Incident Details
During an instructional flight, the student pilot, who had accumulated a total of 5 flight hours, attempted to land with the flaps extended to the 20-degree position. The aircraft ballooned during the landing attempt, prompting the certified flight instructor (CFI) to take control. The CFI elected to continue the landing rather than abort.
Runway Overrun
Insufficient runway remained for the landing to be completed safely. The aircraft overran the end of the runway, traversed a drainage ditch, and collided with a fence.
CFI Report
The CFI reported that the aircraft was mechanically in proper working condition. He further stated that he was unaware of the effect that removing the 20 degrees of flaps would have on the aircraft's stopping distance, and therefore left the flaps extended during the landing.