Lycoming Aircraft Engines Service Bulletins Collection
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Comprehensive collection of Avco and Textron Lycoming Service Bulletins covering mandatory inspections, crankshaft limits, fuel lines, valves, and magneto maintenance.
Description
Lycoming Aircraft Engines Service Bulletins Collection
This technical publication brings together essential Avco and Textron Lycoming service bulletins covering vital maintenance procedures, mandatory parts replacement schedules, structural inspection limits, and operational directives for Lycoming opposed-series aircraft engines. Technicians, aircraft owners, and overhaul facilities rely on the Lycoming Aircraft Engines Service Bulletins Collection to ensure full regulatory compliance, verify critical tolerances, and preserve engine airworthiness across routine inspections and complete overhauls.
File Details
- Manual Type: Factory Service Bulletins Collection
- Manufacturer / Brand: Avco Lycoming / Textron Lycoming
- Engine Series: Lycoming Direct Drive, Geared, and Opposed Reciprocating Aircraft Engines (O-235, O-290, O-320, O-360, IO-360, HIO-360, TIO-360, GO-480, GSO-480, IGSO-480, O-540, IO-540, TIO-540, LTIO-540, VO-540, TIO-541, TIGO-541, IO-720 series)
- Language: English
- Page Count: 799 pages
- Format: High-resolution digital PDF
IMAGES PREVIEW
Bulletins and Coverage Included
- Service Bulletin No. 113: Dry Sump Test Stand Installation for Lycoming Opposed Series Engines (fabrication and installation of spring-loaded plug, adapters, and external test stand circuit for block testing wet-sump engines)
- Service Bulletin No. 183A: Magneto Timing Discrepancies (proper timing light techniques, Time-Rite piston position indicator usage, and breaker point clearance adjustments for heavyweight magnetos)
- Service Bulletin No. 201E: Mandatory Inspection and Straightening of Bent Crankshaft Flanges (post-sudden stoppage inspection, dial indicator total indicator reading limits, flange thickness minimums, and allowable run-out tolerances)
- Service Bulletin No. 212B: Replacing Straight Thru-Studs with Necked Studs (cylinder base stud replacement criteria, driving heights, and Allen head nut modernization)
- Service Bulletin No. 222D: Mandatory Crankshaft Renitriding Requirements (overhaul regrinding thresholds, journal stress-concentration prevention, polishing limits, and prohibitions on metal spray or plating)
- Service Bulletin No. 225B: Replacement of Valve Rocker Thrust Washers (spotfacing inner rocker shaft support bosses, side clearance limits, and selection of undersize thrust washers)
- Service Bulletin No. 238: Magnetized Condition of Hydraulic Tappet Plunger Assemblies (removal techniques without magnets, non-destructive check procedures, and preventing collapsed hydraulic lifters)
- Service Bulletin No. 240R: Mandatory Parts Replacement at Normal Overhaul and During Repair or Normal Maintenance (compulsory replacement listings for fasteners, valves, guides, seals, rings, bearings, and critical rotating hardware)
- Service Bulletin No. 271A: Cylinder Painting (masking critical surfaces, dry film thickness limits for zinc chromate primer on hold-down flanges, and preventing cylinder stud torque loss)
- Service Bulletin No. 301B: Maintenance Procedures and Service Limitations for Valves (400-hour inspection procedures, face runout limits, stem wear limits, minimum intake edge thicknesses, and refacing standards)
- Service Bulletin No. 340 & 341: Bendix S-1200 Series Magneto Procedures (reprint of Bendix Service Bulletins 530A and 549, securing primary leads and inspecting distributor gear carbon brush spring shoulder recesses)
- Service Bulletin No. 342D: Mandatory Fuel Line and Support Clamp Inspection and Installation (complete 37-page inspection directive with detailed isometric clamping and routing schematics covering 4-cylinder, 6-cylinder, and 8-cylinder fuel injected engines)
- Service Bulletin No. 343B: Bendix Distributor Block Lubricant Conversion (reprint of Bendix Bulletin 551A for S-20, S-200, and S-1200 magnetos)
- Service Bulletin No. 348A: Clearance for Valve Rocker Assembly (angle valve cylinder head modifications, clearance blending to prevent pushrod binding, and identification of revised rocker arms)
- Service Bulletin No. 357: Engine Inspection in Event of Immersion (submerged engine recovery protocols, bearing inspection, and mandatory hardware renewal)
- Service Bulletin No. 367F & Supplement 1: Required Inspection of Part No. 69650 Piston Pin (magnetic particle inspection criteria, identifying approved pins, and serial number applicability tables)
- Service Bulletin No. 369I: Engine Inspection After Overspeed or Overboost (detailed percentage-based inspection charts, differential compression testing, valve train damage verification, and absolute pressure relief valve testing)
- Service Bulletin No. 370: Oil Filter Attaching Stud Replacement (identification of high-tensile AC stud with drilled center indicator and critical 20–25 ft-lb torque requirements)
- Service Bulletin No. 373 & Supplement 1: Bendix S-1200 Magneto Distributor Block Modification (reprint of Bendix Bulletin 566 for nylon and steel washer installation, lathe fixture rework specifications, and serial tracking)
- Service Bulletin No. 382: Bendix Fuel System Flow Divider Inspection (reprint of Bendix RS43 regarding cover gasket replacement and identification)
- Service Bulletin No. 388B & Supplement 1: Mandatory Exhaust Valve and Guide Condition Check (valve stem clearance checks using ST-71 and ST-310 fixtures, dial indicator adapters, shop-made tooling blueprints, and optional GO/NO-GO gage procedures)
- Service Bulletin No. 398 & 401: Fuel Contamination and Lightning Strike Directives (airworthiness checks following operation on improper aviation fuel or electrical strike events)
- Service Bulletin No. 406A: Titan Fuel Pump Inspection (retorquing cover screws and lockwire procedures on AN type pumps)
- Service Bulletin No. 410, 415A, 425C, 427A, 437, & 438A: Ignition System Bulletins (reprints of critical Bendix and TCM ignition directives for D-2000, D-2200, D-3000, and S-1200 magnetos including housing distortion checks, coil securing kits, and riveted impulse coupling wear limits)
- Service Bulletin No. 428, 433A, & 442: Bendix RSA Fuel Injection System Directives (bellows seal modifications, fuel diaphragm stem inspections, and regulator stem nut integrity checks)
- Service Bulletin No. 439A: Inspection and Repair of Connecting Rods for Fretting and Galling (critical galling zones, permissible .010-inch oversize crankpin bore grinding, machine setup spindle speeds, and weight class codes)
Together, these technical bulletins give aviation mechanics, engine rebuilders, and inspectors authoritative manufacturer guidelines that bridge standard overhaul manual instructions with specific, time-sensitive safety directives and engineering updates.
Inspection, Overhaul, and Airworthiness Capabilities
Working from the Lycoming Aircraft Engines Service Bulletins Collection equips maintenance professionals to execute precise, factory-level servicing. From setting up dry-sump run-in test cells and assessing post-prop-strike crankshaft flange run-out to performing wobble checks on high-time exhaust valve guides, this documentation eliminates guesswork. Adhering to the specific torque limits, dimensional charts, and mandatory replacement lists ensures your powerplants maintain peak operational safety and conform strictly to aviation regulatory standards.
This manual is delivered as an instant digital PDF download immediately upon checkout. You can access the document on any desktop computer, tablet, or smartphone, or print out targeted engineering diagrams and schematics for convenient use directly in the hangar or machine shop.
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