Whilst not wanting to divert this thread from its subject, I must correct Biggles081053 where he mentions the Partenavia (VH-PNW) accident at Essendon on 10/7/1978.
The investigation (
https://www.atsb.gov.au/media/24632/197802547.pdf) conclusion was "The cause of the accident was that the aircraft became grossly out of trim at a height which did not permit time for the crew to affect recovery."
CC