Doc 4444-RAC/501/10 Corrigendum No. 1 2/10/72 PROCEDURES for AIR NAVIGATION SERVICES RULES OF THE AIR and AIR TRAFFIC SERVICES TENTH EDITION - 1970 CORRIGENDUM No. 1 English version only Page 3-15, paragraph 14.1, Note,third line from bottom of page Delete the sentence However, unless otherwise prescribed by the appropriate authority a controlled VFR flight would not constitute essential traffic to other controlled VFR flights.