What should be the air flow indicator reading to ensure proper brake pipe integrity testing?

To ensure proper brake pipe integrity testing, an air flow indicator reading of less than 60 CFM is essential because this level indicates a good seal and adequate performance of the air brake system. This reading suggests minimal leakage, which is crucial for ensuring that the brakes will operate effectively when needed.

When the flow is at or below 60 CFM, it typically reflects that the brake pipe is maintaining its integrity under pressure, allowing for reliable brake application across the entire train. Higher readings can signify potential issues such as leaks in the brake system, which would negatively impact the safety and function of the air brakes. Therefore, keeping the reading below this threshold is vital for the assurance of brake system reliability and performance.

This standard is important for operational safety and is a key part of pre-operation checks in train handling practices.