On joining IX Sqn in 1964 one of the first things I was taught as a co-pilot was to replace the Tail Braking Parachute. It was about the only aircrew servicing we were qualified to do. It was necessary because it was a mandatory stream on runways of 7500ft or less and we always carried a spare chute in the bomb bay.
We were warned about the vagaries of the badly designed screw jack affair that was used to close the bay door after fitting the replacement - it was not wear as we were still receiving new Vulcan B2's at the time. We were told then that an airman had been killed sitting on the door to latch it shut when the screw jack slipped. We were also told that only way to get the door shut was to sit on it and bounce up and down!
ACW