What does LL mean in avgas?

Avgas 100LL is a gasoline specially designed for piston engine aircraft. Avgas 100LL is a product blended in refineries which has a blue dye added. “100” is the octane number and “LL” stands for Low Lead content.

Is 100LL going away?

So in summary, Aviation engines present many unique challenges to the development of Avgas and as such there is yet no firm date to replace Avgas 100LL, but there can be little doubt that eventually Leaded Avgas will be withdrawn from use.

What happens when 100LL and 100 mix?

If you mix 100/130 and 100LL you get greenish-blue. I guess they didn’t find it necessary to make the dyes cancel each other out since airplanes originally designed for 100/130 would also run on 100LL.

What is the difference between avgas 100 and 100LL?

The key difference between both types is the percentage of the included tetraethyl lead additive. AVGAS 100 has high lead content, while AVGAS 100LL (low lead) includes low amounts of tetraethyl lead, as the name refers. AVGAS 100 is dyed green, whereas AVGAS 100LL is dyed blue.

Where can I find a replacement AVGAS fuel?

Possible avgas replacements are being tested at the William J. Hughes Technical Center. As the FAA’s plan to identify unleaded avgas replacement fuels moves closer to its 2018 goal, pilots are becoming increasingly interested in what a switch in fuel could mean for them.

Is there a safe way to replace Unleaded avgas?

The compromise was that the FAA would work on a safe way to “get the lead out.” This started a long process of committees working to develop a 100 motor octane unleaded avgas replacement for 100LL. I attended several of these meetings before retiring and they were interesting.

What’s the difference between Avgas 100 and 100LL?

These two differ over antioxidant content, oxidation stability requirements and max lead content. This grade is the low-lead version of Avgas 100. This grade is listed in the same specifications as Avgas 100, namely ASTM D910 and UK DEF STAN 91-090. Avgas 100LL is dyed blue.

Why did the FAA stop using 100 motor Unleaded avgas?

The EPA started to outlaw 100LL, but the FAA stopped that on safety reasons. The compromise was that the FAA would work on a safe way to “get the lead out.” This started a long process of committees working to develop a 100 motor octane unleaded avgas replacement for 100LL.