What condition should both the mask and tubing be in during the preflight of the POB?

The correct condition for both the mask and tubing during the preflight of the Portable Oxygen Bottle (POB) is good condition. It is essential to ensure that these components are free from any damage or wear that could impair their function in an emergency situation. A mask that is in good condition will seal properly and provide effective oxygen delivery, while tubing that is undamaged ensures that the flow of oxygen is unobstructed.

Maintaining the equipment in good condition is crucial for safety, as the failure of either the mask or the tubing could lead to inadequate oxygen supply during an emergency, potentially compromising the well-being of passengers or crew members relying on the POB for supplemental oxygen. The focus is on ensuring functionality and reliability in critical situations, which cannot be assured if the items are in a state that is less than good.