When should you lower the landing gear when uncoupling a truck-tractor from a semi-trailer?

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Prepare for the Alberta Class 1 License Test. Study with flashcards and multiple choice questions, each with hints and explanations. Get ready for your exam!

Multiple Choice

When should you lower the landing gear when uncoupling a truck-tractor from a semi-trailer?

Explanation:
The important idea is that the trailer must be supported and stable before you disconnect anything from the tractor. Lowering the landing gear so the trailer rests on its own legs takes the weight off the hitch, which prevents the trailer from dropping or shifting when you release the fifth wheel and disconnect the air and electrical lines. This stability is what keeps uncoupling safe and controlled, allowing the tractor to back away cleanly once the coupling is released.

The important idea is that the trailer must be supported and stable before you disconnect anything from the tractor. Lowering the landing gear so the trailer rests on its own legs takes the weight off the hitch, which prevents the trailer from dropping or shifting when you release the fifth wheel and disconnect the air and electrical lines. This stability is what keeps uncoupling safe and controlled, allowing the tractor to back away cleanly once the coupling is released.

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