Investigators are still stumped why the Boeing 777 crashed at Heathrow airport last month. The prevalent theory about ice in the fuel seems not to be able to stand scrutiny. Excessive water or other contaminants in the fuel was not found.
Investigators still being the problem is in the fuel system. The latest speculation now seems to be that the plan encountered "unusually low" temperatures that dipped to minus 76 Celsius (minus 105 Fahrenheit) between the Ural Mountains and Scandinavia. This may have affected the operation of the high-pressure fuel fuel pumps.
