Which option best describes the step to manually release oxygen masks from the panel using a dedicated tool?

Which option best describes the step to manually release oxygen masks from the panel using a dedicated tool?

• A. Manual Pry Opening
• B. Manual Release Tool (MRT)
• C. Automatic Release Lever
• D. Emergency Cutter

Answer: (B)

The step relies on a dedicated device designed specifically to trigger oxygen mask release when automatic deployment isn’t happening. That device—the Manual Release Tool, or MRT—is what crew members use to engage the manual release mechanism on the oxygen panel. By inserting the MRT into the panel’s release point and actuating it (usually by turning or pressing as specified), the latches are disengaged and the masks drop, starting the oxygen flow. This is the standard, approved method for manually deploying oxygen masks when the automatic system cannot be relied upon. Other terms aren’t used for this purpose. A term like Manual Pry Opening isn’t a formal procedure and isn’t how the system is designed to be operated. The Automatic Release Lever describes the automatic process, not the manual override. An Emergency Cutter serves a different function entirely—evacuation tools, not oxygen deployment.

The step relies on a dedicated device designed specifically to trigger oxygen mask release when automatic deployment isn’t happening. That device—the Manual Release Tool, or MRT—is what crew members use to engage the manual release mechanism on the oxygen panel. By inserting the MRT into the panel’s release point and actuating it (usually by turning or pressing as specified), the latches are disengaged and the masks drop, starting the oxygen flow. This is the standard, approved method for manually deploying oxygen masks when the automatic system cannot be relied upon.

Other terms aren’t used for this purpose. A term like Manual Pry Opening isn’t a formal procedure and isn’t how the system is designed to be operated. The Automatic Release Lever describes the automatic process, not the manual override. An Emergency Cutter serves a different function entirely—evacuation tools, not oxygen deployment.