航空术语词典 Dictionary of Aeronautical Terms 上

时间：2011-03-11 23:11来源：蓝天飞行翻译 作者：admin 点击：次

cross-filing (metal cutting). A method of cutting metal with a file in which the file is moved endwise over the work. Cross-filing is different from draw-filing, in which the file is moved sideways across the work.
cross-firing (reciprocating engine ignition system malfunction). A malfunction in which high voltage in the distributor jumps between the terminals and causes the wrong spark plug to fire.
“Cross [fix] at [altitude]” (air traffic control). A phrase used by ATC when a specific altitude restriction at a specified fix is required.
“Cross [fix] at or above [altitude]” (air traffic control). A phrase used by ATC when an altitude restriction at a specified fix is required. It does not prohibit the aircraft from crossing the fix at a higher altitude than specified; however, the higher altitude must not be one that will violate a succeeding altitude restriction or altitude assignment.
“Cross [fix] at or below [altitude]” (air traffic control). A phrase used by ATC when a maximum crossing altitude at a specific fix is required. It does not prohibit the aircraft from crossing the fix at a lower altitude; however, the aircraft must be at or above the minimum IFR altitude.
cross-flow valve (landing gear system component). An automatic flow-control valve installed between the gear-up and gear-down lines of the landing gear of some large airplanes.
When the landing gear is released from its uplocks, its weight causes it to fall faster than the hydraulic system can supply fluid to the gear-down side of the actuation cylinder. The crossflow valve opens and directs fluid from the gear-up side into the gear-down side. This allows the gear to move down with a smooth motion.
cross-hatching (mechanical drawings). A method of using angled, parallel lines to show that a section of a drawing has been cut away. Different arrangements of the cross-hatch lines are used to identify the material of which the part is made.

cross member (structural component). An auxiliary member of a primary aircraft structure. Cross members are installed between the major lengthwise structural members (longerons and spars) to separate them and to carry stresses other than the primary stresses.
crossover (helicopter rotor system). A condition in which helicopter rotor blades track on the ground and in a hover, but one blade flies higher than the other in flight.
crossover tube (gas turbine engine component). A small tube that connects the burner cans in a multiple-can combustor. Crossover tubes carry flame from one can to the other when the engine is being started.
cross-sectional view (mechanical drawing). An auxiliary view of an aircraft drawing used to show the cross-sectional shape or the construction of part of a structure or component.
cross talk (electronic system). An undesirable condition, also known as cross modulation, in which the output from one system or part of a system is fed over into another system. The output contains the signal that has been fed into it as well as the desired signal.

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