In what three ways can oxygen masks be deployed?

In what three ways can oxygen masks be deployed?

• A. Automatically and manually
• B. Automatically, electrically, and manually
• C. Electrically and manually
• D. Automatically, electrically, and mechanically

Answer: (B)

Oxygen mask deployment on aircraft can occur in three ways: automatically, electrically, and manually. Automatic deployment uses a cabin altitude sensor to release the masks when pressure drops beyond a set point, so masks drop without user action. Electrical deployment involves actuation through an electrical control or power signal, which can release or arm the masks independently of the altitude-triggered mechanism. Manual deployment is when the crew or passengers initiate release by operating a control or pulling a release handle, making the masks available even if automatic or electrical systems don’t trigger. These three modes ensure the system works across different scenarios and potential failures, which is why this combination is the best description.

Oxygen mask deployment on aircraft can occur in three ways: automatically, electrically, and manually. Automatic deployment uses a cabin altitude sensor to release the masks when pressure drops beyond a set point, so masks drop without user action. Electrical deployment involves actuation through an electrical control or power signal, which can release or arm the masks independently of the altitude-triggered mechanism. Manual deployment is when the crew or passengers initiate release by operating a control or pulling a release handle, making the masks available even if automatic or electrical systems don’t trigger. These three modes ensure the system works across different scenarios and potential failures, which is why this combination is the best description.