The PA31-350 has a spar life rated at 13000hrs, this gives it a CASA retirement limit of 26000hrs.
I wonder if anyone has done the maths on how long it will be based on the above, before all the PA-31's in Australia are permenantly put out to pasture?
Then replacement will be the only option, but with what?
And seeing as the last one rolled out of Piper's doors around '84, I would wager about 75% currently in service would have been made well before that, and therefore probably won't see out the next 5-10 years?