When should an air chisel be prepared for use?

Preparing an air chisel for use involves ensuring that it is ready for the tasks required in vehicle rescue scenarios, which includes safety and operational effectiveness. Having the air chisel in position and prepared for contact with a solid surface is critical because it ensures that the user can apply the proper force at the time of operation. This positioning helps in preventing accidental injuries and ensures that the tool operates as intended.

In this context, placing the air chisel against a solid surface before activation signifies readiness and allows the user to control the tool correctly when they begin using it. It also prevents any unintended misfires or slips that could occur if the tool were activated while not securely in place.

Other options relate to different aspects of readiness or maintenance but do not focus directly on the immediate preparation necessary once a user is ready to utilize the air chisel effectively at the point of contact.