THE EH101 ELECTRONIC INSTRUMENT SYSTEM

This paper describes the background to the introduction of an Electronic Instrument System (EIS) on the Anglo/Italian EH101 helicopter. The demanded flexibility to accommodate the display needs of several roles leading logically to the adoption of Full color multi-purpose display surfaces and the drive to achieve maximum commonality between military and civil variants is discussed. The configurations arrived at for both variants are described together with the operating philosophy and display formats developed during an ongoing simulator program. The paper continues with a detailed description of the hardware implementation of the EIS including the fully integrated systems architecture and details of the symbol generators, display units and display mode selectors. Emphasis is placed on the robust integrity characteristics and reversionary switching philosophy of the system.