Why can I find the exact replacement “10” dash number for my Lycoming engine in the type certificate data sheets?
When Lycoming certified their engines, they certified a series of carburetors for an engine group. As an example, the O-320 series of engines were certified with MA-4SPA carburetors. This allowed Lycoming to choose the carburetor that best served the engine requirements on the test stand. If you check in the engine overhaul manual, it will usually indicate a Lycoming part number for the carburetor used. This number can then be crossed to a “10” dash number. In some cases, there is more than one carburetor part number eligible for a specific engine application. In this case, you may wish to consult the appropriate airframe type certificate data sheet to find the actual approved engine and then determine which carburetor applies to that airframe/engine combination.
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