What happened
During the takeoff roll, the pilot proceeded with a lengthy taxi from the ramp to the runway threshold while the parking brake remained partially engaged. As the aircraft accelerated, the friction caused the braking components to overheat and expand significantly. After traveling approximately 3,000 feet, the brakes seized to such an extent that the main gear tires began leaving skid marks on the pavement. The aircraft failed to reach flying speed and traveled a total of 3,168 feet before exiting the runway end.
Following the excursion from the paved surface, the aircraft descended a hill and collided with trees, rocks, and a fire hydrant. The impact and subsequent events resulted in the destruction of the aircraft. While the pilot sustained serious injuries, they were able to escape the wreckage.
Findings
Investigation into the incident revealed that a specific design characteristic allowed the parking brake handle to be moved to the released position even if the brakes had not been fully disengaged, creating a false sense of security for the crew. Additionally, the main gear tires were found to be in a heavily worn, nearly slick condition at the time of the accident. The intense heat generated during the failed takeoff roll was sufficient to destroy both main gear brake components.
Contributing factors included several operational errors by the pilot in command:
- Failure to achieve necessary airspeed for flight
- Inadequate preflight inspection
- Non-compliance with established procedures and directives
- Improper use of powerplant controls
- A delayed decision to abort the takeoff roll