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Front #73
ABTH 100.10A
A Class 1 air brake test is required on any portion of the train that has not been kept charged (off air over ____ hours). Select the best answer.
Answer: 24Feedback: Any previous Class 1 air brake test is void if a car has been off air for more than 24 hours making it necessary to conduct a Class 1 air brake test on the portion of the train that has not been kept charged.