What should be the condition of the air stem during inspection?

The condition of the air stem during inspection is critical because it is a vital component of the vehicle's air brake system. It needs to be secure and not damaged to ensure proper functionality. A secure air stem prevents leaks and allows for consistent air pressure within the braking system, which is essential for the safe operation of the vehicle. If the air stem is damaged or loose, it could lead to air leaks that compromise the braking capacity, increasing the risk of accidents due to insufficient braking power. Therefore, the requirement for the air stem to be secure and undamaged is paramount for safety and compliance with regulations.