What must passengers do if an oxygen mask is deployed?

When an oxygen mask is deployed, the primary safety protocol requires individuals to secure their own mask before assisting others. This procedure is crucial because it ensures that a passenger can breathe effectively and remain conscious while addressing any additional assistance needed for others, especially in an emergency situation. If a passenger is unable to secure their own mask first, they may become incapacitated and unable to help themselves or others. Therefore, prioritizing one's own safety is fundamental in maintaining overall safety and order during an emergency scenario involving a loss of cabin pressure.

While other options suggest behaviors that might seem appropriate, they do not align with the established protocols designed to maximize safety. For instance, removing face coverings might not be necessary in all situations, and waiting for crew instructions could delay vital response actions when immediate self-help is critical. Assisting infants and others can certainly be important, but it must come after ensuring one's own mask is secure to ensure that everyone can receive help.