Just weeks after Lycoming Engines announced it would seek approval to operate certain engines on ASTM D7547 UL 91 unleaded avgas, it has received FAA approval to update its listing of approved fuels.
Lycoming’s newly available Service Instruction SI-1070R lists 35 engine models approved to operate on ASTM D7547 UL 91 fuel. The models are members of the 235, 290, 320, 340, 360, 435, 480 and 540 engine families. SI-1070R also specifies the lubricants to be used in conjunction with UL 91. SI-1070R is available at Lycoming.com. Continue Reading »
===> Posted on April 17th, 2012 by Janice Wood. No comments. © GAN 2012.