realized their mistake after establishing a visual contact with the gorge. They selected full power, trying to climb above the rising ground of the river gorge, but it was too late. The aircraft first hit trees, below the airport's elevation, then struck a building and crashed into the residential area, leaving a long debris trace. Time of the crash was 9:20 AM. Taking into account elevation of the first impact 91 metres below the airport elevation, and the last approved descent to 550 meters QFE (above the airport elevation), the crew descended below the approved altitude. At 09:21, when the crew did not report, ATC called them - "450, this is Prague. Confirm over PR beacon" "JP450, can you hear me?" "450, 450, do you hear?" "450, I'm broadcasting blindly." Response from JP450 never came. Of 115 passengers and 5 crew on board, 44 passengers and 1 flight attendant survived the crash. Conclusions There are no publicly available investigation reports, CVR transcripts or FDR data, without which the true causes of the crash can only be speculated. It is unknown: if aircraft's navigational instruments and altimeters were functioning correctly and if the crew set them and used properly, if communications between the crew and ATC was clear, precise and without misunderstandings, physical and emotional state of the crew and quality of the Crew Resource Management (CRM). The crash ensued due to the crew descending the aircraft below published MDA and below altitude approved by the ATC. Precisely, taking into account the first point of impact, 91 metres below the airport elevation, and the last approved altitude of 550 meters QFE (above the airport elevation), the crew descended 641 meters (2100 ft) below the approved altitude. Other contributing factors to the crash are: flying the aircraft approx. 0.7 nautical miles (1.3 Km) to the left of the published glide path over PR and L NDBs, bringing it directly into the river gorge, which they didn't succeed to out-climb, inoperative airport's ILS and PAR systems, poor visibility, spatial disorientation of the crew. Taking into account all known facts, this crash can be classified as a Controlled Flight Into Terrain (CFIT) type of accident. Unsupported theories on causes of the crash 6,7 Why the aircraft descended 641 meters lower than the ATC approved, was never clearly determined. There were several widespread theories, but most of them were misguided, according to experts. One of