Report on the Vidsel uncommanded ejection is out today. Swedish only naturally
http://www.havkom.se/virtupload/news/rm2008_01.pdf
The conclusion summary:
3.2 Orsaker
Olyckan orsakades av brister i kvalitetssäkringen av flygsäkerhetsprocesserna
inom och mellan Saab, Försvarets Materielverk och Försvarsmakten.
Dessa brister resulterade i att flygplanets räddningssystem, efter upprepade
höga G-belastningar, aktiverades på grund av utskjutningshandtagets form,
ytfriktion och placering samt utskjutningsmekanismens låga hållkrafter.
Rough translation.
The accident was caused by flaws in the quality control of the flight safety processes within and between Saab, defense Material Command and the Armed Forces. These flaws resulted in the activation of the aircrafts rescue system (seat), after repeated high g-loads, due to the activation handle design, surface friction and placement, as well as the handles low breaking force
One other interesting fact in the report, is that when they put the seat from the aircraft in the centrifuge at Linköping, 4 different pilots simulated the accident g-loads, and all 4 times the seat initiated ejection.