Which of the following is a sign of depressurization?

Which of the following is a sign of depressurization?

• A. Appearance of drop-down masks
• B. Engines sound normal and no signs
• C. Passengers take selfies
• D. The air in the cabin remains comfortable

Answer: (A)

Depressurization automatically triggers the aircraft’s emergency oxygen system, so masks drop from the overhead panels to provide passengers with oxygen. That visible deployment is the clearest, immediate sign something has gone wrong with cabin pressure. The other scenarios describe nothing out of the ordinary or even a comfortable cabin, which wouldn’t occur during depressurization. So the appearance of drop-down masks is the best indicator that depressurization has occurred.

Depressurization automatically triggers the aircraft’s emergency oxygen system, so masks drop from the overhead panels to provide passengers with oxygen. That visible deployment is the clearest, immediate sign something has gone wrong with cabin pressure. The other scenarios describe nothing out of the ordinary or even a comfortable cabin, which wouldn’t occur during depressurization. So the appearance of drop-down masks is the best indicator that depressurization has occurred.