What principle should guide the inspection of the SCBA facepiece?

The principle that should guide the inspection of the SCBA facepiece focuses on checking for damage or wear on seals and the lens. This is crucial because the integrity of the facepiece directly affects the user's safety and functionality of the equipment. The seals are essential for maintaining a proper fit and providing a secure barrier against hazardous environments. Any wear, cracks, or defects can lead to air leaks or exposure to harmful substances, jeopardizing the user’s safety.

Additionally, the lens must be free of cracks or scratches that could impair visibility. Good visibility is vital in emergency situations, where quick decision-making is essential. Regular inspection for these issues helps ensure that the SCBA operates as intended and provides the necessary protection during use. Ensuring the working condition of the facepiece is fundamental to the overall effectiveness of SCBA before entering hazardous scenarios.