What is the correct response to an in-flight depressurization?

• A. Don oxygen, descend to a safer altitude, follow depressurization checklist, and coordinate with the crew until stabilized.
• B. Maintain cabin altitude, stay at current altitude, and wait for symptoms to disappear.
• C. Immediately evacuate the aircraft.
• D. Shut off oxygen and continue as normal.

Answer: (A)

When a depressurization occurs, getting oxygen to everyone and lowering the cabin to a breathable level are the immediate priorities. Donning oxygen right away prevents hypoxia as the air becomes thinner. Descending to a safer altitude reduces the cabin altitude and helps restore adequate oxygen partial pressure for passengers and crew.

Following the depressurization checklist ensures all necessary actions are performed in the correct order and nothing is overlooked. This includes maintaining oxygen flow, securing yourself, and coordinating with the flight crew to manage the emergency descent, communication, and readiness for a safe landing. The crew’s coordination helps assign tasks, inform ATC, and prepare for an urgent landing if needed, until the situation is stabilized.

Maintaining cabin altitude, waiting for symptoms, or waiting to evacuate mid-flight are not appropriate responses. Evacuation is reserved for landing or other extreme scenarios, and shutting off oxygen would worsen the situation.