Which of the following is NOT a component of SCBA?

• A. Harness
• B. Mask Mounted Regulator (MMR)
• C. Dust Cover
• D. Face Shield

Answer: (D)

SCBA is built around delivering breathable air through the equipment worn on the body. The essential pieces that actually provide and regulate that air are the harness (to carry the unit), the mask or facepiece, and the regulator system that controls air flow (often mount-regulated as a mask-mounted regulator). A protective dust cover is an accessory that helps keep parts clean and protected when the system isn’t in use, but it doesn’t affect the breathing function.

A face shield, while important protective gear for the eyes, is part of the helmet, not the breathing apparatus. It doesn’t connect to or influence the air supply, regulator, or mask system. That’s why it isn’t considered a component of the SCBA.