What typically causes slow decompression?

Slow decompression is typically caused by an air leak or malfunction of the pressurization system. This occurs when there is a gradual loss of cabin pressure, which can result from small tears, cracks, or faults in the aircraft structure, windows, or systems that maintain cabin pressure. Unlike rapid decompression, which can happen suddenly and is often linked to a catastrophic event, slow decompression allows time for the pressure to decrease steadily, leading to potential hypoxia if not addressed.

This situation can often go unnoticed for a longer period, as the aircraft may still be flying normally and the gradual changes can result in passengers and crew not immediately recognizing the danger. It is crucial for flight crews to be trained to recognize the signs of slow decompression, such as changes in cabin altitude alerts or passenger discomfort, and respond appropriately to maintain safety on board.