DATE: October 31, 2011 MODELS AFFECTED All Lycoming engines with counterweights installed. TIME OF COMPLIANCE As required. This Service Instruction contains procedures and dimensions to remove, inspect, and install counterweights and rollers for Lycoming engine crankshafts.

Supersedes Service Instruction No. 1497 April 12, 2011 MODELS AFFECTED Lycoming IO-360-L2A engines installed in Cessna C172R and 172S aircraft used in training operations TIME OF COMPLIANCE As required during aircraft operations The flight training environment makes an engine more susceptible to spark plug fouling, decreased efficiency, and excessive fuel consumption. Some of the flight training...

Supersedes Service Instruction No. 1484B March 29, 2011 MODELS AFFECTED All Lycoming reciprocating aircraft engines TIME OF COMPLIANCE When installing a fuel metering device, carburetor, fuel injector servo or “AN” fuel pump This Service Instruction includes the steps and torque values for installation of a fuel metering device, carburetor, fuel injector servo or “AN” fuel pump.

Supersedes Service Instruction No. 1442 March 28, 2011 MODELS AFFECTED All Lycoming piston engines with dual magneto accessory housing TIME OF COMPLIANCE At next overhaul or evidence of a filter element collapse This Service Instruction identifies a new spring, P/N 05S21021 that replaces spring P/N 55C21021 in the oil filter bypass valve. This replacement is to be done during overhaul or if oil...

Supersedes Service Instruction No. 1489B March 9, 2011 MODELS AFFECTED IO-360-L2A model engines installed in Cessna 172R and 172S aircraft; IO- 540-AB1A5 model engines installed in Cessna 182 aircraft; IO-540-AC1A5 model engines installed in Cessna 206 aircraft; TIO-540-AJ1A model engines installed in Cessna T206 aircraft with a 2 psi fuel flow divider spring (with detail P/N 2576532-1 or 2576556...

Supersedes Service Instruction No. 1420 February 25, 2011 MODELS AFFECTED All Lycoming reciprocating aircraft engines with AN type gear driven fuel pump TIME OF COMPLIANCE Any time the pump is installed. To decrease wear on the fuel pump drive spline, it is recommended that Castrol Contractor Special NLGI #1 or greases shown in the latest revision of Service Instruction No. 1059 be applied to the...

Supersedes Service Instruction No. 1508B February 10, 2011 MODELS AFFECTED All Lycoming engines with dual magnetos TIME OF COMPLIANCE At the next oil change, not to exceed 50 hours of engine operation or at each magneto timing check or service This Service Instruction identifies the necessary steps to install new clamps on dual magnetos to securely attach a Teledyne/Bendix or other dual magneto to...

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...