Originally Posted by
Jan Olieslagers
As stated in another thread, a Rotax (if you mean the 912/914 in their several variants) is much too heavy for a US-style ultralight. Those are 120 kg single-seaters. Delighting in more confusion: such an aeroplane is called an SSDR in the UK - the SS standing for single seat if my old memory still serves somewhat.
Thanks!
I own a Tecnam P92 with a Rotax 912 UL.
I know this kind of airplane is sold in the US too.
I do not know in which category it is registered.
But the TBO question is still open. Here in Italy the law prescribes that the engine manufacturer TBO schedule must be respected.
I have heard that in the US this prescription is not mandatory but you can follow other means of compliance such as Reliability Centered Maintenance which is, among the other, to monitor the health of the engine with some techniques. Only when some parameters go out of tolerance then you perform the TBO; parameters are, for example, oil consumption, cylinder differential pressure, cylinder absolute pressure, etc