时间：2011-03-11 23:18来源：蓝天飞行翻译 作者：航空 点击：次
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time-delay relay (electrical circuit component). A slow-acting electrical relay in which there is a measurable delay between the time current is applied to the relay coil and the time the relay contacts close. A time-delay relay is called a slow-closing or a slow-opening relay. time group (air traffic control). Four digits representing the hours and minutes of Coordinated Universal Time (UTC), based on the 24-hour clock system. In this system, the day begins at 0000 and ends at 2359, and is the time along the prime meridian. The FAA uses UTC for all operations and identifies it as Zulu time, or Z time. For example, 0205Z indicates the reference time of 2:05 a.m. The word “local” or the time zone equivalent is used when local time is given during radio and telephone communications. When written, a time zone designator is used to indicate local time. For example, 0205M is 2:05 a.m. mountain standard time. time in service. 14 CFR Part 1: “With respect to maintenance time records, means the time from the moment an aircraft leaves the surface of the earth until it touches it at the next point of landing.” time-limited part (aircraft maintenance term). An item installed on an aircraft that must be replaced when it has been in service for a specified number of hours. Time-Rite indicator (engine maintenance tool). A patented maintenance tool used to locate the position of the piston in the cylinder of a reciprocating engine. The body of the Time-Rite indicator screws into a spark plug hole and, as the piston moves up in the cylinder, it contacts the indicator arm. A pointer and a scale on the indicator show the number of degrees of crankshaft rotation before top center at which the piston is located. timing disk (engine maintenance tool). A metal disk with a 360° graduated scale marked on its face and a weighted pointer mounted on a bearing in its center. When the disk is clamped onto the end of the propeller shaft of an aircraft reciprocating engine, the pointer points directly upward. The disk rotates with the propeller but the pointer continues to point straight upward and indicates on the scale the number of degrees the shaft has rotated. The timing disk is used with a top-dead-center indicator to position the crankshaft of the engine for valve and ignition timing. timing light. An indicator light used when timing magnetos to indicate when the breaker points open. Some timing lights also incorporate an oscillator or buzzer that changes its pitch when the points open. tin. A lustrous, silvery-white, ductile, malleable, metallic chemical element. Tin’s symbol is Sn, its atomic number is 50, and its atomic weight is 118.69. Tin is used as a plating material for steel (tinplate) and as one of the two major alloys in solder. Soft solder contains between 40% and 60% tin; the rest is lead. |
