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Lesson One Text 课文： The Classification of Aircraft 飞行器的分类 Although all airplanes are aircraft, not all aircraft are airplanes. An aircraft is any structure 虽说所有的飞机都是飞行器，但不是所有的飞行器都是飞机。飞行器是指通过空气航 that is Intended for navigation through the air and that is supported either by its own buoyancy or 行，由其自身的浮力或者依靠作用在其表面的空气动力支撑的一种结构。 by the dynamic action of the air against its surfaces. A brief look at the various kinds of aircraft is 简单地看一看这些不同种类的航空器，就会对此感到一目了然 in order, since you may fly a number of them during your aviation career and since FAA rules for 的，因为在你的航空生涯中你可能驾驶大量的航空器，而且联邦航空局关于飞行员或飞行员 pilot or airmen certification are based on aircraft classification. The classification begins with 驾驶证的规定也是以航空器的分类为基础的。 分类从种类开始： categories: within a category, specific classes are identified : and within a class, types are 在一种种类中，分为详细的等级：而在一个等级中分为型号。 identified. Category aircraft that use the same method of staying aloft and use similar means of propulsion 种类 利用同一种方法滞留空中和采用类似形式推进力的航空器被归为同一种类。 are grouped into the same category. This is the broadest classification of aircraft. The FAA 这就是航空器最广义的分类。联邦航空局当前认为有四种 currently recognizes the four categories of aircraft shown in Figure 1.1: lighter-than-air, 种类的航空器如图1.1所示： 轻于空气的（航空器） rotorcraft, glider and airplane. 旋翼式航空器，滑翔器和飞机。 Class Within each category，aircraft with similar operating characteristics are grouped into a 等级 在每个种类中，具有类似操纵特性的航空器被分为一个等级， class ，For instance ，within the airplane category there are four classes: single-engine land, 例如，在飞机种类中有四个等级： 单引擎陆地（飞机） single-engine sea, multiengine land, and multiengine sea. 单引擎海上（飞机），多引擎陆地（飞机）和多引擎海上（飞机）。 Type When you refer to a specific make and model of aircraft，you are defining its type. 型号 当你谈及一个明确的牌子和样式的航空器时，你指的是它的型号。 Here are some aircraft types you may be familiar with : Cessna 152，Piper T