Explosive decompression is characterized by which timing?

• A. Occurs over several minutes
• B. Occurs only when oxygen is used
• C. Occurs when the aircraft is on the ground
• D. Occurs in less than 0.5 seconds; potentially dangerous

Answer: (D)

Explosive decompression is the fastest form of cabin depressurization. It happens in less than 0.5 seconds, when a rapid breach in the fuselage allows outside air to rush into the cabin and the pressure inside to drop almost instantaneously. That ultra-quick pressure change leaves almost no time to react, so immediate consequences like hypoxia and a strong wind blast can occur unless oxygen is provided and procedures are followed. Emergency oxygen masks deploy right away to supply breathable air, and crew initiate an emergency descent to a safe cabin altitude. The other timing descriptions don’t fit because this event is defined by its extremely rapid, near-instantaneous nature rather than gradual loss, dependence on oxygen use, or occurrence only on the ground.