Avoid loose surface runways: FOD
or Foreign Object Damage
learn from my fail
The effects of volcanic basalt rock (bitumen road-base) on EDF Fan/Motor Units:
Blue metal crusher dust is left over at quarries when they are crushing blue metal (volcanic basalt) rock to be used on bitumen roads. The road constructors buy all of the suitably sized gravel. The 'dust', which contains about 80% dust and 20% fine grit up to 4mm in size, is sold for use in gardens, landscaping, lawns, drive-ways and house slab foundations.