Same for me - I remember a giant "airplane" frame, made of steel pipes/tubing, it was maybe 5 meters wide, 10 meters long, and was at least two meters off the ground.

There were little ladders to enter the body, and monkey-bars along the wings.

I've often thought back and wished I had photographs of it, as it was in a giant field of grass, on a huge slab of concrete. When you fell, and you'd always fall, you remembered it.

Most of the UK parks were like that; concrete/tarmac islands with heavy/solid items on them.

Later there were token changes, removing the tarmac and putting in wood-chip. Eventually even that wasn't enough and all the "dangerous" items were removed and replaced with smaller ones, with rounded corners and less risk of falling.