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Lycoming Home > Support > Publications > Service Bulletins
Service Bulletins
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.
Service Bulletin SB-581
Reprint of Precision Airmotive MANDATORY Service Bulletin Nos. PRS-107, Rev. 1 and PEX-1
SB-580
Reprint of Kelly Aerospace Service Bulletin No. 029
SB-579
Clearance Between Oil Sump Assembly and Oil Sump Baffle
SB-578
Incorrect Cylinder Assemblies Shipped With Cylinder Kits
SB-577
Sky-Tec PM Model Starter Replacement
SB-576
Reprint of Teledyne Continental Ignition Systems Service Bulletin No. SB 633A
SB-574A
Cylinder Stud Hole Cross-Threaded
SB-573
Pressurized Magneto Pressure Tests
SB-573S-1
Supplement to Pressurized Magneto Pressure Tests
SB-572
Missing Oil Passage Hole at Idler Shaft Location
SB-571
Reprint of Sky-Tec Service Bulletin No. 2006-3-1 (Replacement of Specified Sky-Tec Starters - Model 31B22101/149-24PM)
SB-569A
Crankshaft Retirement for Certain Lycoming Engines
SB-568
Reprint of Slick Aircraft Products Service Bulletin No. SB1-88B
SB-566S-1
Additional 360 Engines with Suspect Crankshafts
SB-566
Crankshaft Replacement in Lycoming Engines
SB-565
Diaphragm-Type Fuel Pump Inspection/Replacement
SB-564
Inspection of Suction Screen Length
SB-561
Connecting Rod Bearing Replacement on (L)TIO-540-U2A, -V2AD, and -W2A Engines
SB-559
Reprint of Kelly Aerospace Power Systems (Formerly Electrosystems) S.B. No A-112, Rev. A
SB-558
Inspection of Oil Suction Screen Airea in IO-540-AE1A5 Oil Sump for Casting Voids
SB-557
Fuel Injector, Precision Airmotive Corp. Service Bulletin No. PRS-105, "Servo Metered Fuel Pressure Port Leakage"
SB-556
P/N LW-11201 Washer, Replacement
SB-555A
Inspection, Oil Pump Body Plug
SB-554S-5
Supplement No. 5 to S.B. 554
SB-554S-4
Supplement No. 4 to S.B. 554
SB-554S-3
Supplement No. 3 to S.B. 554
SB-554
Bolt, Crankshaft Gear Retaining, Replacement
SB-553S-1
Supplement No. 1 to Service Bulletin No. 553
SB-553
Crankshaft Inspection for Lycoming Six Cylinder Turbocharged Engines (Refer to Supplement No. 1 to S.B. 553)
SB-552S-1
Supplement No. 1 to Service Bulletin No. 552
SB-552
Crankshaft Replacement in Lycoming TIO and LTIO-540 Engines Rated at 300 Horsepower and Higher (Refer to Supplement No. 1 to S.B. 552)
SB-549S-1
Supplement No. 1 to Service Bulletin No. 549
SB-549
Crankshaft/Engine Inspection (Refer to Supplement No. 1 to S.B. 549)
SB-548A
Diaphragm-Type Fuel Pump Inspection/Replacement
SB-547S-1
Supplement No. 1 to Service Bulletin No. 547
SB-547
Bearing Replacement, Connecting Rod on TIO-540-AE2A Model Engines (Refer to Supplement No. 1 to S.B. 547)
SB-545A
Filler Tube, Oil, Replacement
SB-544B
Bearing Replacement, Part Identification
SB-543B
Converter Plate Gasket, Oil Filter, Replacement
SB-539A
Fuel Pump, Lear Romec Service Bulletins No. RG9080-73-001, No. RG9570-73-001, and No. RG17980-73-001, "Replacement of Valve Housing and Related Seals"
SB-533A
Engine Stoppage, Recommendations Regarding Accidental
SB-530B
Coating, Protective, Application on Crankshaft
SB-529B-1
Fuel Pump, Lear Romec Service Bulletin No. 101SB020, "Torquing of Relief Valve Cover Screws"
SB-524S-1
Supplement No. 1 to Service Bulletin No. 524
SB-524
Aluminum and Sintered Iron Oil Pump Impellers, Replacement (Refer to Supplement No. 1 to S.B. 524)
SB-505B
Crankshaft ID, Inspection for Corrosion
SB-480E
I. Oil and Filter Change and Screen Cleaning II. Oil Filter/Screen Content Inspection
SB-475C
Crankshaft Gear Modification and Assembly Procedures
SB-398
Fuel, Recommendations Regarding Use of Incorrect
SB-388C
Exhaust Valve and Guide, Procedure to Determine Condition (Refer to to S.B. 388)
SB-369J
Engine Inspection After Overboost/Overspeed
SB-342E
Fuel Line and Support Clamp Inspection and Installation
SB-366B
Carburetor Throttle Body Screw Inspection
SB-240T
Parts Replacement, Mandatory, at Normal Overhaul and During Repair or Normal Maintenance
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