This is one of a series of systems engineering case studies prepared by the Air Force Center for Systems Engineering. This case study analyzes the Large Aircraft Infrared Countermeasures (LAIRCM) system, which autonomously detects and declares Infrared (IR) threat missiles, tracks the missiles and jams the missiles to create a miss, resulting in aircrew and aircraft protection. The system has no interoperability requirements outside the platform on which it is installed. The LAIRCM system consists of five basic subsystem components, all related technical orders (TOs), support equipment, training systems, related facilities, materiel, software, services, and personnel required to ensure the system can perform its intended operational function. The Department of Defense is exponentially increasing the acquisition of joint complex systems that deliver needed capabilities demanded by our warfighter. Systems engineering is the technical and technical management process that focuses explicitly on delivering and sustaining robust, high-quality, affordable solutions. The Air Force leadership has collectively stated the need to mature a sound systems engineering process throughout the Air Force. Gaining an understanding of the past and distilling learning principles that are then shared with others through our formal education and practitioner support are critical to achieving continuous improvement. These cases support academic instruction on SE within military service academies, civilian and military graduate schools, industry continuing education programs, and those practicing SE in the field. Each of the case studies is comprised of elements of success as well as examples of SE decisions that, in hindsight, were not optimal. Chapter 1 * SYSTEMS ENGINEERING PRINCIPLES * 1.1 General Systems Engineering Process * 1.2 DoD Directive 5000 Series * 1.3 evolving systems engineering process * 1.4 case studies * 1.5 Framework for Analysis * Chapter 2 * LARGE AIRCRAFT INFRARED COUN