时间：2011-08-28 11:47来源：蓝天飞行翻译 作者：航空 点击：次
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Class B airspace. Airspace from the surface to 10,000 feet MSL surrounding the nation’s busiest airports in terms of IFR operations or passenger numbers. The con. guration of each Class B airspace is individually tailored and consists of a surface area and two or more layers, and is designed to contain all published instrument procedures once an aircraft enters the airspace. For all aircraft, an ATC clearance is required to operate in the area, and aircraft so cleared receive separation services within the airspace. Class C airspace. Airspace from the surface to 4,000 feet above the airport elevation (charted in MSL) surrounding those airports having an operational control tower, serviced by radar approach control, and having a certain number of IFR operations or passenger numbers. Although the con. guration of each Class C airspace area is individually tailored, the airspace usually consists of a 5 NM radius core surface area that extends from the surface up to 4,000 feet above the airport elevation, and a 10 NM radius shelf area that extends from 1,200 feet to 4,000 feet above the airport elevation. Class D airspace. Airspace from the surface to 2,500 feet above the airport elevation (charted in MSL) surrounding those airports that have an operational control tower. The con.guration of each Class D airspace area is individually tailored, and when instrument procedures are published, the airspace is normally designed to contain the procedures. Class E airspace. Airspace that is not Class A, Class B, Class C, or Class D, and is controlled airspace. Class G airspace. Airspace that is uncontrolled, except when associated with a temporary control tower, and has not been designated as Class A, Class B, Class C, Class D, or Class E airspace. Clean configuration. A con.guration in which all . ight control surfaces have been placed to create minimum drag. In most aircraft this means .aps and gear retracted. Clearance. ATC permission for an aircraft to proceed under speci. ed traf.c conditions within controlled airspace, for the purpose of providing separation between known aircraft. Clearance delivery. Control tower position responsible for transmitting departure clearances to IFR . ights. Clearance limit. The .x, point, or location to which an aircraft is cleared when issued an air traf. c clearance. Clearance on request. An IFR clearance not yet received after .ling a . ight plan. Clearance void time. Used by ATC, the time at which the departure clearance is automatically canceled if takeoff has not been made. The pilot must obtain a new clearance or cancel the IFR .ight plan if not off by the speci. ed time. Clear ice. Glossy, clear, or translucent ice formed by the relatively slow freezing of large, supercooled water droplets. Compass course. A true course corrected for variation and deviation errors. Compass locator. A low-power, low- or medium-frequency (L/MF) radio beacon installed at the site of the outer or middle marker of an ILS. |
