Service Bulletin No. 366 C

June 2, 2016

MODELS AFFECTED

All Lycoming engines equipped with Marvel-Schebler, Facet, Precision, or Volare updraft carburetor models MA-3A, MA-3PA, MA-3SPA, MA-4SPA, MA-4-5, MA-4-5AA, and MA-6AA.

TIME OF COMPLIANCE

Within the next 50 hours of engine operation and every 50 hours thereafter during routine engine maintenance

REASON FOR REVISION

Correct the CAUTION after Step 3.

Instances have been reported of leakage through the gasket between the bowl assembly and throttle body of the carburetor, evident by fuel stains in the area of the leak. Leakage of this type can be accompanied by loose screws that attach the bowl and throttle body.