@SMOC
System 1 & 2 hydraulic pressure and return lines are grouped together on the left side passing through the rear pressure bulkhead so it's possible system 2 was lost as well.
If so they would have lost both the left inboard and left outboard elevator leaving them with only 50% elevator control and 1/2 rate stabilizer movement.
The Chariman's Factual Report
http://dms.ntsb.gov/public%2F57000-5...3%2F567126.pdf
is pretty chilling.
Cargo Loadmasters are not certified. Only briefly trained. Are not trained in securing loads like 18 tonne vehicles at all. Pallets were secured to seat rails and other places. Some seat rails used were not approved by Boeing for the purpose.
The final report is going for sure to be highly critical of parts of the operation.
FDR factual report - simulations
http://dms.ntsb.gov/public%2F57000-5...3%2F567192.pdf
At least one 12 tonne vehicle broke free and struck the pressure bulkhead (witness marks) and severed the FDR, CVR and #1 and #2 (and poss #3) hydraulic systems. THS jack screw possibly severed too.
Loss of THS jack screw, or loss of hyd combined with cg shift rendered aircraft uncontrollable in pitch.
Loss of jack screw would turn elevator into a 'servo tab' on THS and reverse controls.
FDR and CVR are the first things to go and nothing at all of the anomalous event is recorded.
http://dms.ntsb.gov/public%2F57000-5...3%2F567193.pdf
CVR transcript
Some load shift had occurred on previous flight. This had been a fuel stop.