时间：2011-02-23 15:20来源：蓝天飞行翻译 作者：航空 点击：次
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NAVAID /nve.d/ abbreviation navi- gational aid navigation /nv.e..(.)n/ noun the theory and practice of planning, controlling and recording the direction of an aircraft . The basis of air naviga-tion is the triangle of velocities. navigational /nv.e..(.)n.l/ adjective referring to navigation . The accuracy of modern navigational equipment is much greater than older systems. navigational aid /nv.e..(.)n.l e.d/ noun a mechanical or electronic device designed to help a pilot navigate . Any type of navigational aid but par-ticularly electronic aids, for example ADF (automatic direction finding) and 155 never-exceed speed NDBs (non-directional beacons). Abbreviation NAVAID navigational line /nv.e..(.)n.l la.n/ noun same as position line navigation lights /nv.e..(.)n la.ts/ plural noun lights on an aircraft consisting of a red light on the left wing tip, a green light on the right wing tip and a white light on the tail COMMENT: Navigation lights must be used between sunset and sunrise. navigation log /nv.e..(.)n l./ noun written details of headings and times for a flight . The flight crew route flight plan is a composite document which also serves as a navigation log. NDB abbreviation non-directional bea-con necessary /nes.s(.)ri/ adjective needed or essential . A rich mixture is necessary at slow running. . as neces-sary when needed . Warnings, cautions and advisory messages are displayed only when necessary. necessity /n.ses.ti/ noun some-thing that is necessary or very important . Student pilots should understand the necessity for treating thunderstorms with great respect. needle /nid(.)l/ noun a thin metal pointer in an instrument . The needle indicated to zero. needle valve /nid(.)l vlv/ noun a valve formed of a tapered needle pro-jecting into a small opening in a tube, etc., usually connected to a float, which provides fine adjustment of fluid flow . Atmospheric pressure will allow the capsule to expand, causing the needle valve to move into the opening thus reducing the flow of fuel. negative /ne.t.v/ adjective 1. a value of less than 0 . In a reversing pro-peller, the propeller mechanism includes a removable ground fine pitch stop which enables the propeller to be set to a negative pitch. 2. referring to an electric charge of the same sign as that of an electron . the negative terminal of a battery the terminal of a battery marked with the symbol – and normally coloured black rather than red 3. show-ing refusal . a negative answer no 4. showing resistance or non-co-operation . a negative attitude negligible /nel.d.b(.)l/ adjective small or unimportant to the extent that it is not worth considering . Atmospheric attenuation is negligible until the upper end of the UHF (ultra high frequency) band when it increases rapidly. . negli-gible risk almost no risk neoprene /ni.υprin/ noun a type of synthetic rubber |
