DV, whilst I take your point regarding the AF and the same might be true of the AF, as well as the check by the pilot before entering the cockpit. Is the suggestion that the groundcrew who signed for that AF should be held to account? Given that the application of Just Culture requires a substitution test, which in this case was passed by a number of people in the process who missed the incorrect location of the pin I see the focus should therefore be on how to prevent the recurrence of this problem.