Supersedes Service Instruction No. 1508B
February 10, 2011
All Lycoming engines with dual magnetos
TIME OF COMPLIANCE
At the next oil change, not to exceed 50 hours of engine operation or at each magneto timing check or service
This Service Instruction identifies the necessary steps to install new clamps on dual magnetos to securely attach a Teledyne/Bendix or other dual magneto to a Lycoming engine. The clamp installation procedure in this Service Instruction is mandatory. Compliance and record thereof in the engine logbook are necessary unless the new clamps P/N 66M19385 have already been installed and recorded as such in the engine logbook. Failure to comply with this Service Instruction can cause loss of engine power.
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