Aircraft Magneto Service
Service Bulletin SB658
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The following pictures are gear holding tools and the damage they cause.

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The gear holding tool stresses the nylon gear causing it to fail. The picture below is a Bendix D3000 series dual magneto distibutor block and gears with missing gear teeth. The teeth, the tool stressed, broke off. The result was a complete failure of the magneto.  Notice that the broken teeth were located where the magneto would be installed at its timing position.

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