Digital Modernization and Operational Validation of CRT-Based Azimuth Indicators for Legacy Aircraft

Despite their continued operation in legacy aircraft, CRT(Cathode-Ray Tube)-based Azimuth Indicators exhibit significant limitations, prompting the need for digital modernization. The upgraded display unit maintains mechanical compatibility with existing 3-ATI(Aircraft Type Indicator) interfaces while achieving reduced size and weight. Functionally, it extends beyond basic RWR(Radar Warning Receiver) symbology to integrate MAWS(Missile Approach Warning System) and DIRCM(Directional Infrared Counter Measures) alerts as well as BIT(Built In Test) information, and it supports NVIS(Night Vision Imaging System) operation for night missions. The prototype was subjected to functional and environmental validation, confirming compliance with operational requirements. The results demonstrate a practical modernization approach that enhances maintainability, situational awareness, and survivability of legacy aircraft.