What happened
During the landing phase, the aircraft experienced a loss of control after the right brake failed to function. The pilot attempted to compensate for the asymmetrical braking by using the left brake and rudder input; however, the aircraft veered to the right and departed the runway. During the excursion, the plane struck a visual approach slope indicator light, causing substantial damage. Following the impact, a fire erupted, which was eventually extinguished by the pilot and airport personnel.
The investigation
The investigation focused on the braking system following the pilot's report that the right brake was inoperative. Records indicated that maintenance had been performed on the brakes twice within the previous two months, involving bleeding the lines and adding fluid. While the pilot reported no issues during a flight the day before, a post-accident inspection revealed that a seal in the brake master cylinder was defective.