BN:-
The drogue shackle can be 'loose' when fitted at rest but jam later when the drogue shackle is pulled through the scissor shackle. See page 38, para c of the report
Mortmeister:-
Headbox changes were never done in the Seat Bay on the Mk10 as they were on a different servicing cycle and controlled differently. I would say the whole thing was designed in this way.
There seems to be an issue here, doesn't there? Mortmeister reckons the seat was designed by MB and accepted into RAF service to have the headbox changed in situ, ie the shackle bolt was to be routinely removed and replaced by undoing it and retightening it in situ. Yet Background Noise reminds us that the drogue shackle free movement within the scissor shackle after such in situ tightening was not protection against jamming during a zero zero operation of the seat.
Is this not where a Safety Case should have offered that protection? Is this not where the absence of a Safety Case in this tragedy was a major contributory cause?