时间：2011-03-11 23:11来源：蓝天飞行翻译 作者：admin 点击：次
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clearance (physical clearance). The distance or space between moving parts that allows free movement. clearance limit (air traffic control). The fix, point, or location to which an aircraft is cleared when issued an air traffic clearance. “Clearance void if not off by (time)” (air traffic control). A phrase used by ATC to advise an aircraft that the departure clearance is automatically canceled if takeoff is not made prior to a specific time. The pilot must obtain a new clearance or cancel his IFR flight plan if not off by the specified time. clearance volume (reciprocating engine measurement). The volume of the cylinder of a reciprocating engine when the piston is at the top of its stroke. “Cleared as filed” (air traffic control). A statement meaning the aircraft is cleared to proceed in accordance with the route of flight filed in the flight plan. “Cleared for (type of) approach” (air traffic control). ATC authorization for an aircraft to execute a specific instrument approach to an airport. “Cleared for approach” (air traffic control). ATC authorization for an aircraft to execute any standard or special instrument approach for that airport. “Cleared for takeoff” (air traffic control). ATC authorization for an aircraft to depart. This clearance is based on known traffic and known physical airport conditions. “Cleared for the option” (air traffic control). ATC authorization for an aircraft to make a touch-and-go, low approach, missed approach, stop-and-go, or full-stop landing at the discretion of the pilot. This clearance is normally used in flight training, to allow the instructor to evaluate the student’s performance under changing situations. “Cleared through” (air traffic control). ATC authorization for an aircraft to make intermediate stops at specified airports without refiling a flight plan while en route to the clearance limit. “Cleared to land” (air traffic control). ATC authorization for an aircraft to land. This clearance is based on known traffic and known physical airport conditions. clear ice (meteorology). Transparent ice that forms on an aircraft in smooth layers when the aircraft is flying through freezing rain or supercooled clouds. Clear ice, also called glaze ice, forms fastest when the drops of water are large, such as those found in cumuloform clouds. clearing an engine (gas turbine engine operation). The act of clearing combustible gases from the inside of a gas turbine engine after an aborted start. The engine is rotated with the starter so the compressor can force fresh air through the engine and carry all the dangerous vapors out the tail pipe. clearway. 14 CFR Part 1: “(1) For turbine engine powered airplanes certificated after August 29, 1959, an area beyond the runway, not less than 500 feet wide, centrally located about the extended centerline of the runway, and under the control of the airport authorities. The clearway is expressed in terms of a clearway plane, extending from the end of the runway with an upward slope not exceeding 1.25 percent, above which no object nor any terrain protrudes. However, threshold lights may protrude above the plane if their height above the end of the runway is 26 inches or less and they are located to each side of the runway. |
