Original ICAO Bulletin, Volume 25, Number 7, dated July 1970, published by the International Civil Aviation Organization in Montreal. This issue is devoted principally to air traffic services, communications, civil avionics, navigation systems and air traffic control.

The cover photograph shows air traffic controllers working in the control tower at Washington National Airport.

Contents include The Systems Approach to Civil Avionics by R. J. Lees, H. G. R. Robinson and Dr T. S. Moss of the Royal Aircraft Establishment at Farnborough; Automation of Aeromobile Telecommunication Services; Japan Names New Representative to ICAO Council; The Multi-National Public Corporation: Aviation’s Answer to International Cooperation? by Charles O. Cary; Report on the 5th North Atlantic Meeting; and Air Traffic Services: A Glance at the Past and a Projection of the Future by Jacques de Vienne.

The civil avionics article includes photographs and diagrams relating to aircraft navigation and flight-management systems, electronic cockpit displays, head-up displays, digital air-data computers, radar, Doppler navigation, VOR/DME, Decca, LORAN, inertial navigation, satellites and external data links.

Period aviation and electronics advertisements include McDonnell Douglas promoting the DC-9-20, Ferranti air traffic control training systems, STC PAR Type SLA-3-C, Wilcox Mark 12 ILS, SAGEM MGC 10, Marconi MARS message switching equipment, Thomson-CSF air traffic control systems, EDO LORAN equipment and Air Vision prefabricated control towers.

40 pages including covers. Used condition, with wear, vertical crease.