Porsche Scheduled Maintenance Plan. Porsche Scheduled Maintenance Program 2014 PPN 4/16/2015 9:44 AM Page 1. The Porsche Scheduled Maintenance Plan: An ownership experience to match the. driving experience. Now that you have selected your new Porsche, we are sure you. will want to give it the finest care. The Porsche Scheduled Mainte -. nance Plan (PSMP) allows you to manage your factory recom -.