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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The altitude meets IFR obstacle clearance criteria, and it may be lower than the published minimum en route altitude (MEA) along an airway or J-route segment. It may be utilized for radar vectoring only upon the controller’s determination that an adequate radar return is being received from the aircraft being controlled. Charts depicting minimum vectoring altitudes are normally available only to the controllers and not to pilots. Mylar. The registered trade name for a polyester film widely used as an electrical insulator and as a packaging material. Mylar is also used as a film on which high quality ink drawings can be made. Mylar capacitor. A nonelectrolytic capacitor that uses strips of metal foil as the plates and Mylar film as the dielectric. N N1. A symbol representing the rotational speed of the low-pressure compressor in a dual-spool gas turbine engine. In common usage, the low-pressure compressor is often called the N1 compressor. N2. A symbol representing the rotational speed of the high-pressure compressor in a dual-spool gas turbine engine. In common usage, the high-pressure compressor is often called the N2 compressor. N3. A symbol representing the rotational speed of the high-pressure compressor in a triple-spool gas turbine engine. NACA (National Advisory Committee for Aeronautics). This organization was dedicated to the technical development of aviation and was superseded in October of 1958 by NASA, the National Aeronautics and Space Administration. NACA cowling (reciprocating engine cowling). A long-chord ring cowling whose trailing edge fairs smoothly into the fuselage or engine nacelle. NACA cowlings are used on the vast majority of modern radial engine installations. The cooling air rams into the open front of the cowling and exits through an annular slot at the rear. This slot is often covered with adjustable cowl flaps to control the amount of cooling air allowed to flow through the engine. The airfoil shape of the cowling produces a forward aerodynamic force that more than compensates for the cooling drag of the engine. nacelle. An enclosed compartment in an aircraft in which an engine is mounted. Most multiengine propeller-driven airplanes have engine nacelles mounted on the leading edge of the wings far enough out that the propellers clear the fuselage. |
