見Inoperative．

INOPERATIVE, Not working or operating.                   不工作，

                                                           不工作或無法進行操縱。

INSTRUMENT FLIGHT RULES (IFR), Rules governing           儀表飛行規則（IFR），

the procedures for conducting instrument flight. Also a    儀表飛行程序所需遵守的規則。

term used by pilots and controllers to indicate type of

flight plan.

INSTRUMENT LANDING SYSTEM, A precision                   儀表著陸系統，

instrument approach system which normally consists of      一種精密儀表進近系統。一般由航向道信號接收機，下

the following airplane components: localizer receiver,   滑道信號接收機，和指點信標接收機所組成。

glide slope receiver, and marker beacon receiver.

INSTRUMENT METEOROLOGICAL CONDITIONS                     儀表飛行氣象條件（IMC），

(IMC), Meteorological conditions expressed in terms of     以能見度，與云的距離，和云幕高低于最小規定的目視

visibility, distance from cloud, and ceiling less than the 氣象條件的一種氣象狀態的表達。

minimums specified for visual meteorological

conditions.

INSTRUMENT RUNWAY, A runway equipped with                儀表跑道，

electronic and visual navigation aids for which a          用于以精密或非精密進近程序作訂明最低天氣標準直

precision or nonprecision approach procedure having      線著陸的裝備有電子和目視助航設備的跑道。

straight-in landing minimums have been established.

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INTEGRAL TANK, A metal container formed by the           整體油箱，

wing structure (spars, ribs, skin) for storage of fuel on   由機翼結構件（梁、肋、蒙皮）組成，用來在飛機上

the airplane.                                            儲存燃油的金屬容器。