Learn what an aircraft tug is, how towbar and towbarless tugs move aeroplanes, and the safety checks required for towing and pushback.
An aircraft tug is a specialised ground vehicle used to push or tow an aeroplane when it cannot or should not move under its own power. It connects to the nose or main landing gear, then moves the aircraft for gate pushback, hangar positioning, maintenance towing or remote-stand operations.
Within our Aviation & Real-World Flying coverage, the useful distinction is that the tug is the equipment, while pushback and towing are the operations. Tug movements form part of the wider ground-handling sequence around an aircraft.
What types of aircraft tug are used?
Aircraft tugs fall into three practical groups, chosen according to aircraft mass, landing-gear design, available space and the type of movement required.
| Type | How it connects | Typical use | Main constraint |
|---|---|---|---|
| Conventional towbar tug | A type-specific towbar joins the tug to the nose-gear towing fitting. | Airliner pushback, maintenance towing and general airport work. | The towbar head, shear pin and tug rating must match the aircraft. |
| Towbarless tug | A cradle captures the nose wheels and usually lifts them slightly clear of the ground. | Frequent airline pushbacks and fast turnaround operations. | The tug must be approved for the aircraft's wheel dimensions, gear load and geometry. |
| Aircraft mover | A compact powered or manual unit engages a nose wheel, tailwheel or main wheel. | Light aircraft, workshops and confined hangars. | It is unsuitable for aircraft outside its published mass and attachment limits. |
Some large or unusual aircraft require specialised main-gear movers or multiple vehicles. A tug that can physically reach a towing point is not automatically safe or approved for that aircraft.
How is an aircraft connected to and moved by a tug?
An aircraft is moved only after the equipment, route, aircraft configuration and communication plan have been checked.
- Match the tug and attachment. Ground staff verify the tug's towing capacity, traction and braking performance, then select the approved towbar head or towbarless configuration. Surface condition and gradient also affect the required capability.
- Plan and clear the route. The team checks wingtip, tail and engine clearance and obtains apron or air traffic clearance where required. Wing walkers may be assigned where the driver cannot judge clearances directly.
- Prepare the aircraft. The parking brake and chocks remain in use until the team is ready. On aircraft that require it, staff install a nose-wheel steering bypass pin or select the approved towing mode so the hydraulic steering system does not resist the tug.
- Connect and inspect. A conventional towbar is locked to the aircraft and tug, including its specified shear pin. A towbarless tug centres the nose wheels in its cradle and secures them before lifting or loading the gear.
- Establish communication. The tug driver, headset operator and flight deck or brake rider confirm commands, brake status and the intended stopping point. Movement must not begin on an assumed hand signal or an unconfirmed brake release.
- Move slowly and smoothly. The tug supplies the traction and normal braking. The driver avoids abrupt acceleration, excessive speed and turns beyond the aircraft's published nose-gear steering limit.
- Stop and disconnect. The aircraft parking brake must be set and positively confirmed before the tug is detached. Chocks are installed when required, the bypass pin is removed, and the flight crew is shown or told that normal steering has been restored.
Exact sequences differ by aircraft and operator, so the aircraft towing manual and local procedures take precedence. For a departure operation, our complete gate-pushback sequence covers the connection, brake release, engine-start coordination and tug release in context.
Who steers and brakes during towing?
The tug driver normally controls direction and routine stopping, while a qualified person at the aircraft controls remains ready to use the aircraft brakes when the procedure calls for them.
With a towbar, steering input passes mechanically from the tug through the bar to the nose landing gear. A towbarless tug turns its wheel cradle and the captured nose gear. The pilot or brake rider does not normally steer with the tiller during the tow; doing so can make the steering system fight the tug or exceed gear loads. We explain the two arrangements more closely in our guide to how tugs steer an aircraft during pushback.
Uncoordinated aircraft braking can overload a towbar or cause the tug and aircraft to jack-knife. Aircraft brakes are therefore applied only under the agreed procedure or in an emergency, not simply because the brake rider thinks the combination should stop faster.
Is an aircraft tug the same as a pushback tractor?
A pushback tractor is an aircraft tug assigned to push an aircraft away from its stand, but aircraft tugs also perform longer towing and positioning jobs.
Pushback is common at nose-in gates because using reverse thrust near a terminal would create jet blast, noise and foreign-object hazards. During an approved pushback, engines may be started, but their thrust is not used to help the tug. Maintenance towing and hangar moves are normally performed with the engines shut down.
Common aircraft-towing mistakes
Most towing damage comes from mismatched equipment, poor communication or exceeding landing-gear limits rather than a lack of tug power.
- Using the wrong towbar head or tug rating: a connection that appears to fit may still have the wrong geometry or load limit.
- Omitting the steering bypass procedure: hydraulic steering can resist the tug and damage steering components on aircraft that require isolation.
- Leaving the bypass pin installed: the flight crew may have no normal nose-wheel steering when taxi begins.
- Turning too tightly: exceeding the marked or published steering angle can damage the nose gear, tow fitting or steering links.
- Disconnecting before brake confirmation: even a slight slope can allow the aircraft to roll.
- Ignoring the wingtips and tail: the tug may clear an obstacle while another part of the aircraft does not.
- Treating a broken shear pin as a routine delay: the tow must stop so the cause, alignment and aircraft attachment can be checked under the approved procedure.
How are aircraft tugs handled in flight simulators?
Flight simulators usually simplify tug operation into a pushback request, direction command and stop or disconnect command.
The exact controls depend on the simulator, aircraft and ground-services add-on; some systems follow the nose-wheel angle, while others ask for left or right tail movement. Our guide to requesting, steering and ending a simulated pushback explains that convention and the common direction-control mistake.