provides the major portion of engine thrust.

FAN (NO. 2), A device consisting of one or more          风扇（NQ．2），

revolving blades attached to a rotary hub and operated     安装在由马达驱动的旋转轮壳上的一片或多片旋转桨

by a motor. Fans are usually used to provide cooling or  叶所组成的装置。通常用来提供冷却或空气循环。

air circulation.

FAN AIR, The portion of airflow through a turbofan       风扇气流，

engine which passes only through the fan.                  在涡轮风扇发动机中，仅仅通过风扇的那部分气流。

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英汉对照民用航空词典                                     BOEING

FAN COWL, A covering around the fan section of the    风扇整流罩，

engine that can be opened for access to the             在发动机风扇周围的可卸盖壳，打开后可以够到发动

components on the engine.                             机部件。

FASTENER, A mechanical device such as a bolt, nail,   紧固件，

rivet or screw that is used to tie two objects together. 用来将两个物体连接起来的机械装置。如螺栓，钉子，

                                                      铆钉，或螺钉。

FATIGUE OR FATIGUE FAILURE, The failure of a          疲劳或疲劳断裂，

material because of bending, flexing or severe vibration 因弯曲或剧烈振动力所造成的材料断裂。

forces.

FAULT ISOLATION MANUAL (FIM), A manual which          故障隔离手册 （FIM），

contains procedures for isolating and correcting        内含隔离并排除飞机故障程序的手册。供航空公司维修

reported airplane faults. Used by airline mechanics.  机械员使用。

FAULT REPORTING MANUAL (FRM), A manual used           故障报告手册（FRM），

by flight crews to aid in reporting airplane system     机组使用的一本手册。用以帮助他们报告飞机系统的故

malfunctions.                                         障。

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