What happened
On September 9, 2022, at approximately 07:50 central daylight time, a Piper PA32RT-300T, registration N31981, was involved in an accident near Bulverde, Texas. The flight was being operated under 14 CFR Part 91 for personal use.
During takeoff from Bulverde Airpark (1TT8), the pilot observed that the aircraft failed to accelerate as expected. Fearing that the aircraft would not stop before reaching a fence and vehicles at the runway end, the pilot continued the takeoff roll. While the aircraft successfully cleared powerlines, trees, and a school, the pilot noted the plane was approaching a stall condition. Consequently, the pilot performed a forced landing into a field. During the landing sequence, the aircraft struck a tree, causing substantial damage to the fuselage and the right wing. The pilot and passenger were not injured.
The investigation
Post-accident inspection of the engine revealed significant issues within the No. 4 cylinder. Investigators found excessive carbon deposits on the exhaust valve, rocker arm, rocker shaft, and valve spring. The rotator cap showed carbon buildup and a groove wear pattern indicating a lack of rotation. Additionally, the exhaust valve guide exhibited excessive movement and wobble. The No. 5 exhaust valve also showed signs of carbon buildup, though less severe than the No. 4 cylinder. No other issues were identified in the airframe or engine.