What is a rapid decompression?

Rapid decompression refers to a sudden loss of cabin pressure that occurs in an aircraft, typically due to structural failure, such as a breach in the fuselage. This event can lead to a significant drop in pressure within the cabin, creating a critical situation for everyone onboard.

In the event of rapid decompression, passengers may experience a number of effects, including a loss of oxygen, which can lead to hypoxia, as well as a potential drop in temperature within the cabin due to the rapid expansion of air. The situation requires immediate action from the flight crew, which often includes deploying oxygen masks and descending to a safer altitude where breathable air is available.

A gradual loss of cabin pressure occurs more slowly and allows for more time for passengers to react and for systems to engage. Decreases in passenger altitude and increases in cabin temperature are not relevant to the defined scenario of rapid decompression and do not accurately describe the event's critical characteristics. Thus, the key aspect that defines rapid decompression is indeed the sudden nature of the pressure loss, making it a significant concern in aviation safety and emergency procedures.