ICAO CIRCULAR 1 I-AN11 0 CIRCULAR - - r m I DECEMBER 1949 AERODROME OBSTRUCTION CHARTS INTERNATIONAL CIVIL AVIATION ORGANIZATION MONTREAL a CANADA Prepared in the Air Navigation Bureau and published by authority of the Secretary General 
This publication is issued in English, French aisi' 3panish Published in Montreal, Canada, by the International Cvil Avi.ation Oraaniaation. Correspondence concerning publications should be addressed to the Secretary General of ICAO, International Aviation Building, 1080 University Street, Kontrsal, Canada, Orders for ICAO publications should be sent, on papent In Canadian currency 1, to - In Sterlin or Irish currency s/dr, to Secretary General, ICAO, Eiis blajesty" Stationery Office, International Aviation Building, P.O. Box 569, 1080 University Street, London, S.E. 1, Elontreal, Canada. England. Cable address ICAO MONTREAL  Cable address mSTONEIiY LONDOEI  In French currency fr., to In Epyptian currency dmA, to ICAO Representative, ICAO Representative, E Q ean  African Office, Niddle East Off ice, 6F1', avenue d IQna, 10 Sharia Lotfallah, Apartment 7, Paris 16e, France. Zamaleli, Cable address  ICBOFP PLARIS  Cairo, Egypt. Cable address ICBOWP CAIRO In Peruvian currency soles, to In Australian currency s/d 1, to ICAO Representative, ICaO Representative, South American Office, Far East  Pacific Office, Apartado 680, 17 Kobe Street, Lima, Pert. St. Hilda, Cable address  ICAOIZEP LDIA  Melbourne, Australia. Cable address ICAOREP MELiiOiiKiJEj . Price  10 cents Canadian currency ontreal 
ICBO Circular 12-ANh0 Page 3. 'T TABLE OF CONTENTS Page Foreword .........................................,,............. INSTRUCTIONS FOR OBSTRUCTION PLAN SURVEYS 1.- General Discussion .......................................... 2.- Horizontal Control Surveys ...,.............................. 3.- Leveling .................................................... 4.- Selection of Obstructions ................................... 5.- Determination of Elevation and Location of Obstructions ..... 6.- Field Computations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Plate 1.- Obstruction Plan - Survey Areas ................. Plate 2.- Obstruction Plan - Vertical Sections ............ United States Specimen Plans.- 1 Obstruction Plan - n0P-9 Palm Beach International Airport, Floridau. Reduced copy 2 Obstruction Plan - "OP-543 Needles Airport, Californian. Reduced copy . . . . . . . . . . . . . . . . . . . Notes and Abbreviations pertinent to the Specimen Plans ... 
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