Same vintage, much better performer and much cheaper to operate is a Turbo Commander 690A/B. C90 and 690 were introduced same year (1971), and the 690 was much more advanced. Made the C90 look like a dinosaur.
1. 690 will do 280kts vs 200-something for the C90.
2. The Garrett's burn 20-30% less fuel than the PT6's.
3. It will fly higher.
4. It will fly further.
5. Better cabin differential.
6. Engine overhauls are much cheaper and the 5400hr TBO is almost twice as much as the PT6's. Garrett's are bulletproof.
7. The 5 year gear overhaul on the Commander is about $15K. What's the mandatory gear overhaul on the C90? Probably 3-5x as much.
Do yourself a favor, look at a 690A or B model. They even cost less to acquire, so it's a no brainer.
