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Front #42

ABTH 100.9B

What equipment is required to perform the Air Flow Method (AFM) of testing brake pipe leakage? (Select All That Apply)

  1. Train with a gauge or device at the rear of the train
  2. Controlling locomotive with a maintaining-type automatic brake valve
  3. Air flow meter that functions within calibration requirements
  4. Locomotive with an air flow meter measured in increments no greater than 10 CFM
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ABTH 100.9B


Answer: -Controlling locomotive with a maintaining-type automatic brake valve -Locomotive with an air flow meter measured in increments no greater than 10 CFM -Air flow meter that functions within calibration requirements -Train with a gauge or device at the rear of the train
Feedback:
All BNSF locomotives have a maintaining-type automatic brake valve. This valve compensates for leakage and keeps the brake pipe pressure from dropping. If the controlling locomotive does not have the required equipment to perform the Air Flow Method to test for leakage, then use ABTH 100.9C Brake Pipe Leakage Method to properly perform the required leakage test.