Service Bulletins

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Service Bulletins

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In the event that Lycoming issues a Service Bulletin, compliance is required within the compliance time stated for the affected models listed on the bulletin. Service Bulletins, readily identified by the "Mandatory" heading printed in red, provide instructions or procedures that must be observed for safety reasons.

Service Bulletins are available from Lycoming Distributors. Complete sets of Service Bulletins, Instructions and Letters are available for purchase in both hard copy and electronic form either directly from Lycoming or through a Lycoming Distributor.

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NumberDateSorted By Date In Descending OrderTitle
SB 530B Supplement 110/10/2014Supplement No. 1 to Service Bulletin 530B
SB 614A10/10/2014Exhaust System Inspection and Turbocharger Mounting Bracket Replacement
SB 593A7/23/2014Intake Valve P/N 17A23942 Inspection for Date Stamp
SB 6133/6/2014Compliance with Hartzell Engine Technologies (HET), LLC
SB 6062/13/2014Correction of Engine Data Plate on IO-540-AE1A5 Engines
SB 6082/6/2014Replacement of Hartzell Engine Technologies' Fuel Pump Assemblies
SB 342G Supplement 21/23/2014Supplement 2 to Service Bulletin No. 342G - Fuel Line and Support Clamp Inspection and Installation
SB 342G Supplement 18/29/2013Supplement 1 to Service Bulletin No. 342G - Fuel Line and Support Clamp Inspection and Installation
SB 342G7/16/2013Fuel Line and Support Clamp Inspection and Installation
SB 201F3/26/2013Inspection of Crankshaft Flange
SB 60411/21/2012Compliance with Hartzell Engine Technologies, LLC Alert Service Bulletin No. 048 dated 11/16/2012, Turbocharger model TAO411, P/N 410188-0019 Turbine Wheel Replacement
SB 603 Supplement 110/9/2012Reprint of Slick Service Bulletin SB1-12 Supplement 1
SB 533B10/4/2012Recommended Action for Sudden Engine Stoppage, Propeller/Rotor Strike or Loss of Propeller/Rotor Blade or Tip
SB 60310/4/2012Reprint of Slick Service Bulletin SB1-12
SB 543 C Supplement 18/31/2012Oil Filter Converter Plate Gasket Replacement Supplement 1
SB 369L4/18/2012Engine Inspection after Overspeed
SB 5993/14/2012Compliance with Hartzell Engine Technologies, LLC Service Bulletin No. 045, 201F Fuel Pump Inspection and Recall
SB 6023/8/2012Incorrect Part Numbers on Service Instruction No. 1098G
SB 240 W2/23/2012Mandatory Parts Replacement at Overhaul and During Repair or Maintenance
SB 60111/22/2011Non-Compliant Oil Fill Tubes P/N 77527
SB 598A6/1/2011V-Band Clamp P/N LW-12125-3 and LW-12093-6 on Turbocharged Engines
SB 595 5/6/2011Torque Values for Screws that Attach Ignition Harness Attachment Plate
SB 5975/4/2011Fuel Drain Valve Adapter Assembly P/N LW-13807
SB 5964/27/2011Reprint of AVStar Mandatory Service Bulletin AFS-SB6 Revision 2
SB 5941/10/2011Reprint of Hartzell Engine Technologies LLC Mandatory Service Bulletin 040A
SB 398B11/22/2010Recommended Corrective Action for Use of Incorrect Fuel
SB 5929/29/2010Engine Inspection after Overboost
SB 543C9/29/2010Oil Filter Converter Plate Gasket Replacement
SB 5938/24/2010Intake Valve Inspection for Date Stamp
SB 399A7/9/2010Action to Take if Loss of Oil Pressure
SB 591A5/10/2010Reprint of Kelly Mandatory Service Bulletin No. 039A, Turbine Wheel Replacement
SB 411C12/15/2009Adapter Kit for Magneto Isolation Drive
SB 582A Supplement 112/15/2009Reprint of Precision Airmotive Mandatory Service Bulletin No. MSA-13 Supplement 1
SB 590A11/13/2009Use of Aircraft Boost Pump with Kelly Aerospace 200F Series Fuel Pumps
SB 569A Supplement 15/27/2009Crankshaft Retirement for Certain Lycoming Engines Supplement 1
SB 5853/17/2009Incorrect Exhaust Valve Rotator Cap Shipped with Cylinder Kits P/N 05K21119, 05K21121, and 05K21122
SB 471B2/20/2009Lycoming Engines Oil Additive P/N LW-16702
SB 581A11/19/2008Reprint of Precision Airmotive Mandatory Service Bulletin Nos. PRS-107, Rev. 4 and PEX-1, Rev. 1
