DATE: February 6, 2014 MODELS AFFECTED Table A in the attached Service Bulletin. TIME OF COMPLIANCE Next maintenance event not to exceed 50 hours or before further flight if fuel leak found during preflight inspection. In response to field reports of leaking Hartzell Engine Technologies’ (HET’s) fuel pump, Lycoming Engines requires replacement of all fuel pumps identified in Tables A and B with a...

March 26, 2013 MODELS AFFECTED All Lycoming direct drive aircraft engines TIME OF COMPLIANCE Before continued operation of an engine that had sudden stoppage This Service Bulletin applies to instructions for a bent crankshaft flange. Lycoming Engines no longer allows bent crankshaft flanges to be ground or repaired to restore maximum run-out. As per Service Bulletin 533B, if the crankshaft is bent...

DATE: November 21, 2012 MODELS AFFECTED New, rebuilt, or overhauled Lycoming TIO­540­AK1A engine models in Table 1 Lycoming engine models field­overhauled or repaired with model TAO411, P/N 410188­019 turbocharger turbine wheel. TIME OF COMPLIANCE Before further flight. This Service Bulletin is notification for mandatory compliance with HET’s Alert Service Bulletin No. 048 dated 11/16/2012...

DATE: October 9, 2012 This Supplement No. 1 is to clarify terms in the revised last paragraph of the NOTE on page 2 of Lycoming Engines' Service Bulletin No. 603, dated October 4.

August 31, 2012 This supplement to Service Bulletin No. 543C is for clarification of Option 2 on Page 2: the new oil filter converter plate gasket does not have a pre­stamp of 543. There is no need to vibropeen 543 on the converter plate. The part number is visible with the plate installed.

DATE: March 14, 2012 MODELS AFFECTED New, rebuilt, or overhauled Lycoming engine models in Table A manufactured between May, 2010 and February, 2012 including those Lycoming engine models on Lycoming Special Advisory Nos. SA­103­611 (June 13, 2011) and SA­109­312 (March 7, 2012) with HET 201F series fuel pump installed. Lycoming engine models field­overhauled or repaired with HET series 201F fuel...

DATE: March 8, 2012 MODELS AFFECTED IO­540­AB1A5 or its applicable crankshaft that had propeller flange bushings replaced in the field in accordance with Service Instruction No. 1098G. This Service Bulletin applies only to Lycoming engine model IO­540­AB1A5 and applicable crankshafts that had the propeller flange bushings replaced in the field in accordance with Service Instruction No. 1098G. This...

DATE: November 22, 2011 MODELS AFFECTED Refer to Tables 1, 2, and 3. TIME OF COMPLIANCE At the next scheduled maintenance event or within the next 50 hours, not to exceed 12 months from the date of this Service Bulletin. This Service Bulletin is notification of required action for non-compliant oil fill tubes P/N 77527 sent from Lycoming Engines from May 17, 2011 to November 4, 2011. The inner...

Supersedes Service Bulletin No. 598 June 1, 2011 MODELS AFFECTED Lycoming engines, identified in Table 1, and spare clamps shipped from Lycoming between December 27, 2010 and May 25, 2011. TIME OF COMPLIANCE Before next flight, immediate inspection of engines (in Tables 1 and 2) that have not already been operated and have proven thermal stability at high power OR Within 10 hours of engine...