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...

DATE: February 21, 2005 MODELS AFFECTED New, rebuilt and overhauled engines shipped from Lycoming between October 1, 2001 and February 2, 2004 with fuel pump P/N LW-15473. Engine models affected are IO-320, -360, -540; AIO-320, -360; AEIO-320, -360, - 540; HIO-360; TO-360-C1A6D, -F1A6D and O-540-L3C5D. Fuel pumps replaced in the field with a genuine Lycoming fuel pump after October 1, 2001 and up...

October 17, 2008 MODELS AFFECTED All Lycoming new, overhauled, rebuilt, or repaired engines with: 1. A Slick model 4200/4300/6200/6300 series magneto with a serial number beginning with 0409#### through 08080453. 2. A LASAR model 4700/6700 series magneto with a serial number beginning with 0409#### through 08080453. 3. Any magneto which has had the carbon brush or distributor block assembly...

October 5, 2015 MODELS AFFECTED IO-320, -360, -390, -540, -580; AEIO-320, -360, -390, -540; LIO-320-B1A; O-320-B2D, -D1D; (L)O-360-A1H6, -A1N6, -A1G6D; HIO-360; LIO-360; O-360-A1H, -A2G, -A4G, -A4J, -A4K, -A1G6, -C1F, -C4F; O-540-L3C5D; and TO-360-C1A6D TIME OF COMPLIANCE 50 hours from the issue date of this Service Bulletin or the next regularly scheduled maintenance event (whichever occurs first...

August 16, 2016 MODELS AFFECTED All Lycoming engines with thermostatic oil cooler bypass valves: Part number (P/N) 53E19600 (with thermostatic oil cooler bypass valve serial numbers less than 53788), P/N 75944, P/N LW-13230, and P/N 53E19980 (with thermostatic oil cooler bypass valve serial numbers less than 159) TIME OF COMPLIANCE At the next oil change, not to exceed 50 hours, then annually...

June 17, 2016 MODELS AFFECTED All Lycoming engines equipped with Fuel Pump Part Number 62D26030, 62D26032, 62D26034, 62D26035, 62D26036, or 62D26037. TIME OF COMPLIANCE At the next regularly scheduled inspection or twelve (12) months after the effective date of this Service Bulletin (whichever occurs first.) This Service Bulletin is notification of required action for mandatory compliance with...