All Weather Landing for the BAC One‐Eleven: A Review of the Requirements for All Weather Landing Systems on a Short‐Haul Jet and a Number of Alternative Solutions Varying from a Basic Single Autopilot to a Full Automatic Landing System Available to Purchase

SUMMARY The paper reviews the requirements for all weather landing systems on a short‐haul jet from the aircraft manufacturer's point of view, with, of course, particular reference to the BAC One‐Eleven. The problems of producing a flexible system which will suit many different types of operator with differing operational environments is discussed. The basic provisions made in the aircraft and the basic automatic system for subsequent easy fitment of all weather landing systems are described and a number of possible alternative systems listed, which build up from the basic single autopilot to a fully automatic all weather landing system. The potentialities of each of these systems in terms of removing existing obstacles to lower minima are tabulated. The major firm BAC One‐Eleven development project —that of safe autoflare—is described. This project is intended to result in the autoflare system being available for airline use in 1966. It is recognized that systems which do not go as far as safe autoflare may confer some benefit—although the benefits to be obtained are hard to predict quantitatively —and may be attractive to some operators. On the other hand a fully automatic failure survival system will almost certainly be required to meet the full Phase III requirement. The ability of the BAC One‐Eleven to accommodate this wide range of possible system requirements is described.