What steps are involved in donning crew altitude emergency oxygen during a depressurization?

• A. Remove seat belt and open cockpit window.
• B. Activate the life support system in the cabin.
• C. Delay oxygen until after landing.
• D. Put on oxygen mask, secure the flow, confirm oxygen on, verify crew communication, and maintain control while descending.

Answer: (D)

In a depressurization, the top priority is to get breathable oxygen to the crew and keep the aircraft under control while moving to a safer altitude. Donning the oxygen masks right away provides immediate access to oxygen, which is essential as soon as symptoms of hypoxia could begin. Securing the flow and confirming the oxygen is on makes sure the system is actually delivering oxygen and not just perceived to be—preventing a false sense of security if a line or valve is blocked. Verifying crew communication ensures everyone knows the situation, roles, and any actions needed, so the team can coordinate effectively under pressure. Maintaining control while descending ensures the aircraft continues to fly safely as you move to a lower, non-hypoxic altitude, giving you time to reach a comfortable cruising level with reliable oxygen supply. The other options don’t fit because they ignore the immediate need for oxygen, rely on a system not suited for instant depressurization responses, or suggest delaying oxygen until after landing, which would expose the crew to dangerous hypoxia and compromise flight safety.