What is the proper uncoupling sequence for the tow bar at the end of a tow?

• A. Stop tractor, confirm aircraft stable, disconnect tow bar from nose gear, remove safety chain, and remove pin in a controlled manner.
• B. Stop tractor, remove safety chain, disconnect tow bar, remove pin.
• C. Stop tractor, confirm aircraft stable, disconnect tow bar from nose gear, remove safety chain, and remove pin in a controlled manner.
• D. Stop tractor, disengage parking brake, exit vehicle.

Answer: (C)

The essential idea is to uncouple in a safe, controlled way that keeps the aircraft from moving and prevents any reattachment or tangling of components. Start by stopping the tow tractor and confirming the aircraft is stable so no shifting can occur when you break the tow connection. Then disconnect the tow bar from the aircraft’s nose gear while the system is still braced, so the nose gear isn’t left under load once the bar is released. Next, remove the safety chain so there’s no tether dragging or snagging during final disengagement. Finally, remove the pin in a controlled manner to complete the uncoupling and allow safe stowage of the tow bar. This order minimizes movement risk, prevents unintended reattachment, and ensures all connections are managed deliberately. Other sequences can bypass stability checks or release chains and pins too early, which raises the chance of unwanted movement or damage.