20110817021099A

On August 17, 2011, at approximately 15:42CDT, N46TB, a Piper PA-31-310, serial number 31-67, was operated by the owner, who holds an FAA private pilot certificate and a third class medical certificate. The accident occurred as the aircraft was taxing for takeoff on runway 19 at the Perryton ochiltree county airport, in Perryton, Texas (kpyx). The proposed flight was under visual flight rules and no flight plan was filed. The airman received a standard pilot briefing from the Lockheed martin automated flight service station prior to the proposed flight. The pilot was holding short of runway 19 in a westerly direction and the power was advanced to perform an engine run-up check prior to taking off. The pilot stated as the power was increased to 1500 RPM, he heard and felt an explosion from underneath the floor below the pilot seats. The force of the blast pushed him upward toward the ceiling. He tried to exit by breaking the window adjacent to the pilot but was unsuccessful. The pilot was apparently able to evacuate the aircraft through the aft entry door despite the reported flames in the cabin. The cabin windows were blown out and the upper clam shell door was blown from the hinges and was found an estimated 75 feet north of the aircraft. The pilot did not shut down the engines prior to exiting the aircraft. The aircraft veered to the right and proceeded north bound into the grass and stopped an estimated 400 feet form the end of runway 19. The aircraft stopped due to soft soil near an agriculture field adjacent to the airport. The aircraft continued to burn and was entirely engulfed in flames.