The topic that will be discussed and thought about is: “Why did De Havilland Comet aircraft inexplicably tear apart in mid-flight? The subject is linked to events in the early 1950s, when planes called "De Havilland Comets" mysteriously broke apart in mid-flight. The purpose of this essay is to investigate and think about why these planes crashed. The main points that will be discussed are why the "De Havilland Comet" planes tore apart in mid-flight, ideas of stress concentration, engineering thinking about what went wrong, how engineers of the future can learn from it and what it means. it takes to be an engineer in today's world. On March 3, 1953, the first De Havilland comet fell near Calcutta. This accident was thought to be due to excessive stress from aircraft body fatigue caused by a tropical storm (WITHEY, 1997). However, within three months, two other planes crashed and suffered similar damage to their cabin bodywork as the first plane (James, n.d.). After these accidents, the entire fleet was grounded until the problem was discovered. Tests were carried out in which the cabin of Comet G-ALYU was pressurized using water and loading on the wings was simulated using hydraulic cylinders (WITHEY, 1997). These tests helped speed up the flight situation so that the tests were faster. After 3057 flight cycles at 11 psi, it was noted that cracks were observed on the corners of one of the windows, causing the removal of 4.5 m of cabin wall (WITHEY, 1997). This would cause depressurization in the cabin, creating an explosion with a bomb force of 220 kg (Lienhard, 1997). The wreckage of the first plane to crash was found... middle of paper ......egories: basic engineering, energy conversion, energy resources, engineering and technology management, environment and transportation, manufacturing, materials and structures, systems and design (Careercornerstone.org, nd). The role of an engineer in society is to solve a mathematical or scientific problem in a way that improves the quality of life of society as a whole. In conclusion, it was found that the reason why the De Havilland Comet aircraft were destroyed in the middle of the flight was due to a poor design choice of using square windows instead of round windows in the aircraft. Indeed, a fatigue failure was detected during tests at the corner of one of the windows at the level of the stain hole, causing the appearance of a crack. This led to the removal of 4.5 m of wall causing depressurization in the cabin, hence the planes being torn apart following an explosion...