Could it be that the fuel in question is from an onboard auxilary tank? That might account for the term 'non spill', whereas I am only familiar with Non-Return Valve (Eu) or Check Valve (US) for such things. I thought that the accident in which 2 troops were killed also killed the Crewman, or am I getting more than one accident confused.
It is a bit unfair to impose 'responsibility' of an engineering aspect onto the aircrew for an accident that appears to be covered by 'Normal Operating Hazard' and therefore considered risk by the service. Are we alone these days when things end up in a Coroners Court? Should we be covered by individual insurance for Legal Liability? I would not like to see my family go through the treadmill should I be involved in such an occurance and not live to defend myself.