What should an aircrew member do after connecting a portable oxygen bottle?

Ensuring proper flow of oxygen after connecting a portable oxygen bottle is crucial for maintaining the safety and effectiveness of the equipment. It's important that the aircrew member confirms that the oxygen is flowing correctly to provide the necessary supplemental oxygen for altitude or emergency situations. This involves verifying that the oxygen regulator is set to the appropriate flow rate and that the system is functioning as intended. Proper flow of oxygen ensures that the aircrew can maintain adequate oxygen levels, which is essential for cognitive and physical performance during flight.

Monitoring fuel levels, adjusting flight paths, or reporting findings to ground control are important tasks, but they do not directly relate to the immediate concern of confirming oxygen supply readiness after connecting the portable system. Therefore, focusing on the flow of oxygen is the most critical action to take in this scenario.