During a scheduled 100 hour inspection, maintenance personnel discovered structural damage to the airplane’s firewall. According to the flight school’s records, there were 77 flights in the accident airplane from the previous 100 hour inspection that took place on May 8, 2012 and July 18, 2012, when the damage was discovered. A total of 91.4 flight hours were accumulated between those inspections. The flight school was never notified of an event that would have possibly caused the firewall damage. The actual time and date of the accident is unknown.