Squawk Box

June 2017 Issue

Pushrods

The following information is derived from the FAA’s Service Difficulty Reports and Aviation Maintenance Alerts.

The number 3 cylinder exhaust pushrod broke, due to a valve stuck in the closed position. The valve was not stuck at the time of the investigation. No marks were seen on the top of the piston as viewed through a borescope. The lifter came apart as a result of the broken push rod but appears to have been operating properly prior to the event.

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