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INERTIAL REFERENCE SYSTEM, A self-contained,           慣性基準系統，

navigational system based on the measurement of          以測量飛機的加速和姿態為基礎的獨立導航系統。

acceleration and attitude.

INFLIGHT PERFORMANCE, The performance of the           空中性能，

aircraft while enroute.                                  飛行中飛機的性能。

INITIAL APPROACH FIX (IAF), The fix which identifies   起始進近定位點（IAF），

the beginning of the approach to an airport.             標志向著陸機場進近開始的定位點。

INLET GUIDE VANES, A fixed set of blades in front of   進口導向葉片，

an engine compressor for directing airflow to the        發動機壓氣機前的一組固定葉片，用以引導氣流進人壓

compressor.                                            氣機。

INNER LOOP CONTROL, For autopilot operation this is    內環路控制，

the basis control of airplane pitch and roll attitude    對于自動駕駛儀操作，這是無關飛行航道的飛機俯仰姿

without regard to flight path.                         態和坡度的基本控制。

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INNER MARKER, A marker beacon located between            近指點標，

the middle marker and the end of the ILS runway.           位于盲降跑道頭和中臺之間的信標臺。

INOP, SEE - INOPERATIVE                                  不工作的，