Service Instruction No. 1508 C

Supersedes Service Instruction No. 1508B

February 10, 2011 

MODELS AFFECTED

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.