This module encompasses the requirements of Singapore Airworthiness Requirements Part 66 (SAR-66) Module 5 (Digital Techniques / Electronic Instrument Systems). This module helps to develop foundational knowledge of digital techniques and electronic instrument systems employed in the aviation industry by introducing the basic fundamentals of digital electronic and data communications such as numbering systems, logic circuits, memory devices, data converters, various bus systems, and fi bre optics. The module also covers computer architecture system, microprocessor and software management tools required in the equipment used in the aircraft.