TAE Gearboxes
I run a modest fleet of 172 diesels and i think i am right in saying that although the gearbox does get changed every 300 hours TAE pay for that and are looking to gradually extend its "TBO" as they assess the wear on returned units. I like these engines a lot and we have been all over the EU and Faroe isles etc. in ours. No experience of the Diamond though but i would guess to say that unless you do a lot of hours the fuel saving is not worth it. With 500 hours a year on each our diesel conversions have re-paid themselves in 18 months(far better than expected thanks to avgas hikes).
SB