Which statement about pneumatic lifting bags is correct?

Pneumatic lifting bags are designed to lift heavy loads safely and effectively, and one crucial aspect of their operation is ensuring that they are used on or against a solid base. This is important because a solid base provides stability and prevents the possibility of the bags slipping or shifting under load, which could lead to accidents or failures during lifting.

Using the bags on solid surfaces ensures that the lifting force is evenly distributed and minimizes the risk of damage to the bags themselves as well as the object being lifted. It also helps to maintain the integrity of the lifting operation, as an unstable base could compromise the entire lifting process, potentially endangering both the rescuers and any victims in a vehicle rescue scenario.

While cribbing is an essential part of many lifting operations to create a level and stable base, it is not applicable in every situation, such as when using pneumatic bags directly on stable surfaces. Therefore, ensuring the bags are placed on or against a solid base maximizes safety and efficiency during the lifting operation.