Oxygen masks should be removed after a decompression when?

• A. When the Flight Deck announces cabin altitude is safe
• B. Immediately after decompression
• C. Only after landing
• D. When passengers calm down

Answer: (A)

When a decompression happens, oxygen masks provide breathable oxygen right away and stay in use until the cabin is stabilized. The correct moment to remove them is when the flight deck announces that cabin altitude is safe. That official signal means the pressurization system has been restored to a safe level and supplemental oxygen is no longer required.

Why this is the best answer: following the crew’s announcement ensures you’re relying on verified conditions rather than how you feel. Oxygen deficiency can occur even if you don’t notice symptoms, so waiting for the official clearance protects everyone from a potential drop in oxygen before it’s safe to stop using the masks.

Why the other ideas aren’t appropriate: removing masks immediately after decompression can leave you exposed if the cabin altitude is still high; waiting until landing delays protection and comfort during the climb out of the affected phase; and deciding based on how calm passengers appear isn’t reliable because symptoms can be subtle or delayed. Always follow crew instructions and remove masks only after the flight deck confirms it’s safe.