Accident Sequence
During the landing roll, the airplane began to veer to the left. The pilot applied right rudder and right brake in an attempt to correct the deviation. Despite these inputs, the airplane continued to veer left. The pilot then applied maximum braking, and the airplane nosed over.
Aircraft Examination
Examination of the airplane after the accident revealed that the battery had been relocated from its original position at the rear of the airplane to a location underneath the instrument panel. This relocation was performed in accordance with a Supplemental Type Certificate (STC). The examination found that the battery cable could come into contact with the left rudder pedal and brake when the right rudder pedal was applied. This contact caused the application of uncommanded left brake pressure.
Probable Cause
The investigation determined that the battery cable contacting the left rudder pedal and brake when the right rudder pedal was applied led to uncommanded left brake pressure, which contributed to the loss of directional control during landing.