BOING7117,
Do you live under a rock? seems like your sense of orientation is confined to the comforts of wherever hole you're living from... What makes you sure that the Q400 had only 2 incidents regarding the main wheels.. i strongly suggest you back read and read other forums, topics and for the least part please do your research.
One more thing, Here's a link.... ( about Q400's and SAS)
SAS says to stop using Dash 8 Q400 after accidents | Reuters