What happened
On 19 July 1998, a Beechcraft Sierra C 24 R, registration N3711B, attempted a takeoff from runway 06 at Varberg-Getterön Airport in Sweden. Following a period of heavy rainfall, the grass runway was notably soft and saturated in several areas.
As the aircraft accelerated, it reached a height of approximately ten meters before descending. The aircraft bounced several times along the runway surface and eventually came to rest in a marsh located 180 meters beyond the runway end. The pilot and one passenger were uninjured, though the aircraft sustained substantial damage, including a sheared nose gear and damage to the engine mount and propeller.
The investigation
The Swedish Accident Investigation Authority (SHK) examined the aircraft's engine, fuel system, and takeoff performance. Technical inspections of the Lycoming engine and fuel injectors revealed no defects capable of preventing the engine from developing full thrust. While the pilot reported a sensation of insufficient power, investigators found the engine and propeller systems to be airworthy.
Investigators also analyzed the runway conditions and the pilot's configuration. The takeoff performance calculations indicated that while the aircraft was under its maximum certified weight, the actual takeoff distance was longer than expected for the given conditions. Witnesses observed that the pilot applied full nose-up elevator from the beginning of the takeoff roll.
Findings
- The aircraft was airworthy and no mechanical engine failure was identified.
- The grass runway surface was unusually soft and drenched due to recent heavy rain, which increased rolling resistance.
- The pilot utilized a 10-degree flap setting instead of the 15 degrees recommended in the operating manual.
- The application of full nose-up elevator during the takeoff roll increased induced drag and hindered acceleration.
- The aircraft failed to develop sufficient lift to remain airborne once it exited ground effect.