At what concentration is ash in the atmosphere an ash cloud?
Someone posted that it was measured at over 2000ppm. The NASA aircraft that was damaged, flew through 600ppm I believe.
Correct me if I'm wrong, but if a an engine is producing 10,000lb of thrust, it would be consuming 0.01lb of dust per second ppm. Or 36lb per hour (16.36Kg).
600ppm would mean 9816kg per hour passing - and melting - through the engine.