The excessive pressure in the brake system resulting from heating of the recently serviced hydraulic fluid in the brake master cylinders, and the resultant locked brakes and inability to maintain directional control of the airplane.
— NTSB Determination
The 29-inch tundra tire equipped airplane was being landed on a wet, sandy, gravel bar. The pilot stated that the back seat heater had been blowing hot air on the brake master cylinders, which had just been serviced. At touchdown, the airplane began to nose over. The pilot attempted to add power and keep the tail down with airflow, but the airplane continued over onto its back. Skid marks were measured for 154 feet from the touchdown point.
The 29-inch tundra tire equipped airplane was being landed on a wet, sandy, gravel bar. The pilot stated that the back seat heater had been blowing hot air on the brake master cylinders, which had just been serviced. At touchdown, the airplane began to nose over. The pilot attempted to add power and keep the tail…
The accident on 1997-09-13 involved a Piper PA-18-150, registration N7054, at Saint Mary's, AK.
The excessive pressure in the brake system resulting from heating of the recently serviced hydraulic fluid in the brake master cylinders, and the resultant locked brakes and inability to maintain directional control of the airplane.
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