fergineer,
I didn't say the -500 had a tail skid, I said that when the tail skid took a good hit there was usually damage to skid mounting structure. I was on the L-1011 program at Lockheed for over 30 years the last 20 in customer support, including a couple of years with the RAF as their in house technical rep. So I think I know which models have tail skids and which ones don't.