FAA Aviation Mechanic General (AMG)Ground Operations and ServicingEasy
A technician is towing a transport-category aircraft with a tow tractor and tow bar. Which practice is essential to prevent damage to the nose gear steering mechanism during the tow?
- ADisconnect the nose gear steering bypass pin (tow-disconnect pin) before towing
- BEnsure the tow bar shear pin is rated well above the steering system's structural limit
- CHave a qualified person in the cockpit to operate the brakes if needed
- DTow the aircraft only at taxi speed to reduce turning radius
Show answer & explanationAnswer & explanation
Correct answer: A. Disconnect the nose gear steering bypass pin (tow-disconnect pin) before towing
Most aircraft have a steering bypass (tow disconnect) pin that must be pulled before towing so the tow bar can turn the nose wheel without damaging the internal steering mechanism. A shear pin that is too strong defeats its protective purpose, and a qualified person for brakes is good practice but does not protect the steering system itself.
Why the other options are wrong
- B. A shear pin is meant to fail at a safe load, not exceed the steering system's limit.
- C. Brake operator is a safety requirement but unrelated to steering gear protection.
- D. Speed control doesn't prevent steering mechanism damage from towing forces.
Tow Bar Steering Bypass Pin
A pin that disconnects the nose gear steering actuator so the wheel can be turned by a tow bar without damaging internal steering components.
- Must be installed/pulled per aircraft-specific procedure before towing
- Prevents damage to steering actuator/gearbox
- Shear pins in tow bars protect against excessive torque, a separate function
Memory trick: Pin it, then tow it — protect the nose before you go.