Which equipment provides clean breathing air for crew during smoke or hazardous environments?

• A. Air conditioning units only.
• B. Protective Breathing Equipment (PBE) provides clean breathing air for crew during smoke or hazardous environments.
• C. Oxygen masks for passengers only.
• D. Emergency lighting devices.

Answer: (C)

In a smoke-filled or hazardous environment, the crew must have a clean, independent source of breathing air. Protective Breathing Equipment is designed for this purpose. It provides a filtered, clean air supply through a hood or similar enclosure, allowing crew to breathe safely while they handle the situation or evacuate passengers. This supply is independent of the aircraft’s air conditioning system, which circulates cabin air that may be contaminated and is not intended to provide breathable air during a fire or smoke event. Oxygen masks for passengers are meant for passenger use and do not provide the crew with the dedicated, protected air supply that PBE offers. Emergency lighting devices serve a safety function for visibility, not for breathing air. Therefore, the equipment that provides clean breathing air for crew in these conditions is the protective breathing equipment.