Originally Posted by
RVDT
No airframe filter on 135 or 145 or 350 (standard) or H500 (standard) for that matter and possibly not originally on B206.
They were initially fitted to older aircraft without fuel/oil heaters on the engine. Theory being if there was ice in the fuel you would get impending bypass indication as a pre-warning.
Plus it allowed operation at lower temps without FSII. FSII is nasty stuff.
Agusta seem to have this better thought out. The fuel filters are heated by the engine oil, so that fuel with FSII isn’t required.