Most of the N series problems were fixed by that serial n. It will have the slowed down 670I engine so the throwing rods and breaking bolts was greatly reduced. It has the AMBAC fuel system so it no longer puts half the fuel out the stack as smoke. I have an 82 that went 3100 hours before I did the underhaul and it could have gone longer from the parts we replaced diamensions. If it has had good care it will be a very good machine.
