This research aims to develop a design proposal for an alarm detector and sprinkler system in the workspace of Air Squadron 17 at Halim Perdanakusuma Air Force Base. Aircraft hangars are work facilities with a high fire risk due to aircraft maintenance activities, the use of technical equipment, the storage of chemicals, and the presence of flammable materials. From an Industrial Engineering perspective, these conditions require the design of a safe, reliable, and sustainable work system through the application of Occupational Safety and Health (OHS) principles. One effective fire risk control measure is the implementation of an active fire protection system in the form of automatic alarm detectors and sprinklers. The research methods used included identifying potential fire hazards, analyzing fire protection system requirements, calculating the number and placement of alarm detectors and sprinklers based on applicable standards, as well as designing pipelines and summarizing material requirements. References used in the design included the NFPA 13 standard and national regulations related to OHS and fire protection. The results of the study indicate that the proposed alarm detector and sprinkler system design is capable of providing optimal fire protection throughout the hangar workspace. This design is expected to improve personnel safety, protect strategic assets, and support the operational continuity of Air Squadron 17. Furthermore, the results of this study can serve as a technical reference in designing fire protection systems in similar work facilities.