bdk wrote:
So if cargo did shift, it could be a CG problem, or perhaps some control cables were fouled?
If shifting cargo wasn't a factor, is there something in the control system or control logic that might be responsible?
Of course this assumes it wasn't something simple like a seat track failure or a conventional mechanical failure.
Just some speculation with no information whatsoever to go on besides a distant video. I hope the black (orange) box has survived and will yield more factual info soon.
747-400 flight deck seats are electric in operation ( a flight line guy laying next to the pedestal got gooshed fatally in the early 1990's @ KPAE when his coat snagged on the 'aft' switch and he couldn't shut the seat off). Most of the cables run under the main deck floor (except NGS which run in the lower 41 section sidewalls) and those few from the flight deck down to the underfloor are shielded and have very stout protectors/guards in the cable runs, real metal cables are few since most of the flight system in -400's is FBW, I believe backup rudder is the only system with cables like the 757 and 767 have. The 'Triple' is all electric flight controls.
UPS came very close to losing a D-8-71 on takeoff several years ago when a loose pallet shifted aft, but it got wedged in the siderail guards when it fortunately turned sideways 'just enough'
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which is what an aft out of envelope CG would likely do.
