In a previous article, Ron Natalie said:
TBO is advisory only for non-commerical operators. Flight school
aircraft that are flown and maintained regularly, even down here
at sea level, typically will make TBO without working hard. We
had a skyhawk here that was still going strong at 2400 hours SMOH.
It had spent the first 2000+ hours as an Embry Riddle plane and
then the next 3000+ or so in a well-run club. It's still flying
traffic reports in the DC area.

Our flying club aircraft regularly make 2400 or more hours, although our
Warrior only made 1800. Our Lance currently has 2700 hours on its IO-540.
Club aircraft get lots of hours, over the whole year, so that helps keep
the rust off. Plus, they're well maintained, and flown by people who
treat the planes like they own them.

When an engine is getting near to or over TBO, we do an oil analysis every
oil change instead of every other to see if it starts making metal, and we
watch compressions.

--
Paul Tomblin http://blog.xcski.com/
My name is *ozymandias[], array of arrays
Look on my stack trace, ye mighty, and despair.