Supersedes Service Instruction No. 1192 September 29, 2010 MODELS AFFECTED TIO and TIGO­541­E Series Engines TIME OF COMPLIANCE Anytime valve springs are removed or installed The valve spring compressor, No. ST­25 used for all models of Lycoming engines cannot be used on the TIO­541­E series or the TIGO­541­E series engines because of the difference in the space between the valve rocker shaft and...

Supersedes Service Instruction No. 1299A September 24, 2010 MODELS AFFECTED O-360 with serial numbers up to and including 19774-36A. IO-360 with serial numbers up to and including 13275-51A. LIO-360 with serial numbers up to and including 1062-67A. O-540 with serial numbers up to and including 17269-40. IO-540 with serial numbers up to and including 12775-48. TIO-540 with serial numbers up to and...

Supersedes Service Instruction No. 1453A September 24, 2010 MODELS AFFECTED All Lycoming dual magneto engines and TIO-541-E and TIGO-541 series engines. TIME OF COMPLIANCE At engine overhaul when converter plate is removed or when the oil filter is removed between overhauls. This Service Instruction is to be followed to replace either just the gasket P/N LW-13388 with a new gasket P/N 06B23072 or...

Supersedes Service Instruction No. 1065A and No. 1204C August 26, 2010 MODELS AFFECTED All Lycoming Engines using either V-Shaped Spiral Wound or Beaded Exhaust Flange Gaskets. TIME OF COMPLIANCE At overhaul or whenever exhaust flange gaskets are replaced. Exhaust flange gaskets made of V-shaped, spiral-wound layers of stainless steel and either a non-asbestos filler or flexible graphite are...

Supersedes Service Instruction No. 1132A June 18, 2010 MODELS AFFECTED All Lycoming Opposed Series Aircraft Engines with Magnetos. TIME OF COMPLIANCE During Pre-Flight Inspection A basic magneto drop-off check based on engine speed is typically done during the pre-flight inspection to determine the loss of engine speed that occurs when magnetos are switched from BOTH magnetos to one (LEFT or RIGHT...

DATE: June 11, 2010 MODELS AFFECTED All Lycoming new, overhauled, rebuilt, or repaired TIO-540-AE2A, IO-540- V4A5. TIME OF COMPLIANCE When upgrading to a Kelly Aerospace E-drive Starter. When replacing a starter with a Kelly Aerospace E-drive starter, there is insufficient clearance with the existing alternator bracket, P/N 07A19876. Successful installation of the Kelly Aerospace E-drive starter...

Supersedes Service Instruction No. 1238A January 6, 2010 MODELS AFFECTED Lycoming turbocharged engines. TIME OF COMPLIANCE When assembling V-band couplings to the engine. V-band couplings are employed by Lycoming on certain airframe applications such as the Piper Malibu and Saratoga or by other airframe manufacturers at various locations in turbocharger exhaust systems. They are used primarily to...

Supersedes Service Instruction No. 1246A December 15, 2009 MODELS AFFECTED O-235, O-290 series engines. TIME OF COMPLIANCE During engine overhaul or earlier at owner’s discretion. Although solid stem valves and bronze valve guides have been an ideal combination in smaller, low compression engines, operators of aircraft powered by these engines have encountered difficulties when forced to use...

Supersedes Service Instruction No. 1424 December 15, 2009 MODELS AFFECTED All Lycoming reciprocating engines using P/N 15B26066 except: O-235 series; O-320-H series; O, LO, TO, LTO-360-E series; and TIO, TIGO-541 series. TIME OF COMPLIANCE Any time new P/N 15B26066, hydraulic tappet plunger assemblies, are installed. Whenever a new plunger assembly is installed, perform the following steps to...