27 April 2013
Lycoming has released the details of 31 new engines that are now approved to use with UL91.
This brings the total number of approved engines to 63. Engine models added through this approval include the large installed base of: O-235-K, L, M, N, P; O-320-B, D; IO-320-B, D; AEIO-320-A, B, C; LIO- 320-B; HO-360-C; HIO-360-B, G; O-540-A, E, F, G, H, J; and IO-540-C, D, N, T, V, W, AB, AF engine models.
With the Lycoming engine model approvals, the EASA Safety Information Bulletin immediately allows ASTM D 7547 Grade UL 91 use on European Union based aircraft such as the Cessna 152, Cessna 172 Skyhawk and Cessna 182 Skylane; Diamond DA40 and DA42-L360; Guimbal’s Cabri G2; Piper Warrior and Archer; Robin DR 200, DR400-120 Dauphin and DR400-160 Major; Robinson R22 and R44- Raven I; Socata TB9 Tampico and Socata TB20 Trinidad; and many other models.
“Lycoming has expanded our approvals of UL 91 for our engine models in response to the increasing availability in Europe of unleaded aviation-grade fuel supplies for light aircraft,” says Michael Kraft, Lycoming senior vice president and general manager. “This latest revision of SI-1070 represents the final set of currently existing engine models that can operate on UL 91 without any alteration of the Engine Type Design operating limitations.”
“Altering Engine Type Design operating limitations means that aircraft performance would likely be affected. SI-1070S provides consumers and fuel producers alike a view as to which engines have an octane demand that is best satisfied by a UL 100 solution,” Kraft says. “This is why we remain vigorously supportive of a long-term unleaded 100LL replacement fuel and emphasize that UL 91 is not a replacement for 100LL, but a very robust unleaded aviation-suitable alternative to automotive gasoline.”
<a href=’www.lycoming.com/support/publications/service-instructions/pdfs/SI1070S.pdf’ target=’_blank’>www.lycoming.com</a>
