Parts and components.

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

UNISON UREM40E Defective Spark Plugs

During the installation and operational check of two new Unison/ Slick magnetos--plus harness and eight spark plugs--to correct a hard starting discrepancy, the engine had a 200-300 RPM magneto drop on the left magneto.

Troubleshooting determined one of the eight new spark plugs (p/n UREM40E) was defective. Once the defective plug was replaced with a known good plug, the engine's operational check was good.

Part Total Time: 0 hours.

PIPER PA28-161 Broken Throttle Cable

The …