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Why must air and electrical lines be supported so they do not drag or rest on moving parts, yet still have enough slack?
- A.Slack in the lines causes the trailer to jackknife
- B.Lines should be stretched as tight as possible between units
- C.Support does not matter because the lines are armored
- D.Lines that drag or chafe will wear through and fail, but lines that are too short or taut can pull apart or bind in turns; they need support with slack for articulation
Correct answer
D. Lines that drag or chafe will wear through and fail, but lines that are too short or taut can pull apart or bind in turns; they need support with slack for articulation
Why
The connection between units lives in constant motion, flexing in every turn and bump. Proper support with working slack is what lets lines survive that motion instead of chafing through or snapping at a gladhand.
Manual topic: Combination Vehicles - Air Lines and Gladhands · From the Combination Vehicles practice bank (CV-245).