>>1091927>Which would ground a bunch of historic aircraft permanently once they run out of hours on their engines
That isn't how engine certification works, you can reproduce old designs, you simply couldn't get new designs approved for enterprise purposes.>Besides, the environmental gains are questionable
Lead is about the worst thing you can put near where humans are, it causes loss in IQ.>I'd be more interested seeing wider roll-out of avgas 91/96UL that they have been experimenting with in Sweden as an alternative to mogas which has all sorts of tomfoolery that makes aviation use downright dangerous
You can convert an engine from leaded to unleaded fuel with a simple valve seating change, and adjusted piston seals. The whole purpose of lead in fuel was to cake the combustion chamber with a soft coating, sealing up gaps and preventing piston wear.
Unleaded fuel is only dangerous when misused, like anything in aviation.