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Selected Textron Lycoming. Last updated Feb 25, 1998

Service Bulletins

• 240N (Mandatory Parts Replacement at overhaul)
• 245D (Counterweight Detuning)
• 301B (Maintenance and service for valves
• 359 (Spark Plug change on O-235)
• 369I (Inspection after overspeed)
• 381C (Oil Pump Woodruff Key Drive)
• 385C (Oil Pump Impeller Replacement)
• 388B (Determining Exhaust Valve and Guide Condition)
• 398 (Recommendation Regarding Use of Incorrect Fuel)
• 401 (Recommendation for Aircraft Struck by Lightning)
• 404 (Exhaust Valve Inspection (High Lead Fuel Operation))
• 406A (Titan fuel pump inspection)
• 411B (Adapter Kit for Magneto Isolation Drive)
• 425C (TCM MSB 645 (magneto impulse coupling))
• 439A (Inspection of Connecting Rods for Fretting)
• 453D (Push Rods on O-235 Series Engines)
• 455D (Replacement of Oil Pump Impellers)
• 456F (Replacement of Sintered Iron Oil Pump Impellers)
• 480 (Oil and Filter Change and Cleaning)
• 488A (Propellor Governor Line Support)
• 505B (Inspection of Crankshaft ID for Corrosion)
• 518C (Inspection of Thermostatic Bypass Valves)
• 522 (Inspection of Push Rods [O-235])
• 524 (Replacement of Sintered and Aluminum Oil Pump Impellers)
• 525A (Mandatory Inspection of Certain Fuel Pumps)
• 526 (TCM D-2000 and D-3000 magneto impulse couplings)
• 527C (Replacement of certain piston pins)
• 528 (TCM SB658 (S-20, S-200, S-1200, D-2000, and D-3000 magnetos))
• 529 (Crane/Lear Romec SB 101SB020 (rotary fuel pumps))
• 530 (Application of Protective Coating on Crankshaft ID (terminating condition for crankshaft ID corrosion))

Service Instructions

• 1009AK (Recommended Time Between Overhauls)
• 1014M (Lubricating Oil Recommendations)
• 1042T (Approved Spark Plugs)
• 1060G (Push Rod Identification)
• 1068A (Valve adjustment on solid-lifter engines)
• 1070L (Specified Fuels)
• 1080A (Maintenance Items for Special Attention)
• 1094D (Leaning Procedures)
• 1098F (Prop Bushing Locations)
• 1154F (FAA Approved Starters, Generators, Alternators, Regulators, and Relays)
• 1187H (Turbocharger Density Controller Adjustment)
• 1191 (Compression Testing)
• 1241C (Preoiling Prior to Initial Start)
• 1243 (Piston Identification)
• 1256 (Valve Guides for Service Use)
• 1267B (Piston Pin Plug Usage)
• 1285A (Magnetic Particle Inspection)
• 1290D (Repair of Oil Leakage at Crankcase Thru-Stud Locations)
• 1341A (Oil Pump Shaft Lubrication)
• 1388C (Trouble Shooting the O-235 [NOTE: has good general troubleshooting info])
• 1392 (Cold Weather Operation (esp O-320-H))
• 1422A (Exhaust System Inspection)
• 1438 (Application of Propeller Governor Gaskets)
• 1479A (Oil Cooled Exhaust Valve Guides for the TIO-540-AF1A/B (Mooney TLS))
• 1480 (Installation of Steel Pushrods)
• 1481 (Factory Engine Preservation)
• 1483 (Valve Leak Check)

Service Letters

• 163C (Recommendations after prop strike)
• 171 (Use of Spectrographic Oil Analysis)
• 180A (Engine Preservation for Active and Stored Engines)
• 185B (Use of 100LL in 80/87 engines)
• 192B (Spark Plug Fouling)
• 197A (Recommendations to avoid valve sticking)
• 220A (Non-availability of new narrow deck engines)
• 229B (Use of Mobil 1 dis-approved)

Note that I'll add more here as time permits. I'm currently experimenting with various different formats and scanning techniques. If you have any suggestions or wish to see any particular Lycoming publication then send me email and I'll see if I can put it up.

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