ASpilot2be
Qbicle seat warmer
Actually, from what I hear you shouldnt be able to fire them up. The ash gets inside the engine and melts, then cools. The ash then becomes rock hard.I think the only thing that can take a 747 down is volcanic ash. But then you can fire them back up on your way down.
The only reason the KLM flight was able to start their engines back up is because the air was so cold that the melted ash became so brittle that it broke apart and cleaned its self.
Atleast thats what I was told in class today.