Funny, but my experience of 146s is that a good team of Engineers who know the aircraft properly can keep one servicable no matter how wet it gets.
146s don't like water ingress. Keep the drain in the forward door area clean and unblocked at all costs. Water seepage here goes right through to the back of hte avionics racks and causes havoc.
Other that that, they are built like brick outhouses and can take a lot of abusive landings, provided you keep the tail off the deck!
Sweet to fly though. I still miss ours....