DATE: February 4, 2011 MODELS AFFECTED All Lycoming aircraft engines. TIME OF COMPLIANCE Immediately after flight or ground operation in particulate-laden atmospheres. This service instruction gives guidelines for operation, inspection, and service of Lycoming engines which have been operated in atmospheres that have particulate matter such as dust, sand, debris, and volcanic ash.

DATE: February 4, 2011 MODELS AFFECTED AEIO-540-D4B5 Model Engine Installed in H.A.L. HPT-32 Aircraft. TIME OF COMPLIANCE At owner’s discretion. This Service Instruction identifies a new 4 psi flow divider spring Precision P/N 2577011 that is available as a replacement for the 2 psi flow divider spring for improved idle characteristics, especially in hot weather, for Lycoming engine model AEIO-540...

DATE: January 27, 2011 MODELS AFFECTED All Lycoming aircraft engines using automotive fuel. TIME OF COMPLIANCE Before engine storage for a duration of 6-months or longer. The Service Instruction only applies to Lycoming engines that have been operated on automotive fuel (as specified in the latest revision of Service Instruction No. 1070) and are to be stored for 6 or more consecutive months.

Supersedes Service Instruction No. 1427B December 29, 2010 MODELS AFFECTED All fixed wing and rotary wing aircraft (horizontal installations only) with Lycoming reciprocating aircraft engines installed TIME OF COMPLIANCE After field overhaul This Service Instruction identifies the necessary steps for engine break­in, including engine preparation for ground operational tests, flight tests, after...

Supersedes Service Instruction No. 1483 December 21, 2010 MODELS AFFECTED All Lycoming reciprocating aircraft engines TIME OF COMPLIANCE In the field, anytime the intake or exhaust valves are removed from a cylinder that has been removed from the engine, the following valve leak check procedure must be done after the valves (new, repaired, or re-used) are assembled with the valve springs and the...

Supersedes Service Instruction No. 1436 September 29, 2010 MODELS AFFECTED O­360­A3A Engine TIME OF COMPLIANCE At Owner’s discretion In some instances it has been found that operators of the O­360­A3A engine, with certain propellers, have experienced vibration in the right magneto. As a product improvement, a modification kit, P/N LW­15436, is available to the field. Installation of this kit...

Supersedes Service Instruction No. 1192 September 29, 2010 MODELS AFFECTED TIO and TIGO­541­E Series Engines TIME OF COMPLIANCE Anytime valve springs are removed or installed The valve spring compressor, No. ST­25 used for all models of Lycoming engines cannot be used on the TIO­541­E series or the TIGO­541­E series engines because of the difference in the space between the valve rocker shaft and...

Supersedes Service Instruction No. 1299A September 24, 2010 MODELS AFFECTED O-360 with serial numbers up to and including 19774-36A. IO-360 with serial numbers up to and including 13275-51A. LIO-360 with serial numbers up to and including 1062-67A. O-540 with serial numbers up to and including 17269-40. IO-540 with serial numbers up to and including 12775-48. TIO-540 with serial numbers up to and...

Supersedes Service Instruction No. 1453A September 24, 2010 MODELS AFFECTED All Lycoming dual magneto engines and TIO-541-E and TIGO-541 series engines. TIME OF COMPLIANCE At engine overhaul when converter plate is removed or when the oil filter is removed between overhauls. This Service Instruction is to be followed to replace either just the gasket P/N LW-13388 with a new gasket P/N 06B23072 or...