"A spokesman for Eurocopter said tests by Bond and two other EC 135 operators in Europe found possible similar supply-tank fuel gauging errors that overestimated the fuel on board.
The first analysis shows that the indication of the fuel quantity in the supply tanks could be overestimated," the company said in a statement.
All crews should be aware that in the worst case a red warning "Low Fuel" could appear without any amber FUEL Caution before."
Possible they got a (wrong) red light when in a difficult position and it acted as a major distraction..................