J Daddy posted:I noticed too, the spacing is different from the head A unit to B unit... and the B unit to trailing A unit. the one in the picture is the worse case gap. Why the difference, is beyond me.
There was discussion about that issue with the last run of Legacy F-3s (probably F-7s) as well. I don't remember the reason, but you could go back and find those threads. Might have been that one end of the B had an electrocoupler which was a different length. Some talked about replacing one of the couplers to even them up.