Incident
During the landing roll, the pilot reported that the right brake was ineffective. The copilot attempted to use her brakes but confirmed the same problem. The runway length was relatively short, the density altitude was high due to ambient conditions, and the aircraft was carrying a full passenger load. The crew decided not to attempt a go-around. The last segment of the runway sloped downhill, which made deceleration more challenging. The aircraft subsequently veered off the left side of the runway, continued down a slope, and received substantial damage.
Investigation Findings
Post-incident examination of the braking system focused on the right main brake assembly. The brake linings, Cleveland part number 6630, were found to be worn past the retaining rivets and into the metal caliper. The O-ring piston seal had its edge protruding past the cylinder lip and was broken. No hydraulic fluid remained in the cylinder. The aircraft had been operated for approximately 129 hours since the installation of new brake linings, indicating the wear occurred relatively quickly.