What happened
On August 7, 2014, at approximately 19:00 local time, a Piper PA-28R-201, registration HB-PQY, was performing a private VFR takeoff from runway 34 at Beromünster airfield. The aircraft was configured for a short-field takeoff and was carrying three occupants. After a full-power takeoff roll, the aircraft briefly lifted off at a speed between 55 and 60 knots while approximately three-quarters to four-fifths down the runway. However, the aircraft failed to sustain flight and settled back onto the runway.
Recognizing the insufficient remaining runway length, the pilot immediately aborted the takeoff by applying idle power and maximum braking. The aircraft continued to roll past the end of the runway, veered slightly to the right, and came to a stop in a grassy area adjacent to the runway. During the final moments of the excursion, the landing gear collapsed. The incident resulted in one person seriously injured and two others with minor or no injuries.
The investigation
Investigators from the SUST examined the wreckage and analyzed digital data from the aircraft's Avidyne primary flight display (PFD) and multi-function display (MFD). Additionally, data from the Flarm collision warning system was reviewed. The technical examination of the engine and the flight data confirmed that the engine was producing full power during the takeoff roll, and no mechanical failures were identified as contributing to the event.
Findings
- The investigation established that the aircraft was overweight at the time of the accident. The maximum allowable takeoff mass was 2750 lb, but the aircraft weighed 2808 lb.
- The center of gravity was measured at 91.3 inches, which was within the permitted range of 82 to 91.5 inches.
- There were no technical or engine-related causes for the failure to maintain flight.