SB 584B10/17/2008Reprint of Mandatory Unison Service Bulletin No. SB3-08A
SB 582A10/10/2008Reprint of Precision Airmotive Mandatory Service Bulletin No. MSA-13
SB 577A9/19/2008Reprint of Sky-Tec Service Bulletin No. 07-01, Rev. D
SB 564A8/22/2008Inspection of Suction Screen Length
SB 583A7/21/2008Reprint of Mandatory Unison Service Bulletin No. SB2-08
SB 446E7/18/2008The Use of Lycoming LW-16702 Oil Additive
SB 366B4/18/2008Carburetor Throttle Body Screw Inspection
SB 5802/15/2008Reprint of Kelly Aerospace Service Bulletin No. 029
SB 57911/16/2007Clearance Between Oil Sump Assembly and Oil Sump Baffle
SB 5789/21/2007Incorrect Cylinder Assemblies Shipped with Cylinder Kits
SB 5769/21/2007Reprint of Teledyne Continental Ignition Systems Service Bulletin No. SB633A
SB 574A7/20/2007Cylinder Stud Hole Cross-Threaded
SB 573 Supplement 13/16/2007Pressurized Magneto Pressure Tests Supplement 1
SB 5732/23/2007Pressurized Magneto Pressure Tests
SB 57210/30/2006Missing Oil Passage Hole at Idler Shaft Location
SB 544B10/6/2006Bearing Replacement - Part Identification
SB 5715/5/2006Reprint of Sky-Tec Service Bulletin No. 2006-0-3-1
SB 569A4/11/2006Crankshaft Retirement for Certain Lycoming Engines
SB 5683/27/2006Reprint of Slick Aircraft Products Service Bulletin No. SB1-88B
SB 566 Supplement 111/30/2005Crankshaft Replacement in Lycoming Engines Supplement 1
SB 548A8/31/2005Diaphragm-Type Fuel Pump Inspection/Replacement
SB 5667/11/2005Crankshaft Replacement in Lycoming Engines
SB 480E 4/13/2005Oil and Filter Change and Screen Cleaning; Oil Filter/Screen Content Inspection
SB 5652/21/2005Diaphragm-Type Fuel Pump Inspection/Replacement
SB 530B11/22/2004Application of Protective Coating on Crankshaft
SB 388C11/22/2004Procedure to Determine Exhaust Valve and Guide Condition
SB 5618/6/2004Connecting Rod Bearing Replacement on TIO-540-U2A, -V2AD, and -W2A Engines
SB 5593/23/2004Reprint of Kelly Aerospace Power Systems Service Bulletin No. A-112, Rev. A
SB 55811/17/2003Inspection of Oil Suction Screen Area for Casting Voids
SB 554 Supplement 58/15/2003Crankshaft Gear Retaining Bolt Replacement Supplement 5
SB 555A5/16/2003Oil Pump Body Plug Inspection
SB 5575/7/2003Reprint of Precision Airmotive Corporation Service Bulletin No. PRS-105
SB 547 Supplement 14/28/2003Connecting Rod Bearing Replacement on TIO-540-AE2A Model Engines Supplement 1
SB 554 Supplement 44/2/2003Crankshaft Gear Retaining Bolt Replacement Supplement 4
SB 475C1/30/2003Crankshaft Gear Modification and Assembly Procedures
SB 5561/29/2003Replacement of Washer P/N LW-11201
SB 553 Supplement 112/16/2002Crankshaft Inspection for Lycoming Six Cylinder Turbocharged Engines Supplement 1
SB 554 Supplement 311/12/2002Crankshaft Gear Retaining Bolt Replacement Supplement 3
SB 5549/30/2002Crankshaft Gear Retaining Bolt Replacement
SB 5539/16/2002Crankshaft Inspection for Lycoming Six Cylinder Turbocharged Engines
SB 552 Supplement 19/5/2002Crankshaft Replacement in Lycoming TIO and LTIO-540 Engines Rated at 300 Horsepower and Higher Supplement 1
SB 5528/16/2002Crankshaft Replacement in Lycoming TIO and LTIO-540 Engines Rated at 300 Horsepower and Higher
SB 529B6/10/2002Reprint of Crane/Lear Romec Service Bulletin No. 101SB020, Rev. 3
SB 549 Supplement 110/5/2001Engine/Crankshaft Inspection Supplement 1
SB 545A10/2/2001Oil Filler Tube Inspection-Replacement; Kit Installation Modification
SB 5493/23/2001Engine/Crankshaft Inspection
SB 5473/7/2001Connecting Rod Bearing Replacement on TIO-540-AE2A Model Engines
SB 539A11/22/2000Reprint of Crane/Lear Romec Service Bulletins No. RG9080-73-001, No. RG9570-73-001, and No. RG17980-73-001
SB 505B12/1/1997Inspection of Crankshaft I.D. for Corrosion
SB 524 Supplement 11/18/1996Replacement of Sintered Iron Oil Pump Impellers; Replacement of Aluminum Oil Pump Impellers Supplement 1
SB 5249/1/1995Replacement of Sintered Iron Oil Pump Impellers; Replacement of Aluminum Oil Pump Impellers