What is the proper preflight for the POB on the EMB?

The proper preflight for the Portable Oxygen Bottle (POB) on the EMB includes ensuring that the mask is attached and the tubing is in good condition. This step is crucial for confirming that the POB will function correctly in an emergency situation when it is needed to provide supplemental oxygen to passengers or crew. The effectiveness of the POB relies on having all its components secure and operational, as any issue with the mask or tubing could hinder oxygen delivery.

Assessing the condition of the mask and tubing helps to mitigate risks associated with inoperative emergency equipment. Ensuring these components are intact and functioning guarantees that, in the event of an emergency, the supplemental oxygen can be administered smoothly and effectively. Thus, this preflight check is vital for safety protocols and emergency preparedness.

On the other hand, while the location of the POB in the overhead compartment may be important for accessibility, it does not directly ensure the device's functionality. Confirming the weight of the device is not standard procedure for preflight checks concerning oxygen equipment, and checking visual markings for visibility, although useful for ensuring that equipment is clearly labeled, does not address the operational status of the POB itself.