Emergency services were called to the airport after the jet, described as ex-military, crashed at about 3.40pm.

Witnesses said the plane was about to take off when its front wheel collapsed, causing it to skid until it stopped in a patch of grass, spilling fuel along the way.

Two fire crews responded to the scene.

A Fire and Rescue NSW spokeswoman said two people were on board when the plane fell to the ground. They were able to quickly climb from the jet on their own.

Nine firefighters were on the scene, where they have covered the spilled fuel with foam.

Crews were working to decant the rest of the fuel from the plane, and were liaising with airport staff.

Fairfax Media understands the plane involved is a L39 Albatros​, manufactured by Czech company Aero Vodochody. The jet's principal use around the world is for military training.

However, records show this plane is owned by a securities trader and racing fan from central Sydney, who often uses it for joy flights over Sydney and the Blue Mountains.

A NSW Ambulance spokesman said paramedics were alerted to "an incident" at Airport Avenue in Bankstown.

No patients were assessed or treated.

The Australian Transport Safety Bureau is gathering information to decide whether it will investigate the crash. It is understood the decision to investigate won't happen until next week.

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