What happened
The aircraft departed from the end of runway D while attempting to land. Environmental conditions at the time were characterized by light and variable winds, eventually becoming calm. The pilot attempted to slow the aircraft using aerodynamic braking techniques but determined that it was too late to initiate a go-around maneuver. Upon applying the wheel brakes, the pilot noted that they felt spongy and provided little to no stopping power.
The investigation
Following the incident, a qualified mechanic conducted an examination of the aircraft's braking system. The inspection revealed that the right brake assembly had suffered a mechanical failure, which explained the lack of braking effectiveness reported by the pilot during the landing roll.
Findings
The primary factor contributing to the runway excursion was the right brake assembly failure. This mechanical defect rendered the braking system ineffective when needed most. The pilot's decision to continue the landing despite the initial signs of poor braking performance, combined with the late application of brakes, resulted in the aircraft running off the departure end of the runway.