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Doc 8400. Edition 2
Amendment No. 4
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Doc 840012 Amendment No. 4 4/C1/68 AMENDMENT NO. 4 TO THE PROCEDURES for AIR NAVIGATION SERVICES ICAO ABBREVIATIONS AND CODES INTERNATIONAL CIVIL AVIATION ORGANIZATION
Check-list of Amendments to Doc 8400-PANS-ABC Second Edition incorporating Amendments 1, 2 and 3. Amendment No. 4 approved by the Air Navigation Commissicn on 4 April 1968. Replacement pages - Foreword, page 0-6 Decode, pages 1-1 to 1-8 Encode, pages 2-1 to 2-8, and 3-1 Preface to Q Code, page 9-1. 1 Date of Applicability 8/2/68 4/4/68 1
AMENDMENT No. 4 to the Procedures for Air Navigation Services ICAO ABBREVIATIONS AND CODES To give effect to Amendment No. 4 to the PANS-ABC, please 1. Enter the amendment on page 2. 2. Replace the followirig pages by new pages attached, as follows a Foreword - page 06. b Abbreviations DECODE - pages 1-1 to 1-8 c Abbreviations ENCODE - pages 2-1 to 2-8 d Abbreviations for Identifying Fixed Service Messages - pages 3-1 and 3-2 e The Q Code Preface - page 9-1.
Foreuord ---- Doc 84001 2 0-5 FOREWORD 1. Introduction This document contains abbreviations and codes approved by the Council of ICAO for world-wide use in the international aeronautical telecommunication service and in aeronautical information documents, as appropriate, with the status of Procedures for Air Navigation Services in abbreviated form the PANS-ABC. This document is the outgrowth of study by the Air Navigation Commission in consultation with States in the matter of controlling and co-ordinating abbreviations and codes. It brings together all abbreviations and codes for use in aircraft operations with the following exceptions a Designators of Aircraft Operating Agencies, Aeronautical Authorities and Services promulgated in Doc 8585. b Aeronautical meteorological figure codes given in Attachment A of Annex 3 - Meteorology. c dditional abbreviations for restricted use in AIS documents given in the Aeronautical Information Services Manual Doc 8126-AN/872. d Location Indicators given in Doc 7910. e Aircraft Type Designators given in Doc 8643. 2. Principles for Formulation of Abbreviations The principles applied in the formulation of ICAO abbreviations are a that allocation of more than one signification to a single abbreviation sh6uld be avoided except where it can be reasonably determined that no instances of misinterpretation would arise b that allocation of more than one abbreviation to the same signification should be avoided even though a different use is prescribed c that abbreviations should make use of the root word or words and should be derived from words common to the three working languages except that where it is impracticable to apply this principle to'best advantage, the abbre- viation should follow the English text d that the use of a singular or plural form for the signification of an.abbre- viation should be selected on the basis of the more common use e that an abbreviation may represent grammatical variants of the basic signi- fication where such application can be made without risk of confusion and the desired grammatical form can be determined from the context of the message. With respect to the latter principle, several variants are given for a number of abbreviations where it might not be obvious that the variant is appropriate or acceptable.
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