This module encompasses the requirements of SAR-66 Category B1-B2: Module 4 – Electronic Fundamentals and Module 5 – Digital Techniques and Electronic Instrument Systems. This module helps to develop foundational knowledge of digital techniques and electronic instrument systems employed in the aviation industry by exploring the basic building blocks of digital system and techniques. This module also provides a foundation for the understanding of aircraft electronic instrument systems. The topics covered in this module spans from diodes, transistors integrated circuits, logic circuits, computer structure, multiplexing, microprocessors and servomechanisms used in the aviation industry.