Air travelling has changed significantly over the years. Travelling is faster and safer, and the prices are more acceptable to the general population. Over the years, travel safety has been increased by choosing new materials for the construction of aircraft, both the fuselage and the interior of the aircraft themselves. The types of piston engines and the materials used to make individual parts of piston engines have also changed. The change in the fire alarm system in the area of aircraft engine, which is also one of the most important aspects of airplane safety, has certainly contributed to the safety of air travel. The goal of fire alarm systems and devices is to be faster and more reliable so that the action of extinguishing and increasing the spread of fire can be taken as soon as possible, saving human lives and material goods. The fire alarm system can be implemented in several ways. It can detect smoke, sudden changes in heat and flames. In this paper, all methods of fire alarm are explained. In addition, the creation of a model of a fire alarm detector that works on the principle of operation of a smoke detector is presented. The smoke detector is made and explained in this paper. The smoke detector works on the principle of refraction of light that occurs inside the smoke, and with the help of a photo resistor, light and sound signaling occurs when smoke appears in the circle around the model.