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Service Bulletin No. 240AA
Service Bulletin No. 240AA (Supersedes Service Bulletin No. 240W) June, 2025 MODELS AFFECTED: All Lycoming reciprocating aircraft engines TIME OF COMPLIANCE: As specified
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Service Bulletin No. 663
Service Bulletin No. 663 July, 2025 MODELS AFFECTED: GO-435 Series GO, GSO, IGO, IGSO-480 Series (Except GO-480-B1A6 with the following Engine S/N’s: L-567-28, L-569-28, L-573-28, L-574-28, L-575-28, L-576-28) VO, IGO, IGSO-540 Series TIO, TIGO-541 Series TIME OF COMPLIANCE: Before further flight
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Service Instruction No. 1594
Service Instruction No. 1594 DATE: July, 2025 MODELS AFFECTED: Lycoming O-235 Engine Models listed in Table 1 TIME OF COMPLIANCE: During every scheduled maintenance event
STD-1216
INSERT-.375-16 UNC X .562 LONG
Revision
-B
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Service Bulletin No. 342 H
Service Bulletin No. 342 H Date: July, 2025 SUBJECT: Fuel Line (Stainless Steel Tube Assy.) and Support Clamp Inspection and Installation. MODELS AFFECTED: All fuel injected Lycoming engines indicated in fuel line and clamping diagrams. TIME OF COMPLIANCE: Examine fuel lines every 100 hours, annual inspection, overhaul and any time fuel lines or clamps are serviced, removed, or replaced.
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Service Instruction No. 1037AA
Service Instruction No. 1037AA Date: July, 2025 SUBJECT: Approved Pistons, Rings, Cylinders, and Gasket Set Application for Use on Lycoming Aircraft Engines MODELS AFFECTED: All Lycoming opposed series aircraft engines in Table 1. TIME OF COMPLIANCE: When installing new rings, pistons, valves and cylinders.
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Special Service Publication No. 110-3
Special Service Publication No. 110-3 SSP-110-3 Date: July, 2025 CERTIFICATED AIRCRAFT ENGINES
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Special Service Publication No. 112-15
Special Service Publication No. 112-15 SSP-112-15 Date: July, 2025 Updated list of Service Bulletins, Letters, and Instructions.
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Service Instruction No. 1304 K
Supersedes Service Instruction No. 1304 J August, 2025 MODELS AFFECTED All Lycoming aircraft engines. TIME OF COMPLIANCE When a data plate is lost, contains incorrect information, becomes illegible, or an engine modification affects model designation.
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Clay Isbell
Clay Isbell is the Director of Supply & Planning at Lycoming Engines. Since joining Textron Systems in 1990, Clay has held progressive leadership roles in Supply Chain, including Sr. Manger, Warehouse & Logistics, and Sr. Manager, Production, Planning & Control. Prior to joining Lycoming Engines, Clay was most recently the Principle Business Operations Analyst/Master Scheduler for both Sea and...