Weight and Balance seem OK, Icing very likely
I did weight and balance calculations using Pilatus own digital AFM. Weight and Balance were not issues. There were seven children on board of ages 2,3,4,4,5,7,9. There were four adult men and three adult women on board. Photos in the paper show them to be of normal size and weight. I assumed 960 lbs of baggage and 300 gallons of a possible 400 gallons of fuel.