Gradual depressurisation, also known as subtle decompression, happens slowly over time. Because the air pressure changes gradually, it can be hard to notice until cabin altitude warning systems trigger or oxygen masks drop from the ceiling. This type of depressurisation typically results from issues like a leak in the aircraft’s pressure vessel, a faulty outflow valve, or reduced cabin air inflow due to a malfunctioning compressor or other parts. There have also been instances where aircraft fail to pressurise after takeoff. This can occur because of equipment failure or incorrect operation of the pressurisation controls. If flight crews do not detect and fix this problem before reaching cruising altitude, the absence of proper pressurisation may go unnoticed. This oversight can lead to serious issues, including incapacitation caused by hypoxia.
Gradual Depressurisation
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