that in Class A, all operations are IFR, and pilots must be instrument-rated, that is, skilled and licensed in aircraft instrumentation.

E 级和 A 级空域的区别在于，在 A 级空域，所有操作都需遵照仪表飞行规则，飞行员必须要有仪表等级，也就是说，要有操作航空仪表方面的技术和执照。

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For example, one organization may aspire to be the foremost manufacturer of aircraft instrumentation in North America, while another may want to become a leading global drug distributor.

比如说，这个组织也许追求的是成为北美地区最重要的飞机仪表制造商，而另一家则有可能希望成为领先的全球药品分销商。

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NACTS is a computerized aircraft, threat and target tracking system that is the "great-grandson" of the air Combat Maneuvering Instrumentation system, or ACMI.

NACTS是一个将飞机，威胁和目标跟踪数字化的系统，是空战机动检测系统(acmi)的升级换代产品。

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The Air Accidents Investigation Branch (AAIB) said the aircraft, by modern standards, had "low stability and power margins and poor flight instrumentation".

BBC: Old Warden aerodrome fatal crash