见Inoperative．

INOPERATIVE, Not working or operating.                   不工作，

                                                           不工作或无法进行操纵。

INSTRUMENT FLIGHT RULES (IFR), Rules governing           仪表飞行规则（IFR），

the procedures for conducting instrument flight. Also a    仪表飞行程序所需遵守的规则。

term used by pilots and controllers to indicate type of

flight plan.

INSTRUMENT LANDING SYSTEM, A precision                   仪表着陆系统，

instrument approach system which normally consists of      一种精密仪表进近系统。一般由航向道信号接收机，下

the following airplane components: localizer receiver,   滑道信号接收机，和指点信标接收机所组成。

glide slope receiver, and marker beacon receiver.

INSTRUMENT METEOROLOGICAL CONDITIONS                     仪表飞行气象条件（IMC），

(IMC), Meteorological conditions expressed in terms of     以能见度，与云的距离，和云幕高低于最小规定的目视

visibility, distance from cloud, and ceiling less than the 气象条件的一种气象状态的表达。

minimums specified for visual meteorological

conditions.

INSTRUMENT RUNWAY, A runway equipped with                仪表跑道，

electronic and visual navigation aids for which a          用于以精密或非精密进近程序作订明最低天气标准直

precision or nonprecision approach procedure having      线着陆的装备有电子和目视助航设备的跑道。

straight-in landing minimums have been established.

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INTEGRAL TANK, A metal container formed by the           整体油箱，

wing structure (spars, ribs, skin) for storage of fuel on   由机翼结构件（梁、肋、蒙皮）组成，用来在飞机上

the airplane.                                            储存燃油的金属容器。