Narrative:

At the completion of an otherwise normal local flight in my rv-8 aircraft; approximately early afternoon; I had a landing incident on runway xx at ZZZ airport. After a normal touchdown for a wheel landing; the aircraft slowed and the tail wheel came down normally. With the landing assured; I began to brake the aircraft and as soon as pressure was applied; the left brake completely locked. Due to the left brake locking; the airplane came around to the left. I applied opposite (right) rudder and brakes to try and stop the rotation; but the right brake then locked causing the airplane to nose over and come to rest on the spinner. I subsequently determined the cause of the locked brakes to be activation of the aircraft parking brake valve. This activation was caused by the sheath of the parking brake actuator cable slipping in a clamp allowing the valve to actuate on its own. To prevent this in the future; I plan to remove the parking brake system; which is rarely; if ever; needed on this class of aircraft. Otherwise; careful inspection and maintenance of the actuator for any parking brake. [Recommend] a positive locking system or other visual means of identifying that a parking brake is actuated prior to landing could have prevented this situation. Damage to the aircraft includes: prop blades and spinner destroyed. Engine requires prop strike inspection. Damaged wheel pants. Minor structural deformation of the left gear tower and skins.

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Original NASA ASRS Text

Title: Pilot reports the left brake completely locked on his Van's RV-8 aircraft during landing rollout; followed by the right brake locking when he applied right rudder and brakes. The aircraft nosed over and came to rest on the spinner. Parking Brake Valve had actuated; caused by the sheath of the Parking Brake Actuator cable slipping in a clamp; allowing the valve to actuate on its own.

Narrative: At the completion of an otherwise normal local flight in my RV-8 aircraft; approximately early afternoon; I had a landing incident on Runway XX at ZZZ airport. After a normal touchdown for a wheel landing; the aircraft slowed and the tail wheel came down normally. With the landing assured; I began to brake the aircraft and as soon as pressure was applied; the left brake completely locked. Due to the left brake locking; the airplane came around to the left. I applied opposite (right) rudder and brakes to try and stop the rotation; but the right brake then locked causing the airplane to nose over and come to rest on the spinner. I subsequently determined the cause of the locked brakes to be activation of the aircraft Parking Brake Valve. This activation was caused by the sheath of the Parking Brake Actuator cable slipping in a clamp allowing the valve to actuate on its own. To prevent this in the future; I plan to remove the Parking Brake System; which is rarely; if ever; needed on this class of aircraft. Otherwise; careful inspection and maintenance of the actuator for any parking brake. [Recommend] a positive locking system or other visual means of identifying that a parking brake is actuated prior to landing could have prevented this situation. Damage to the aircraft includes: prop blades and spinner destroyed. Engine requires Prop Strike Inspection. Damaged wheel pants. Minor structural deformation of the left gear tower and skins.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.