To quote the paper, The plane, an RNZAF Devon, was on a training flight from Ohakea when it crashed on Shingle Slip Knob, near Mt Holdsworth, on February 17, 1955.. It seems from wikipedia there were only 137 of these planes ever produced, so momentos from them may well be quite valuable in certain circles.
But anyway, the real relic I wanted to talk about was the cross on top of Hector. I didn't know what it stood for when I ran past it but looking up on the net it was put there in remembrance to all the trampers and climbers who lost their lives in the second world war. Its a beautiful gesture and has stood the test of time.