The M14 is approved to run on Avgas 91UL.

Rod1

re. the African aid thing... I suspect the aid would have been directed towards reducing carbon emissions in Africa. For example, buying stoves that burn fuel more efficiently or solar lighting. And if you believe in global warming and the idea that Africans will come off worst, then there's also a degree of justice in it. If you don't, then the idea will seem misguided, but there's probably some rationale behind it.

It was from a few years back and I don't think it's come to pass. Instead I believe Europe is trying to tax carbon emissions, which is a rather indirect form of taxing fuel.

You can argue for big or small government, and you can argue what should or should not be taxed, but in principle I don't see taxes as theft myself, and like AN2driver I don't personally see any justice in exempting only airline transport from taxes.

Good news. All we need to do now is to get WW to stock it and hopefully we'll save a few ££££. :ok:

In resect of the initial post:

14 March the case was heard, and thrown out.

District Judge Frederick J. Scullin, Jr. declined to force EPA to study GA emissions. They are free to focus on larger and more major pollution sources first.

Article U.S. District Judge Dismisses Environmental Group's Legal Suit to Force EPA to Regulate Aircraft Engine Emissions : Business Aviation Law Blog

Diamond Aircraft pursuing unleaded fuel capability for all Diamond models | Diamond Aircraft

I also understand Cirrus is working on UL94 certification.

And the TB20 can fly on UL94 as well.

So who's left? :)

Have you got the ref for that?

I recall seeing something recently which suggested the IO540-C4 might be fairly close to it, but it was a bit ambiguous.

It's not the TOTAL UL91 though, which is the stuff everybody (well, Rod1 :) ) in the UK is banging on about. Who is actually proposing to sell UL94 in Europe?

No, pure half-informed conjecture - but I could have sworn I saw a TB20 flying on Hjelmco UL91/96 once, hmm... (correction, not UL94)

Given that GAMI had an awful lot of trouble making a TSIO-550 detonate on various fuels, and having to go to a CHT of something like 500F to do it, it doesn't at all suprise me that one could fly just fine in practice on 91UL - so long as it is "avgas" i.e. doesn't have the high altitude and the quality control issues.

On any realistic flight profile, where one climbs at Vx or Vy for the shortest possible time (due to CHT management) and then trims for a decent speed, and where the power is dropping off pretty fast post-takeoff due to the loss of MP, it cannot be an issue, IMHO. Legally... it's different.

Peter - I was told a newly-acquired TB20 now based at Gloucester was going to be run on UL91 - are you sure yours can't?

I have no idea.

They stopped making them in 2002.

The standard POH is 100LL only (blue) or 100/130 (green).

Plus max 1% IPA or 0.15% EGME for fuel icing protection.

If you look at the 91UL launch thread on Flyer I quoted the EASA position which was if the engine manufacturer had approved the engine then the aircraft with that engine is approved by EASA automatically. That is because 91UL is 100LL without the lead added. I would be surprised if the 540 is cleared yet, but some versions will very likely be over coming months. The links to find out are also in the flyer thread.

Rod1

The C182 O-540 is approved for mogas and has been for many years. It is the various IO540 flavours, which differ in compression ratios.

The Flyer thread is too long to wade through now.

Fields currently stocking Avgas 91UL are:

Barton
Compton Abbas
Dunkeswell
Henstridge
North Weald
Rochester
Turweston
Thruxton
Wellesbourne
Wolverhampton - Halfpenny Green

Popham - NOW AVAILABLE
Gloucester - Staverton NOW AVAILABLE
Oaksey Park - NOW AVAILABLE
Sherburn - NOW AVAILABLE
Wycombe/Booker - NOW AVAILABLE

Airfields that have agreed to take deliveries and are in the final stages of preparation / commissioning of equipment / tanks etc. and who should have the product soon are:

Sleap
Shobdon

Can't help noticing that I have never flown to most of these, and have only very rarely flown to those I have been to.

Rod1 could you tell me who is a UL91 trader/supplier in the UK?

Rod1 most certainly could tell you, but to save him the trouble, UL91 is produced in and distributed from France by Total.

Their UK website is here.

Thx Mariner