In a cabin altitude emergency descent, which action pair is performed?

• A. Don O2 Masks...Don/100%; Crew Communications...Establish
• B. Don O2 Masks and Inform Passengers
• C. Don O2 Masks and Reset Cabin Pressurization
• D. Don O2 Masks and Call for Descent to 10,000 ft

Answer: (A)

In a cabin altitude emergency descent, the top priority is to keep the crew oxygenated and ensure clear, rapid coordination among the crew. Donning oxygen masks at 100% right away ensures immediate oxygen delivery, preventing hypoxia and preserving decision-making as the aircraft begins its descent. Once the oxygen is secured, establishing crew communications is essential to coordinate who does what, inform the flight deck, manage the descent profile, and keep everyone on the same page.

Informing passengers or resetting cabin pressurization aren’t the immediate action pair because they don’t address the most pressing needs first: keep the crew alive with oxygen and make sure the team can work together effectively. Calling for a descent to 10,000 ft is part of the plan, but it relies on having oxygen and clear communications in place to execute it safely.