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.

Comments

Post a Comment

Popular posts from this blog

Cessna 152 Magneto Check

MAGNETO CHECK. NEVER ADVANCE TIMING BEYOND SPECIFICATIONS IN ORDER TO REDUCE RPM DROP. Too much importance is being attached to RPM drop in single ignition. RPM drop on single ignition is a natural characteristic of dual ignition design. The purpose of the following magneto check is to determine that all cylinders are firing. If all cylinders are not firing, the engine will run extremely rough and cause for investigation will be quite apparent. The amount of RPM drop is not necessarily significant and will be influenced by ambient air temperature, humidity, airport altitude, etc. In fact, absence of RPM drop should be cause for suspicion that the magneto timing has been bumped up and is set in advance of the setting specified. Magneto checks should be performed on a comparative basis between individual right and left magneto performance. a. Start and run engine until the oil and cylinder head temperatures are in normal operating ranges. b. Advance engine speed to 1700 RPM. c. Tu
Read more

Brake System Cessna 172

                             BRAKE SYSTEM -MAINTENANCE PRACTICES              1. Description and Operation A. The hydraulic brake system is comprised of two master cylinders, located immediately forward of the  pilot’s rudder pedals, brake lines and hoses, and single-disc, floating cylinder brake assemblies located at  each main landing gear wheel. B. The parking brake system is comprised of a pull-type handle and mechanical connections which are  linked to the rudder pedal assembly. Pulling aft on the brake handle applies mechanical pressure to the  rudder pedals, activating the brakes and locks the handle in place. Turning the handle 90 degrees will  release the parking brake and allow for normal operation through the rudder pedals. C. Brake operation is accomplished by pushing on the upper part of each rudder pedal. This motion is  mechanically transmitted to the respective brake master cylinder, and through fluid-carrying lines out to  the brake assembly where fluid pressure
Read more

McCauley Propeller Installation fixed pitch

Image
Propeller Installation for all fixed pitch propellers (except 1A162 model propellers).                   WARNING: MAKE SURE THE MAGNETO IS GROUNDED BEFORE INSTALLING  THE PROPELLER OR CONNECTING EXTERNAL POWER.                NOTE: McCauley recommends that propeller mounting nuts (if applicable) be replaced at each  propeller installation, whenever possible. However, nuts may be reused providing the threads are in good condition and the locking material prevents turning of the nut on the  stud by hand. Propeller mounting bolts must be magnetic particle inspected in accordance  with ASTM E-1444 or replaced whenever the propeller is removed from the engine.                NOTE: The aircraft maintenance manual or STC installation instructions should always be  consulted for any specialized procedures applicable to a specific aircraft. Various spinner arrangements not manufactured by McCauley may be used which require additional procedures. (1) Make sure the mating surfaces of t
Read more