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...

Date: September 9, 2016 SUBJECT Inspection and Removal of TCM and Bendix S-20 and S-1200 Series Impulse Coupling Magnetos. MODELS AFFECTED All Lycoming aircraft engines with TCM and Bendix S-20 and S-1200 series impulse coupling magnetos. TIME OF COMPLIANCE Within the next 10 hours of engine operation. REASON FOR REVISION Exclusion of Bendix Model S-20 or S-1200 magnetos with a snap-ring impulse...

Date: September 12, 2016 REASON FOR SUPPLEMENT Provide an alternate method of compliance to Service Bulletin No. 475C if the crankshaft gear is replaced rather than modified. NOTICE: Incomplete review of all the information in this document can cause errors. Read the entire Supplement to make sure you have a complete understanding of the requirements. The FAA has approved this supplement as an...

What is Detonation? Detonation is the abrupt combustion or explosion of the fuel charge inside the cylinder. During normal combustion, the spark plugs ignite the fuel charge and the fuel has a consistent and even burn as the piston moves through the power stroke and chemical energy is efficiently converted to mechanical. In simplified terms, when detonation occurs, the fuel charge ignites quickly...

DATE: October 18, 2016 MODELS AFFECTED: All Lycoming reciprocating aircraft engines TIME OF COMPLIANCE: BEFORE FURTHER FLIGHT REASON FOR REVISION Applies to all Lycoming aircraft engines (not just direct drive engines); added checklist specific for Lycoming geared engines; updated checklist which applies to all other Lycoming aircraft engines, added check for connecting rod squareness to the...

May 6, 1957 MODELS AFFECTED: All Lycoming opposed series aircraft engines. TIME OF COMPLIANCE: During periodic inspection of the engine. (100 hour intervals, or more often at discretion operator.)

DATE RELEASED: June 1975 TITLE: O-340 Operator's Manual DOCUMENT PART NUMBER: 60297-3 MODELS AFFECTED: O-340-A1A, O-2440-A2A, O-340-B1A

DATE RELEASED: May 1998 TITLE: VO-435 & TVO-435 Operator's Manual DOCUMENT PART NUMBER: 60297-8 MODELS AFFECTED: VO-435-A1B, VO-435-A1C, VO-435-A1E, VO-435-A1D, VO-435-A1F, VO-435-B1A, TVO-435-A1A, TVO-435-B1A, TVO-435-D1A, TVO-435-D1B, TVO-435-F1A, TVO-435-G1A

DATE RELEASED: September 2008 MODELS AFFECTED: O-235-C1, O-235-C1B, O-235-C1C, O-235-C2A, O-235-C2C, O-235-F2A, O-235-F2B, O-235-H2C, O-235-J2A, O-235-K2A, O-235-K2B, O-235-K2C, O-235-L2A, O-235-L2C, O-235-M1, O-235-N2A, O-235-N2C, O-235-P2A, O-290-D, O-290-D2, O-290-D2B, O-290-D2C