This October 2008 accident report is provided by the National Transportation Safety Board. Published as an educational tool, it is intended to help pilots learn from the misfortunes of others.
Aircraft: Vans RV-8A, Vans RV-6A. Injuries: None. Location: Cambridge, Maryland. Aircraft damage: Substantial.
What reportedly happened: Following an uneventful flight and landing at the destination, the RV-6A was following the RV-8A to the parking area. The RV-8A parked first. The pilot of the RV-6A planned to park his airplane immediately to the right of the RV-8A. As the RV-6A pilot maneuvered to park he applied right brake to help turn the airplane. The brake failed and the right wing and propeller of the RV-6A struck the other airplane.
Examination of the o-ring between the main brake housing and the piston on the right wheel brake assembly revealed that the o-ring had deteriorated due to damage induced by excessive heat.
Probable cause: The failure of the RV-6A’s right brake assembly o-ring due to excessive heat.
For more information: NTSB.gov