What is the first step of the Air Flow Method (AFM) in a Class 1 Initial Terminal and Road Air Brake Test?

In the context of the Air Flow Method (AFM) during a Class 1 Initial Terminal and Road Air Brake Test, the first step involves charging the brake system to within 15 psi of the regulating valve setting. This is crucial because it ensures the brake system is adequately pressured, which is necessary for subsequent steps in the testing process.

Charging the brake system allows for a stable baseline pressure needed to effectively test the functionality of the brakes. This step also prepares the system for any reductions that will be made later in the process. If the system is not properly charged, it could lead to inaccurate readings during the tests or improper brake applications, which can compromise safety.

Once the brake system is charged correctly, the subsequent steps can include various reductions and checks to confirm brake operation and effectiveness. Thus, starting with this initial charging step lays the foundation for an effective and safe brake test.