Supersedes Service Instruction No. 1125C October 17, 2008 MODELS AFFECTED All Lycoming opposed cylinder engines. TIME OF COMPLIANCE During engine assembly. The use of POB No. 4 Perfect Seal sealant (POB) and silk thread has been used generally for sealing finished parting surfaces that do not employ gaskets. This practice has always been satisfactory when correctly applied. However, we have tested...

Supersedes Service Instruction No. 1275B September 23, 2008 MODELS AFFECTED Precision Airmotive RS and RSA Fuel Injectors installed on Lycoming aircraft engines. TIME OF COMPLIANCE At overhaul and as engine conditions require. Fuel nozzles can become clogged with a type of varnish from old fuel or from precipitate particles that are almost invisible to the naked eye. This condition may be...

Supersedes Service Instruction No. 1519 September 19, 2008 MODELS AFFECTED All Lycoming new, overhauled, rebuilt, or repaired (L)IO, AIO, HIO, IGO, IVO, (L)TIO, AEIO series engine with either a Precision Airmotive RSA­5 or RSA­10 series fuel injection servo. All Lycoming new, overhauled, rebuilt, or repaired (L)IO, AIO, HIO, IGO, IVO, (L)TIO, AEIO series engine with a Precision Airmotive...

DATE: August 22, 2008 MODELS AFFECTED Any Lycoming new, overhauled, rebuilt, or repaired (L)IO, AIO, HIO, IGO, IVO, (L)TIO, AEIO series engine with either a Precision Airmotive RSA­5 or RSA­10 series fuel injection servo which does NOT have a “G” marked on the regulator hex plug. All Lycoming new, overhauled, rebuilt, or repaired (L)IO, AIO, HIO, IGO, IVO, (L)TIO, AEIO series engine with a...

Supersedes Service Instruction No. 1257F May 16, 2008 MODELS AFFECTED Lycoming supercharged and turbocharged aircraft engines. TIME OF COMPLIANCE During engine maintenance. It is important to note that all Lycoming supercharged (GSO and IGSO) engines attain take­off power at less than full throttle, while some turbocharged engines attain take­off power only at full throttle and others at part...

DATE: March 14, 2008 MODELS AFFECTED All Lycoming aircraft engines employing any model of Precision Airmotive RSA flow dividers. TIME OF COMPLIANCE Whenever the engine has starting difficulties in cold weather. This reprint is current at the time Lycoming Service Instruction No. 1518 is issued. However, when complying with this Service Instruction, insure that compliance is in accordance with the...

Supersedes Service Instruction No. 1481A February 8, 2008 MODELS AFFECTED All Lycoming reciprocating aircraft engines stored in Lycoming Engine packaging and not in active or stored aircraft. TIME OF COMPLIANCE Not applicable. New, rebuilt, and overhauled engines purchased from Lycoming are preserved for either 60 or 180 days. The date of preservation is the date printed on the sticker on the...

Supersedes Service Instruction No. 1148C October 12, 2007 MODELS AFFECTED All Lycoming engines using float type carburetors. TIME OF COMPLIANCE During engine operation. Under certain moist atmospheric conditions (generally at a relative humidity of 50% or greater) and at temperatures of 20° to 90°F it is possible for ice to form in the induction system.

Supersedes Service Instruction No. 1080B June 15, 2007 MODELS AFFECTED All Lycoming opposed series aircraft engines. TIME OF COMPLIANCE During periodic inspection of the engine. It has been determined that careful inspection and maintenance at precise, specified intervals will contribute immeasurably to the life of the engine and the avoidance of eventual damage or failure of the engine. It is the...