From elsewhere ref C-5 tail:
"We also had a Loran coupler in the T-Tail of the C-5. There was a access hatch to the tail and ladder that we climbed up the inside of the tail to another hatch and access at the top of the tail. We put on a safety harness and actually climbed out on top of the tail to change the coupler. I climbed the tail several times but only helped change a coupler once and that was one time too many."