Circular 26. Издание 1. Terrain Clearance and Vertical Separation of Aircraft

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Circular 26. Издание 1

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Terrain Clearance and Vertical Separation of Aircraft

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ICAO Circular 26 1st Edition -1953 Cover Page Missing

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ICAO Circular 26-/23 3 TERRAIN CLEARANCE AND VERTICAL SEPARATION OF AIRCRAFT INTRODUCTION 1. This circular describes a method for assessing the height of an aircraft above the terrain during all stages of a flight and for ensuring adequate vertical separation of aircraft during flight while en route. This method, which was developed for world-wide application and is now in use in most areas of the world, is the product of several years study by three technical divisions of the Air Navigation Commission of ICAO and various regional air navigation meetings. It was developed with a view to eliminating the hazards created by the use of several different methods in various parts of the world and to facilitate international aircraft operations in general by introducing standard procedures . 2, The basic purpose of this circular is to assist national administrations, its various departments and operators in applying the relevant procedures which have been published in Part I of ICAO document 7030. It contains a somewhat detailed discussion of the principles on which this method is based but in the interest of brevity it does not attempt to cover the various other methods which were discussed at length during the development of the method described. 3. Bearing in mind that this circular may be found useful as a general reference on the subject of I1altimeter settingf1 by readers ranging from those having little knowledge of the subject to those quite familiar with the method described, the material has been arranged in such a way as to facilitate reference to discussion of any one of the several aspects of this rather involved subject. The principal part of the circular is only concerned with a description of the method detailed discussions of the several associated subjects will be found in appendices. Examples illustrating one or more of the subjects discussed will be found in attachments to this circular . TERMINOLOGY 4. Early discussions in ICAO of altimeters and their various uses indicated that several terms commonly used in such discussions were being assigned quite different meanings and that the meaning of such terms varied from one country to another. Accordingly, prior to undertaking an examination of existing methods or to developing a world-wide method, it became evident that standard definitions of such basic terms as ffheightff "altitudew and ffelevationu would be required. The following definitions were adopted for use in all ICAO documents and are found in the ICAO Lexicon of Terms Doc 7200.

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