Lycoming SI-1070S - Specified Fuels

Subject : Specified Fuels for Spark Ignited Gasoline Aircraft Engine 
Lycoming engine released SI-1070S dated 24 April 2013, which approved a wide varity of engine for use with ASTM D7547 UL91 unleaded avgas.

         

               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.
           European Aviation Safety Administration (EASA) Safety Information Bulletin (SIB) 2011-01 provided aircraft-level approval on the basis of engine approval.
With the Lycoming engine model approvals, the EASA SIB 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; Helicoptères 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. “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. 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.
             UL 91 originally entered into distribution in Europe largely to serve engines and aircraft approved to operate on automotive specification fuels. EASA Safety Information Bulletin 2011-01R1 and R2 provide aircraft level approval on the basis of engine approval.

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