Which statement best describes explosive decompression?

Which statement best describes explosive decompression?

• A. Explosive decompression is instantaneous loss of cabin pressure
• B. Rapid decompression is a very fast pressure drop
• C. Gradual decompression is a slow, progressive loss of pressure with warning signs
• D. A gradual increase in cabin pressure

Answer: (A)

Explosive decompression means the cabin pressure drops essentially instantly due to a sudden breach in the pressure vessel. The defining point is how fast the pressure change happens—so rapid that occupants have little to no warning and air rushes out to equalize with the outside atmosphere in a fraction of a second. This is why immediate oxygen use and a rapid descent are critical responses. It’s different from rapid decompression, which is very fast but not truly instantaneous, and from gradual decompression, where the pressure falls slowly and warning signs appear. A gradual increase in cabin pressure is not related to decompression at all.

Explosive decompression means the cabin pressure drops essentially instantly due to a sudden breach in the pressure vessel. The defining point is how fast the pressure change happens—so rapid that occupants have little to no warning and air rushes out to equalize with the outside atmosphere in a fraction of a second. This is why immediate oxygen use and a rapid descent are critical responses. It’s different from rapid decompression, which is very fast but not truly instantaneous, and from gradual decompression, where the pressure falls slowly and warning signs appear. A gradual increase in cabin pressure is not related to decompression at all.