When should you connect the air lines during the coupling procedure?
a.Before backing under the trailer
b.After the tug test confirms the coupling is secure
c.Before raising the landing gear
d.After raising the landing gear and before driving
Explanation
Air lines should be connected after the tug test confirms the coupling is secure. The general coupling order is: back under the trailer, lock the kingpin, do the tug test, connect air lines, connect the electrical cord, then raise the landing gear.