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Circular 26
Terrain Clearance and Vertical Separation of Aircraft (Altimeter Setting)
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ICAO CIRCULAR 26-/23 Second Edition - 1956 CIRCULAR TERRAIN CLEARANCE AND VERTICAL SEPARATION OF AIRCRAFT ALTIMETER SETTING Prepared by the Secretariat and published by authority of the Secretary General INTERNATIONAL CIVIL AVIATION ORGANIZATION MONTREAL CANADA
This Publication is issued in English, French and Spanish. Published in Montreal, Canada, by the International Civil Aviation Organization. Correspondence concerning publications should be addressed to the Secretary General of ICAOI International Aviation Building, 1080 University Street, Montreal, Canada. Orders for ICAO publications should be sent, on payment In Canadian currency 1, to Secretary General, ICAO, International Aviation Building, 1080 University Street, Montreal, Canada. Cable address ICAO MONTREAL In French currency fr, to ICAO Representative, ro ean and African Office, it , avenue d'I6na, Paris 16e, France. Cable address ICAOREP PARIS In Peruvian currency soles, to ICAO Representative, south American Office, Apartado 680, Lima, PerG, able address ICAOREP LIMA A In Australian currency s/d, to Robertson and Mullens, 107 Elizabeth Street, 'Melbourne, C. 1, Australia. I In Sterling or Irish currency s/d, to Her Majesty's Stationery Office, P.O. Box 569, London, S.E. 1, England. Cable address WHOLECORN, SEDIST, LONDON In Eayptian currency L. E., to ICAO Representative, Middle East Office, Wadie Saad Building, Sharia Salah el Dine, Zamalek, Cairo, Egypt. Cable address ICAOREP CAIRO In Thai currency bahts, to ICAO Representative, Far East and Pacific Office, Sala Santitham, Rajadamnoen Ave., Bangkok, Thailand. Cable address ICAOREP BANGKOK In Indian currency Rs,, to Oxford Book and Statianery Company. Scindia House, New Delhi, India. In Argentine currency from Editorial Sudamericana S. A. , Calle Alsina 500, Buenos Aires, Argentina. Cable address LIBRECOL
TEKHAlN CLEAHANCE AND VERTICAL SEP.4RA'I'ION ----------- ------- - -. OF AIR CRAF'I Second Edition - 1956 This edition of Circular 26-/23, which 'supersedes the 1953 edition, contains several editorial amendments and amendments to para- graphs 20 to 26 inclusive resulting from the work of the Second Air Navigation Conference September 1955.
2 ICAO Circular 26-AN/23 TABLE OF CONTENTS Page Introduction .................................................... 3 Terminology ..................................................... 3 Development and use of an altimeter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Basic principles of the ICAO Method for ,ensuring adequate Terrain Clearance and Vertical Separation.. . . . . . . . . . . . . . . . . . . . . . . 6 Use of QNH Altimeter Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Use of QFE Altimeter Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Flight Level's .................................................... 9 Application of the Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 APPENDICES Appendix A. - The calibration of an altimeter errors due to variations in atmospheric pressure the derivation of a QFE and a QNH altimeter setting. . . . . . . . 19 AppendixB.- The StandardAtmosphere .,.......................... 29 Appendix C. - Variations of Pressure and Temperature from those of the Standard Atmosphere A discussion of variations in atmospheric pressure and temperature at a particular point and its effect upon the indications provided by an altimeter and upon the vertical position of flight levels . . . . . . . . . . . . 37 Appendix D. - The Q-Signals Associated with Altimeter Setting.. . . . . . . 43
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Table Of Contents
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TABLE OF CONTENTS