P/N: AB-357584K

Magneto Distributor Gear Assemblies

Hartzell magneto distributor gear assemblies AB-357584K and AB-357586K are approved replacement components for Bendix Magnetos. 

SB643D specifies that certain magneto distributor gears must be replaced at the next 500-hour inspection interval, regardless of their observed condition. While standard maintenance practices often rely on inspection-based (“on-condition”) replacement, this requirement reflects known wear characteristics and legacy design considerations associated with earlier gear configurations.

Continental Motors has determined that these gears may be susceptible to hidden deterioration or fatigue not detectable through routine visual inspection and therefore mandates proactive replacement to ensure continued ignition system reliability. Compliance at the 500-hour inspection is required even if the gear appears serviceable, aligning with the bulletin’s emphasis on preventing in-service failure of critical rotating components.