f the seats are fitted with five safety pins and the one in the seat pan was incorrectly fitted, regardless of how, why did the other pins insertion not stop the firing sequence? Is not the removal of the pins the last sequence before engine start as another safety check?
At that stage of the proceedings (ie after engine start) all the pins were already removed and therefore the seat was completely 'Live' - on the hawk - the last 2 pins (seat pan handle and canopy internal mdc pin) are removed and stowed immediately prior to engine start - all other pins are removed before strap in !