What happened
The pilot performed a low pass over the airport prior to landing and observed that the windsock was limp, indicating very light or variable wind conditions. Based on this assessment, the pilot elected to land downhill to utilize any available tailwind component for reduced ground speed. Ten degrees of flaps were extended for the approach.
Touchdown occurred at an indicated airspeed of 60 knots, with the aircraft touching down between 750 and 1,000 feet beyond the runway threshold. During the initial rollout, the pilot reported that the brakes felt normal but began to fade shortly thereafter. Midway down the runway, the pilot selected full flaps and held the nose wheel off the ground in an attempt to improve braking efficiency. However, the pilot noted no increase in braking action despite these adjustments.
The aircraft continued past the end of the runway and departed into a ditch. A post-accident examination of the aircraft disclosed a severe overheat condition of the brake pads, which was consistent with the reported brake fade.
The investigation
Post-accament examination of the aircraft revealed a severe overheat condition of the brake pads. This mechanical failure was identified as the primary factor contributing to the loss of braking effectiveness during the critical rollout phase.
Findings
The investigation determined that the pilot's decision to land downhill, combined with the subsequent brake fade, led to the runway overrun. The overheated brakes were unable to provide sufficient deceleration to stop the aircraft within the remaining runway distance.