A girl on a Ferris wheel repeatedly screamed "it's going to crash" as she videoed a light plane which then ploughed into the ride on the NSW mid-north coast in 2011.

Amber Christine Arndell, then 13, was filming herself and her younger brother, Jessie, at the Old Bar Beach Festival when Paul Clarendon Cox crashed his Cheetah Sierra 200 into the 20 metre-high Ferris wheel.

"Oh look, Jessie, a plane. We're going to watch a plane. Oh God, it's going to crash, it's going to crash, it's going to crash. Oh my God," Ms Arndell says in the video, which was shown in the NSW Supreme Court on Monday.

A thunderous bang then follows.