When coupling, what should you check after connecting the air lines and before raising the landing gear?
a.That the trailer license plate is current
b.That air is flowing to the trailer by checking for air pressure buildup and listening for leaks
c.That the trailer doors are closed
d.That the fuel tank is full
Explanation
After connecting the air lines, you should check that air is flowing properly to the trailer. Listen for air leaks at the connections and check that the trailer air pressure is building up. Leaking connections can lead to brake failure.