ISA DEVIATION, The amount of temperature or       與國際標準大氣之偏差，

pressure difference from ISA (see International         溫度或壓力與國際標準大氣的差值（參見國際標準

Standard Atmosphere).                             大氣）。

ISLAND RESERVES, Reserves required by the         島嶼備用油量，

applicable governing agency when flying routes      有關政府單位要求在沒有備降場的島嶼間飛行的飛機

between islands with no alternate airports.       攜帶的備用燃油量。

ISOBARIC CONDITION, Cabin pressure (altitude)     等壓狀況，

remaining constant with changing airplane altitude. 在飛機改變高度時，座艙壓力（即座艙高度）保持不變

                                                  的狀況。

ISOLATION VALVE, A valve in the system for        隔離活門，

separation of the system into sections.             用以將系統分隔成幾個部份的活門。

J

JACK, A mechanical or hydraulic device for raising the 千斤頂，

airplane.                                           用以將飛機抬起的機械式或液壓式的裝置。

JACKING POINT, Location on the airplane for using a 千斤頂支點，

jack.                                               飛機上可以讓千斤頂吃力的位置。

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英漢對照民用航空詞典                              BOEING

JACKSCREW, A rotating threaded rod used to drive a 致動螺桿，

moveable component such as a flap or stabilizer. 用來使可動部件如襟翼或水平安定面運動的能夠旋轉

                                             的螺桿。

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