June 28, 2016 MODELS AFFECTED Lycoming O, IO, AEIO-360 or O, IO, AEIO-320 series engines presently equipped with impulse coupling magnetos. TIME OF COMPLIANCE At owner’s discretion REASON FOR REVISION Added engine models to “MODELS AFFECTED”; clarified details in the text of this Service Instruction. This Service Instruction contains instructions to replace impulse coupling magnetos on affected...

June 17, 2016 MODELS AFFECTED Lycoming engine models TIO-540-S1AD, IO-540-K1G5, and IO-540-K1G5D TIME OF COMPLIANCE When necessary to replace engine mounting brackets REASON FOR REVISION Part number corrections in Table 1 This Service Instruction identifies part numbers for replacement sets of engine mounting brackets for Lycoming engine models TIO-540-S1AD, IO-540-K1G5 and IO-540-K1G5D in Piper...

June 1, 2016 MODELS AFFECTED All AEIO-320, -360, -390, -540 and -580 Aerobatic series engines TIME OF COMPLIANCE Every 300 hours of operation or any time there is evidence of oil discharge from the breather. REASON FOR REVISION Added 390 and 580 engine models and clarification. This Service Instruction identifies necessary routine maintenance to be done on the inverted oil system of aerobatic...

DATE: February 23, 2012 MODELS AFFECTED Engines that used tappet P/N 15B26064. TIME OF COMPLIANCE At next overhaul, whenever tappet replacement is necessary, or earlier at owner’s discretion. This Service Instruction is notification that tappet P/N 15B26262 is now an approved replacement for tappet P/N 15B26064. For specific engine application, refer to the latest revision of Service Instruction...

February 1, 2012 MODELS AFFECTED All 320, 360, 390, 540, 580, IO­720 Direct Drive Series Engines with Two Individual Magnetos All 235 Engines with the Accessory Housing Machined for Oil Cooler Installation TIME OF COMPLIANCE At owner’s discretion This Service Instruction identifies remote­mounted oil filter kits for installation on specified Lycoming engines.

DATE: December 13, 2011 Reason for Revision This Supplement No. 1 is being issued to inform owners and operators of the following corrected metric values for Figure 2 Circlip Identification and Table 4 Gage Dimensions (Figure 4.)

February 25, 2011 MODELS AFFECTED All Lycoming engines incorporating parallel valves except O­235 Series, O­290 Series, O­320­H Series and TO­360­E Series. TIME OF COMPLIANCE Anytime valve rocker assemblies are removed. This Service Instruction identifies Rocker Arm Assembly P/N 17F19357 to be installed on the parallel intake and exhaust valves on all cylinders. Rocker Arm Assembly P/N 17F19357...

March 16, 2007 Models Affected Supplement No. 1 to Service Instruction No. 1308E is being issued to revise troubleshooting information for the following engine models and aircraft: TIO-540-AE and –AH series engines installed on Piper aircraft. TIO-540-AF series engines installed on Mooney aircraft. TIO-540-AG series engines installed on Commander aircraft.

February 2, 2007 MODELS AFFECTED Lycoming TIO-540-A2B, -A2C; (L)TIO-540-F, -J, -V, -R, -U, -W, -AE, -AF, -AG, -AH, -AJ, -AK; TIGO-541; IO-720-B1B and IO-720-B1BD series engines. TIME OF COMPLIANCE At intervals not to exceed 100 hours and anytime magneto is removed or replaced. The Model 11-10090 Air Flow Tester is available for testing the pressurization system of the Bendix 1200, D3000, D3200 and...