时间：2011-03-11 23:13来源：蓝天飞行翻译 作者：admin 点击：次
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A condition similar to brake fading occurs when there is an internal leak in the brake master cylinder. The brakes are applied, but as the pedal is held down, fluid leaks past the piston, and the brakes slowly release. FAF (final approach fix) (air traffic control). The fix from which the final approach (IFR) to an airport is executed and which identifies the beginning of the final approach segment. An FAF is designated on government charts by the Maltese cross symbol for nonprecision approaches and the lightning bolt symbol for precision approaches. When ATC directs a lower-than-published glideslope/path intercept altitude, it is the resultant actual point of the glideslope/path intercept. Fahnstock clip (electrical connector). A type of spring clip used to temporarily connect a wire into an electrical circuit. Some batteries have Fahnstock clips for connecting wires to their terminals. Fahrenheit temperature. Temperature measured on a scale that uses 32° as the point at which pure water freezes, and 212° as the point at which pure water boils under standard atmospheric pressure. There are 180 equal graduations between the freezing and boiling points of water. Absolute zero (the point at which molecular motion stops) is –460°F. fail-hardover (automatic flight control malfunction). A type of failure of an automatic flight control system that produces a steady signal which drives the controls to the extreme end of their travel and holds them there. Hardover failure can result in a crash, and to prevent it, automatic flight control systems have some method of releasing or overpowering the control if such a condition occurs. fail-safe control. A type of control that automatically puts the controlled device in a safe condition if the control system should fail. faired curve. A smooth curve that has no sharp changes in its direction. fairing. A part of a structure or machine whose primary purpose is to produce a smooth surface or a smooth junction where two surfaces join. fairlead (aircraft control system). A plastic or wooden guide used to prevent a steel control cable from rubbing against an aircraft structure. fall wind (meteorology). A cold wind blowing downslope. Fall wind differs from a foehn (See foehn) in that the air is initially cold enough to remain relatively cold despite the heating from the compression it received during its descent. false rib (airplane structural component). A short, partial rib used in a truss-type airplane wing to improve the shape of the leading edge of the airfoil. False ribs, also known as nose ribs, extend back only as far as the front spar. false spar. A short, partial wing spar behind the rear spar, used to support the aileron hinges. false start (gas turbine engine operation). A condition in which the fuel-air mixture inside a gas turbine engine ignites and burns, but the RPM does not build up high enough for the engine to continue to run without help from the starter. A false start, also called a hung start, is caused by the starter not turning the engine fast enough for it to start properly. |
