Background
Knockbain Farm Airstrip features a 650 m long, 15 m wide grass runway oriented 08/26. The runway has a 6% upslope for the first 100 m, a level section of about 100 m, and then a 3% downslope for the remaining 450 m. A slight downslope leads from the runway to the apron area, which is on the north side about 40 m from the runway centreline. Weather at the time was CAVOK with a light southerly wind. The grass surface was wet from previous rain.
Accident
On 23 June 2010 at 0645 hrs, the pilot of G-WEFR, a Pioneer 200-M, decided to land on Runway 26. The aircraft touched down on the level section, then veered off the right side of the runway about 200 m from the end. It struck two parked, unmanned aircraft on the apron: G-VORN and G-ZZAC, both Aerotechnik EV-97 Eurostars. The collision occurred at an estimated speed of 15-20 mph before G-WEFR came to a stop.
Injuries and Damage
The pilot of G-WEFR initially appeared uninjured, but later was diagnosed with broken ribs, classified as a serious injury. The aircraft sustained damage to its left wing, propeller, and fuselage. G-VORN suffered damage to its propeller, cowling, and left wing. G-ZZAC had damage to its right wing.
Investigation
The pilot submitted an Aircraft Accident Report Form. The pilot concluded that the loss of control after landing was due to the downslope on the runway and the wet grass conditions.