What is the purpose of the Protective Breathing Equipment (PBE) on the 737-700?

• A. To provide clean breathing air for crew during smoke, fire, or other hazardous environments.
• B. To supply oxygen to passengers during decompression.
• C. To assist in navigation in low visibility.
• D. To control cabin temperature.

Answer: (A)

Protective Breathing Equipment is meant to keep the crew breathing clean air when smoke, fire, or other hazardous fumes are present in the cabin or cockpit. When such a situation occurs, the crew don the hood and the system delivers breathable air, usually via a chemical oxygen generator, for several minutes (enough time to control the situation and evacuate if needed). This keeps them from inhaling toxic smoke and allows them to operate effectively. It is not intended for passenger use during decompression, nor is it used to control cabin temperature or to assist with navigation in low visibility.