1. Troubleshot engine roughness. Checked engine and found spark plugs full of carbon deposit. Cleaned, re-gapped and tested all spark plugs as required.
2. Ran engine and checked for leaks and verified its performance.
All maintenance performed on this engine was conducted in reference with Lycoming Operator's Manual Model O-320 Series as revised, and the ccurrent regulations of the Federal Aviation Administration and is approved for return to service with respect to the work performed.