Incident Overview
A pilot experienced a landing incident at Hailey after a previous landing on a plowed runway with hard-packed snow and ice. The pilot believed that during taxi for turnaround at the end of the runway, the right-hand brake became hydraulically locked because the parking brake mechanism on that side engaged, even though the parking brake handle was never pulled. The takeoff from the icy runway seemed normal, and the pilot was unaware of the locked brake condition at that time.
Landing Sequence
Upon touchdown at Hailey, the airplane immediately veered violently to the right. The brake remained locked, causing the airplane to swerve to the right before nosing over.
Investigation Findings
Investigation determined that the parking brake locking lever on the right brake cylinder was in its overcenter position, which locked the brake. The pilot reported that at no time was the parking brake handle pulled, indicating the locking lever may have been inadvertently engaged without the handle being activated.
Probable Cause
The parking brake locking lever on the right brake cylinder was in its overcenter position, locking the brake.