What is the purpose of a breathing apparatus check before entry?

• A. To verify the SCBA or respirator is functional and ready for use, ensuring crew safety.
• B. To calibrate the respirator's fit and seal accuracy.
• C. To record equipment serial numbers for inventory purposes.
• D. To clean and disinfect the mask exterior.

Answer: (A)

Before entering a hazardous area, you verify the breathing apparatus is functional and ready for use. This means checking that the SCBA or respirator is correctly assembled, the air supply is sufficient, the regulator delivers air smoothly, the low-air warning and alarms operate, and all connections, hoses, and the face piece are secure and undamaged. Completing this check ensures you can rely on the equipment to protect you if conditions deteriorate during entry. The other tasks—calibrating fit and seal accuracy, recording serial numbers, or cleaning the mask exterior—aren’t part of this live-entry readiness check: fit testing or seal checks happen in separate procedures, while serializing or cleaning are administrative or maintenance activities outside the immediate safety check.