4427612 was produced 13-Nov-2001
Engine Type: ROTAX 912 ULS
Engine Version: 912 ULS2
Model Number: 309120110
If all the required retrofits were done, then it was 'eligible' for a TBO extension up to 15 years / 2000 hours "WHICHEVER COMES FIRST" - but even then, as of November 13th, 2016 it was officially due for overhaul.
(If the TBO-extension-retrofits were not noted in your log book, then the TBO due date was back in 2013...)
The calendar time is important (not just the running hours!) - "rust never sleeps" &etc...
