Lycoming tests every engine that rolls off our assembly line. We take them into one of our test cells, attach a propeller and appropriate sensors, and then operate them through a range of tests. These tests can last from an hour up to four hours. We also use our test cells to evaluate components and new products. Every year we do this for about 3000-4000 engines. Lycoming purchases and consumes a...

August 31, 2005 MODELS AFFECTED New, rebuilt and overhauled engines from Lycoming with fuel pumps P/N LW-15399, LW-15472, LW-15473, and LW-16335 shipped between February 1, 2000 and September 15, 2005. Engine models affected are O- 235; O-290; O-340; (L)O and IO-320, -360, -540; AIO-320, -360; AEIO-320, -360, -540; HO-360; HIO-360; and TO-360. Fuel pumps P/N LW-15399, LW-15472, LW-15473, and LW...

October 10, 2014 MODELS AFFECTED Lycoming Engine Model TIO-540-AJ1A with a Serial Number Identified in Table 1 or any TIO-540-AJ1A with a Turbocharger Mounting Bracket Purchased as a Spare between April 5, 2012 and May 29, 2014 TIME OF COMPLIANCE The Required Action must be completed within the next 25 hours or next scheduled maintenance event (whichever occurs first) for: Engines identified in...

DATE: March 6, 2014 MODELS AFFECTED New, rebuilt, or overhauled Lycoming engine models and spares identified in Tables 1 and 2 in the attached bulletin. Lycoming turbocharger P/N’s LW­12463, LW­13987, and LW­18470 fieldoverhauled or repaired with back plate (HET) P/N 406795­0058 (Refer to the latest revision of (HET) Alert Service Bulletin No. 057.) TIME OF COMPLIANCE Refer to the “Compliance”...

DATE: October 4, 2012 MODELS AFFECTED All Lycoming engines in Table 1 (in the attached bulletin) equipped with Slick 4200/6200 or 4300/6300 series Impulse and Direct Drive magnetos. TIME OF COMPLIANCE As required by Slick SB1­-12. This Service Bulletin is notification of required action for mandatory compliance with Slick Service Bulletin No. SB1­12 dated 9/6/2012, regarding Lycoming engine models...

May 27, 2009 Supplement No. 1 to Service Bulletin No. 569A is being issued to correct an inconsistency between the engine models and spare crankshafts in the “Models Affected” section on Page 1 and the start date referenced for these stated items.

DATE: March 27, 2006 MODELS AFFECTED Lycoming aircraft engines equipped with Slick Aircraft Products pressurized magnetos called out in Slick Aircraft Products Service Bulletin No. SB1-88B. TIME OF COMPLIANCE Same as required for Slick Aircraft Products Service Bulletin No. SB1-88B. This reprint is current at the time Lycoming Service Bulletin No. 568 is issued. However, when complying with this...

February 27, 2012 MODELS AFFECTED All Lycoming engines employing Bendix RS or RSA fuel injector systems TIME OF COMPLIANCE As required by subject Service Bulletin This Service Instruction includes a reprint of Bendix Service Bulletin No. RS­77, Rev. 2 which was issued to correct part numbers.

July 21, 2016 MODELS AFFECTED All O-320, IO-320, O-340, O-360, IO-360, VO-360, HIO-360, IVO-360, O- 540, IO-540, IO-720, and TIO-541 engines that do not have a Thermostatic Oil Cooler Bypass Valve Assembly installed TIME OF COMPLIANCE Optional, at owner's discretion REASON FOR REVISION Updated required parts in Table 1; clarified procedure This Service Instruction includes a procedure to install a...