The NASA report linked through alpine flyers earlier post highlights the problems with high bypass turbofans on airliners being the blocking of the cooling holes and passages in the turbine blades rather than the melting of the ash in the combustion chamber.
The turbine blades are then operating above their design temperature which will affect their life but not their ability to work - it is still a case of accepting engineering penalties and getting flying again rather than not flying because of a safety risk that the engines might flame out.
We have had all sorts of helpful people on the news saying things like 'a double engine failure in say a 767, will mean all on board will die' - talk about scaremongering
