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Goldhofer K4 Bison Aircraft Tractor

Maker:  Conrad
Model No:  5518
Scale:  1:50
Review Date:  April 2021

Conrad Index
Municipal Equipment Index

Cranes Etc Model Rating
Packaging   (max 10) 8
Detail   (max 30) 23
Features   (max 20) 17
Quality   (max 25) 19
Price   (max 15) 10
Overall   (max 100) 77%


Goldhofer K4 Bison Aircraft Tractor Video.
Goldhofer branded box.
Rear details.
Cab raised.
Distinctive machine.
A low headroom vehicle.
Rear driving platform.

The Goldhofer Bison series are tow bar aircraft tractors used for positioning larger aircraft. 

The machine number is not marked on the model or the packaging but optically it appears to be closest to a D 1000.


The model comes in a Goldhofer branded box with good quality foam packaging inside. 

The review model had no defects or missing parts.

An instruction sheet is included with the model, but there is no information about the real machine. 


Underneath the construction is fairly simple, but the axles are detailed in plastic,  The tyres have a good tread pattern and the wheels are detailed in plastic.  Small plastic jacks are modelled at each corner.

At the front the cab is metal with triple seats inside, windscreen wiper,s and good beacon lights on the roof.  A small Goldhofer badge and chevrons give a realistic appearance.  The towing attachment is made of red plastic, and as there are three in the model set, it would have been better if painted metal parts had been developed.

The body sides are plain with small graphics adding detail, and there are nice large bison graphics also. 

At the rear the detailing is good with coloured lights.  Cable connection points are detailed by graphics.

On top there is textured surfacing with the ballast blocks being metal.

The optional rear driving platform has detailed controls and a mirror to provide the driver with visibility of the towing hitch.


Both axles have an excellent range of steering movement and all the steering modes of the real tractor can be replicated, including crab steering.

The tractor rolls without being free rolling.

The jacks can be extended and will support the model wheels-free.

The pins in the towing hitches can be removed.

The ballast blocks can be added or removed.

At the front the cab elevates to allow the driver to have a good view to the rear.

The optional rear driving platform can be attached.


This is a robust well made model.

The paintwork is very good, and the graphics are sharp.


It is moderately priced.


This is an interesting model of an airport tractor, and is the latest in a line of such models made by Conrad.  It is nice quality with very good functionality.


The model was released in February 2021. 
In the box.
Profile view.
Cab lowered.
Optional ballast blocks.
Jack extended.
Detailed seat and controls.