Aviation Computer Based Training (CBT) Practice 2025 - Free CBT Practice Questions and Study Guide

Using wet towels or cloths to filter fumes during the smoke/fumes checklist is a practical option when an Emergency Portable Oxygen System (EPOS) is unavailable. Wet towels or cloths can help to absorb some of the smoke particles and provide a barrier against inhaling harmful fumes, as the moisture can trap particulates while also moistening the air that the user breathes. This technique helps make the environment somewhat more breathable and can provide temporary relief in an emergency situation.

It's also important to consider that while other methods might have their benefits, they may not be as effective or suitable for the specific situation. Ventilation masks may not be designed to filter out the toxic components of smoke effectively. Oxygen tanks are typically used to provide pure oxygen, which is not necessarily a filtering mechanism for smoke. Smoke hoods, although useful in various scenarios, may not always be accessible during emergencies. Therefore, wet towels or cloths serve as a readily available, makeshift solution to aid in filtering noxious fumes.