Abstract :
The object of this paper is to describe the radio aids which form part of the B.L.E.U. automatic landing system and only a brief description is given of the system itself. The internationally accepted i.l.s. is used as guidance during the approach phase, and reasons are given why this cannot be used to complete the landing. Two new aids are therefore introduced for the landing phase, magnetic leader cable for azimuth guidance and an f.m. radio altimeter for height guidance. These equipments are described in turn in some detail. Finally there is a discussion on the two main problems to be solved in introducing the system to civil aviation, namely ensuring the extremely high safety level required and finding a guidance system whose ground elements will, at the same time as satisfying the accuracy requirements, be completely acceptable to the installing authorities.
