Phil Lockwood Explains Component Changes in Engine TBO Increase

At the 2010 Sport Aviation Expo, Rotax premiered their new 2010 model of the 912 ULS engine.  Popular among the LSA industry, the 4 stroke 9 series Rotax engine premiered in 1989.  When it debuted, the engine featured a 600-hour time between overhaul (TBO).  

Over time, with much refinement and evolution, Rotax gradually raised TBO times from 600 hours to 1200 hours to 1500 hours.  Now, twenty years after its debut, the 912ULS engines have had their recommended TOB raised to 2,000 hours.

Effective on December 14th, 2009, the 91ULS TBO increase comes as a result of several component upgrades within the engine. 2010 models, as well as most engines produced over the last three to four years, feature all-new crankcases. In addition, the new engines feature fire-sleeving on fuel pump lines, new corrosion-preventing coating on carburetors, and new ignition modules. The new ignition modules feature a more sophisticated spark advance to go from start-up spark timing to the running timing.

The extension will apply to all new engines made and to a select serial range of older 912 series A, F, and S engines going back to 2006 production. If the engine ever had a crankcase change, within the past 2 years, it may also qualify if that part was updated to the current model specification. Owners are advised to read the bulletin carefully to see if their particular engine is included, or contact a regional independent Service Center (iSC). Centers can be located by checking the Rotax Flying Club web site.

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