For the times that we had hired a helicopter to sling out a GA airplane from the bush, we always tie a 5 foot conifer tree on a line to the tail of the airplane, to prevent exactly what that Chinook did.
Decades back, I was a pilot to deliver a Twin Otter from Holland to Lesotho. We had a great dinner with our host in Lesotho (who invited the Minister of Transport to join us, seeing as we had just flown the seventh airplane into the country). We were told the story: Their previous Twin Otter had departed a small mountain runway, but had a problem and had to return right away. The pilot damaged the airplane just enough on landing back, that repairing it to be flown out was not possible. So, they hired a company to sling it out. As the Twin Otter was too heavy for the Bell 412 to sling out whole, they completely stripped the airplane of everything which they could unbolt, and flew that out first. Then they went back for the airframe. The fellow who told the story said he was aboard the 412 as it was slinging the Twin Otter out. He told us that after a short while, he could feel a sway. I said he looked out a cabin side window, and saw a little of the Twin Otter's wing coming into view... moments later, looking out the other side, other wing.... then a bang and a jolt. The pilot turned back and said "sorry, I had to drop it......".
So they had a complete spares set for the Twin Otter we flew in....