Historical information

Description: SUPERSEDES RTCA 9-48/DO-9, PUBLISHED 16/2/1948 AND RTCA 10-48/DO-10, PUBLISHED 17/2/1948. 91 pages. Published by Radio Technical Commission for Aeronautics. Published 12/5/1948. D629.132 RAD. General Introduction to Air Traffic Control Level of Importance: World.