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Front #138

ABTH 103.3A

When applying or reapplying the automatic brakes to control speed, the brake pipe reduction should be __ psi or less.


  1. 10
  2. 26
  3. 20
  4. 15
Back #138
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ABTH 103.3A


Answer: 15
Feedback:
15 psi is almost 60% of total service braking. Needing any more force could indicate a dangerous malfunction in the braking system such as a blocked brake. If more than a 15 psi reduction is necessary to control speed, the crew must stop and determine why.