601, seems a little strange doesn't it? I know the 802 has a spar life of 20000hrs if it only does bombing work. If you do Ag work as well, the spar life is reduced to 9000hrs.... I guess the theory is during Ag it's heavier for longer and makes a lot of max rate turns while heavy.
Engineer, I can't find anything on casa website about the grounding of the turbine droms, but it is the weekend. I wonder wether casa has grounded them or NAFC has grounded the ones on contract to them. Either way I believe they should be grounded, at least until this latest incident has been investigated.