634. 632 S.B. 50lA) Engineering Aspects are FAA Approved Recall of Piston Pi Part No. Table 1 of Lycoming Mandatory Service Bulletin (MSB) 634, dated 11 October 2018, or later FAA approved revision. * DCA/LYC/224A Lycoming Parallel Valve Cylinder and Head Assemblies â Inspection Applicability: All Lycoming engines fitted with parallel valve cylinder and head assemblies listed in Table 1 of Lycoming Mandatory Service Bulletin (MSB) 634, dated 11 October 2018, or later FAA approved revision. 273 Customer Care Program, Service Bulletin No. LW-14077 MODELS AFFECTED. All Lycoming engines fitted with parallel valve cylinder and head assemblies listed in Table 1 of Lycoming Mandatory Service Bulletin (MSB) 634, dated 11 October 2018, or later FAA approved revision. Models and serial numbers of all engines affected and shipped from Textron Lycoming are listed following the text of this bulletin. Note: * DCA/LYC/224A Lycoming Parallel Valve Cylinder and Head Assemblies â Inspection Applicability: All Lycoming engines fitted with p. arallel valve cylinder and head assemblies listed in Table 1 of Lycoming Mandatory Service Bulletin (MSB) 634, dated 11 October 2018, or later FAA approved revision. Lycoming published Lycoming Mandatory Service Bulletin (MSB) No. Determine if your engine contains an affected cylinder and head assembly with the local thin wall condition using Table 1 of Lycoming MSB No. The bulletin is here (PDF). Service Bulletin No. 634 documents in the last year Economic Sanctions & Foreign Assets Control ... We have reviewed and approved the technical contents of Lycoming Engines Mandatory Service Bulletin (MSB) No. 634, under which certain parallel-valve cylinder and head assemblies shipped between 01/09/2013 and 30/04/2015 have to be retired at the nearest overhaul. inspection requirement for affected parallel valve cylinder and head assemblies, until replacement per requirement 2 of Lycoming has just issued a service bulletin No. Textron Lycoming engines. 029, dated February 1, 2008, Kelly Aerospace Power Systems MSB No. Requirement: To prevent loss of engine power due ⦠* DCA/LYC/224A Lycoming Parallel Valve Cylinder and Head Assemblies â Inspection Applicability: All Lycoming engines fitted with p. arallel valve cylinder and head assemblies listed in Table 1 of Lycoming Mandatory Service Bulletin (MSB) 634, dated 11 October 2018, or later FAA approved revision. ... SB-634 Cylinder Retirement (pdf) Download. Service Instructions - Operational. 501B (Supersedes Service Bulletin No. Downlad Service Bulletin No. 634, dated October 11, 2018, or later revision. 1 Alphabetical Listing of Lycoming Service Bulletins, Letters, and Instructions * - Lycoming ... (A.D. #62-03-02) S.I. 634 lists the population of affected cylinders and head assemblies, identifies symptoms, and cautions not to repair, refurbish, or overhaul the affected cylinder and head assemblies. Note: DCA/LYC/224A revised to introduce a repetitive . 634 Cylinder and Head Assembly Serviceable Life S.B. Read the entire SAIB by clicking here. Lycoming MSB No. Next youâre going to need Service Bulletin No. Service Bulletins (published since April 1960) describe mandatory procedures that must be observed for safety reasons, and readily identified by the mandatory heading printed SB-240W Mandatory Parts Replacement at Overhaul (pdf) Download. Note: 1299B Cushion and Magneto Drive Gear Modification S.L. 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