When is the AFM test considered complete?

The AFM test is considered complete when the air flow does not exceed 60 CFM. This measurement is crucial because it indicates that the air brake system is functioning properly and that there are no significant leaks or issues within the system. Keeping air flow within this limit ensures that the brakes can apply and release efficiently, which is vital for safe train operation.

Other aspects of the test, such as visual inspections of the brakes or verifying piston travel, provide important information about the condition of the braking components, but they do not alone determine the completion of the AFM test. Similarly, receiving a signal to release is part of the operational protocol but does not signify that the test parameters have been met. Hence, monitoring air flow is the definitive factor that confirms the AFM test's completion.