dctyke:-
It could NOT be overtightened when fitted in the seat bay because it (the drogue shackle) was pre-assembled (bolt already fitted) before sliding into an open scissor shackle and the BTRU cocked. If it was too tight it would simply of not have gone into the scissor shackle. It was the advent of extending seat servicing times in recent years which meant they had to frig a way of undoing the drogue shackle bolt to enable the beam crack testing to be carried out. Simply the shackle system was never really designed to have the bolt removed/fitted in-situ.
Thanks for that, dctyke. I know that this is the second time that you have posted to the same effect and you may well have to do so again (given that you are dealing here with aircrew!) So the big change regarding this bolt is that it was never undone in situ, but suddenly all that changes and it has to be. Ergo, it has to be replaced and done up again, ergo stuff happens...
Why was this not in the SI, I wonder...