Important Notice: New Mandatory Lycoming Bulletin (MSB 667A)
On March 12, 2026, Lycoming Engines released Revision A of Mandatory Service Bulletin 667A, concerning the replacement of certain piston pins. What is this about? Lycoming determined that certain thin-wall piston pins (P/N LW-13445) installed in engines, sold as spares, or supplied in specified cylinder kits with an 8130-3 date between January 7, 2021 and […]
