June 2, 2016
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.
Find a Service Center
Every Lycoming Service Center can help keep your engine up to date with all Service Bulletins.